US20010027564A1 - Television distribution system for signal substitution - Google Patents
Television distribution system for signal substitution Download PDFInfo
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- US20010027564A1 US20010027564A1 US09/875,476 US87547601A US2001027564A1 US 20010027564 A1 US20010027564 A1 US 20010027564A1 US 87547601 A US87547601 A US 87547601A US 2001027564 A1 US2001027564 A1 US 2001027564A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
- H04H20/103—Transmitter-side switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
- H04H60/33—Arrangements for monitoring the users' behaviour or opinions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/76—Wired systems
- H04H20/77—Wired systems using carrier waves
- H04H20/78—CATV [Community Antenna Television] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/61—Arrangements for services using the result of monitoring, identification or recognition covered by groups H04H60/29-H04H60/54
- H04H60/63—Arrangements for services using the result of monitoring, identification or recognition covered by groups H04H60/29-H04H60/54 for services of sales
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/61—Arrangements for services using the result of monitoring, identification or recognition covered by groups H04H60/29-H04H60/54
- H04H60/66—Arrangements for services using the result of monitoring, identification or recognition covered by groups H04H60/29-H04H60/54 for using the result on distributors' side
Definitions
- This invention relates generally to the accumulation of panelist response information and more particularly to the presentation of selected information to viewers of targeted television programming and the accumulation of responses from those viewers.
- the Eskin et al. system allows a different combination of panelists to be selected for each program substitution and has provided valuable marketing information.
- the system requires great expense in providing and maintaining sophisticated receiving stations in each panelist household.
- panelists at times resist the requirement for such receiving stations in addition to their VCRs and cable television distribution and decoder boxes which already connect to their televisions.
- the target community is divided into a significant plurality of zones of coverage.
- the number of zones is 24.
- the cable head end produces a small plurality of distribution trunks conveying normal and substitute channel signals in a cable television distribution spectrum.
- Each distribution trunk is split into a plurality of cable television signal feeds which convey substantially identical signals to their source distribution trunk.
- Each zone receives a cable television feed signal from the cable television head end, which feed signal is distributed to the viewer households of its respective zone.
- the market research firm prior to connection of feed signals to the zones, determines from information provided by volunteer panelists, which combination of zones throughout the community will demographically reflect the community as a whole or reflect a desirable attribute of the community.
- the zones are selected and connected by cable signal feeds to one of the distribution trunks of the cable head end.
- the cable television head end equipment in conjunction with equipment provided by the market research firm, from time to time produces at least one distribution trunk television signal spectrum having at least one substitute channel signal and at least one distribution trunk television signal spectrum having channel signals not including the substitute channel signal.
- a normal spectrum is distributed to some zones while a substituted spectrum may be delivered to other zones.
- a market research computer system stores the associations of panelists with the particular distribution trunks from which each panelist receives signals and analyzes panelists' shopping behavior based on the signals presented to panelists' zones.
- Each panelist in the study is assigned a panelist identification which may be in the form of a panelist identity card.
- the panelist identification is associated with the information identifying the goods purchased and forwarded to a market research computer system.
- the market research firm collects the associated panelist-purchased goods information in the market research computer system which has previously been informed of which panelists are served by which zones and which zones have been provided a television spectrum signal feed including normal and substitute channel spectrums. Marketing information can then be generated based on the purchases of panelists which did and did not receive the substitute channel programming.
- the panelist responses may be obtained without any conscious action by the panelists. More particularly, in one embodiment all the panelists need do is provide initial demographic data and to identify themselves at the time of purchase of products. Otherwise they act entirely in accordance with their usual practices. Such identification might occur, for example, when the panelist uses his or her credit card for the purchase. More particularly, for grocery products at least, universal product coding (UPC) has become common.
- each panelist is provided with a panelist identification card having a scannable identification thereon which is recorded in a market research computer system to correspond with the particular cable signal feed and thus which programming the panelist has reviewed.
- the identification card is presented to the cooperating retail stores where he or she shops, where the card is scanned by a UPC product scanner along with the scanning of purchased products.
- the work load of the panelist is reduced merely to presenting his identification card.
- Data capture is electronic and automatic, both for the product and for the panelist identification. The panelist never needs to record anything. All data are recorded by the UPC scanner.
- the information obtained by the scanner is transmitted by the retail store to a market research computer system for association and correlation of the data with the advertisements sent out to the respective panelists. That is, the signals transmitted to the respective panelists are identified as the signals sent out by the cable television head end, and the responses of the respective panelists are noted by the scanning units of retail stores and transmitted back to the market research computer for association and correlation.
- a second embodiment of panelist purchase data collection may also be employed.
- the panelists regularly report to the marketing research computer system their panelist identification and data regarding the purchases they have made.
- a panelist may be provided with a home UPC scanner which is used to record recent purchases.
- the purchase information and the panelist identity are stored in the home UPC scanner and transmitted to the market research computer system where they can be analyzed in the same manner as the retail store collected data.
- Many possible ways of data collection may be employed with the present system provided that the panelist identity and the products purchased are matched before market research analysis.
- the system of the present invention provides results drawn from selections of panelists in the community as a whole and does not merely represent an unscientifically selected one-half of the community as does the Wallerstein arrangement and does not require the expense and complications of the per-panelist-directed system of Eskin et al.
- panelist is used to represent the individuals in a particular household.
- normal is used herein to signify the messages, signals or programs provided by the operation of the television system in the absence of the substitution provided by the present invention. It thus may encompass all messages, signals or programs as may be provided in the normal course of television programming, including special messages, signals or programs transmitted and received over the usual channels to which the receivers are ordinarily tunable.
- program encompasses commercials and other special messages.
- FIG. 1 is a general block diagram showing a cable television head end constructed to deliver cable television signals, including substitute signals to a community divided into zones;
- FIG. 2 is a block diagram of a first embodiment of a cable television head end
- FIG. 3 shows an rf cable splitter and a plurality of fiber optic drivers
- FIG. 4 is a block diagram of a second embodiment of a cable television head end
- FIG. 5 shows an addressable switch bay used in the embodiment of FIG. 4.
- FIG. 6 is a block diagram of a third embodiment of a cable television head end.
- FIG. 1 is a general block diagram showing a targeted television system in accordance with the present invention for delivering cable television signals to a viewer community represented by irregular area 101 .
- Each of the zones represents an area of the community in which the cable television subscribers are served from a single cable feed such as cable feeds 109 and 111 .
- the zones will not be as regular as shown because they are determined by the cable television company based on the economics of providing cable services.
- Each zone includes a number of geographically proximate subscribers and is referred to herein as being substantially contiguous. Further, it is possible that over time the zone boundaries will change as new subscribers request cable service and other subscribers give up their prior service.
- Each zone e.g. 103 includes a signal distribution point such as 113 which receives the cable feed, e.g. 109 and distributes the cable TV spectrum of the cable feed by means well known in the art to the viewers in the zone.
- the spectrum of signals on a cable feed, e.g. 109 is provided by a cable head end 123 .
- Cable head end 123 includes a plurality of signal inputs 125 for receiving the normal TV channels from over-the-air broadcasts or satellites. It should be mentioned that the normal channels may also include programming which is provided by the cable TV operator, such as video tapes of community events.
- the sources of normal signals are signal inputs to a television channel connection apparatus 127 , as are a plurality of input signals 128 from a substitute channel signal source 129 .
- the channel connector 127 provides a plurality of normal TV channels to the substitute signal source 129 over a plurality of connections 131 .
- Substitute signal source 129 and connection apparatus 127 cooperate under the control of a computerized controller 135 to produce television signals for three distribution trunks 142 , 143 and 144 .
- Each of the distribution trunks 142 , 143 and 144 conveys a full spectrum of cable TV channels to a respective splitter/driver 137 which includes an 8-way signal splitter 126 and cable feed drivers, e.g.
- the television channel signals may be different on each of the distribution trunks 142 , 143 and 144 , so that the feeder cables 119 and 121 may be carrying normal and substitute channels while the feeder cables 117 and 115 of splitter/driver 139 and the feeder cables of splitter/driver 141 may convey only normal channels.
- a market research firm begins business in a community, the population is solicited to identify cable television subscribers who agree to participate as market survey panelists.
- panelists such volunteers provide the market researcher with demographic data comprising information about various types of personal and shopping behaviors.
- the volunteers may disclose the names and ages of individuals in the panelist's household, household income and likes and dislikes, as well as, the stores frequently shopped and the brands frequently purchased.
- the market researcher can determine the traits of the panelist for later use in analyzing market research data. Also based on the panelist-provided information, the market researcher determines which of the zones, e.g.
- each of the splitter/drivers 137 , 139 and 141 should be connected to which of the splitter/drivers 137 , 139 and 141 .
- the goal is to demographically select the interconnection between distribution trunks and zones so that each distribution trunk is connected to a “cross section” of the panelists in the community.
- the signal distribution point, e.g., 113 of each zone has been given a letter A, B or C which corresponds to the A, B or C letter assigned to the splitter/driver connected thereto.
- the connection apparatus 127 receives all channels of normal signals and substitute channel signals and combines the received channel signals onto the three distribution trunks 142 , 143 and 144 .
- each cable subscriber receives a spectrum of up to 60 different channels on the cable at their household.
- the channel signals from receivers 125 are properly channel modulated and combined as a distribution channel spectrum on all three distribution trunks 142 , 143 and 144 such that all three trunks convey the same signals.
- Each of the distribution trunks 142 , 143 and 144 feeds an associated eight-way splitter/driver 137 , 139 and 141 .
- the splitter/drivers comprise an eight-way rf splitter 126 , each output of which feeds a fiber optic driver 122 , 124 .
- the output signals of the splitter/drivers are then conveyed to connected distribution points, e.g. 151 and 152 , via feeder cables 119 and 121 .
- the distribution points convert the optical channel information back to rf for distribution to the subscribers in the zone.
- at least two distribution trunks and splitter/drivers are used so that a test group and a control group can be created. While the present embodiment uses three distribution trunks, some panelist response testing systems may use four or more distribution trunks and splitter/drivers. Also, the present embodiment uses fiber optic feeder cables; however, other types of feeder cables, such as rf coaxial cable, could be used.
- connection apparatus 127 When a new advertisement is to be tested it is installed at substitute signal source 129 and made available on a lead 128 as an input to the connection apparatus 127 . Under the control of controller 135 connection apparatus 127 replaces normal signals in a channel on one of the distribution trunks 142 , 143 and 144 with the new advertisement. When the substitution is made for distribution trunk 142 , the substitute signal is delivered to all subscribers, including all panelists, in zones A. Thus the panelists in zones A are the test group and the panelists in either zones B or zones C, which do not receive the new advertisement, may be chosen as a control group.
- FIG. 2 shows an embodiment of a cable head end which is equipped to provide channel substitution in the manner described above for a 60 channel distribution system.
- twelve channels may be subject to signal substitution, while the remaining 48 channels are not subject to signal substitution.
- the 12 substitutable channels are channels 2-13 while the other channels are 14-61.
- Other combinations of channels could easily be used.
- FIG. 2 includes forty-eight signal inputs 125 B which are shown as off-air antennas but could be satellite receivers or inputs resulting from local TV cameras or VTRs. Each signal input is at base band or is converted to base band by a respective demodulator of which demodulators 171 and 172 are shown.
- each demodulator is then modulated by a respective fixed channel modulator of which modulators 174 and 175 are shown.
- Each of the forty-eight modulators is tuned to a different output channel so that the outputs of all modulators 174 , 175 comprises the forty-eight channels 14-61.
- the output signals from each modulator are combined by a head end combiner 177 into a spectrum of channels 14-61.
- Combiner 177 splits the spectrum of channels 14-61 into three identical copies on outputs 179 , 180 and 181 which are each applied to a separate two-way combiner 183 , 184 and 185 .
- the other input to combiners 183 - 185 consists of channels 2-13, which are subject to signal substitution.
- the outputs of combiners 183 , 184 and 185 are the distribution trunks 142 , 143 and 144 , respectively.
- FIG. 2 includes twelve normal channel signal inputs 125 A which, as described below, are subject to being replaced by substitute channel signals through the use of a base band switch 187 .
- channel inputs 125 A are shown as off-air signals but other signal types may be used.
- Each channel input 125 A is demodulated to base band in a respective demodulator, e.g. 189 , 191 , which is connected via cables 192 as an input to base band switch 187 .
- Up to six substitute channels, at base band are also connected from the market researchers as inputs 193 to base band switch 187 .
- the substitute channels may also include test signals which can be switched back to the market researchers for equipment testing on outputs 194 .
- the base band signals switched back to the market researchers on conductors 194 may also include a selected normal channel so that the substitute source can be synchronized with the normal channel before channel substitution occurs.
- Base band switch 187 responds to control signals from controller 135 to selectively connect the inputs 192 and 193 to the outputs of the switch.
- the outputs of base band switch 187 comprise outputs 194 to the market researchers and outputs 195 which are used to complete the channel spectrum sent to subscribers via distribution trunks 142 - 144 .
- To provide a complete spectrum of channels 2-61 on each distribution trunk 142 - 144 three fixed channel modulators for each channel 2-13 are connected to outputs 195 of the base band switch 187 .
- modulators 161 , 162 and 163 for channel 2 are all shown connected to separate outputs 195 of base band switch 187 , as are modulators 168 , 169 and 170 for channel 13.
- Three combiners 197 , 198 and 199 are used to generate three channel 2-13 distribution spectrums which are respectively connected as inputs to the two-way combiners 183 , 184 and 185 .
- Each combiner 197 - 199 receives twelve channel inputs, one for each of the channels 2-13.
- combiner 197 is connected to channel 2 modulator 161 , channel 13 modulator 168 and to one modulator (not shown) for each channel 3-12.
- the distribution trunks 142 - 144 have a channel spectrum from channel 2 to channel 61 and the content of channels 14-61 is taken substantially directly from inputs 125 B and the continent of channels 2-13 is taken from switch 187 .
- the cable service provider or the market researchers instruct switch 187 , by means of controller 135 , to connect each input signal 125 A to all three of the modulators, e.g. 161 , 162 and 163 , for that input signal.
- the modulators e.g. 161 , 162 and 163
- all cable subscribers will receive all normal channels 2-61 from their connected distribution trunks 142 - 144 .
- the market researchers control switch 187 to connect the normal channel 2 signal to the market researchers via paths 194 as well to the three channel 2 modulators 161 , 162 and 163 .
- the market researchers obtain synchronism information for channel 2 from the channel 2 signal which they receive on path 194 .
- the market researchers send the substitute new advertisement to an input, e.g. 193 a , of switch 187 which is controlled to connect the input 193 a receiving the substitute signal to the output connected to modulator 161 .
- the exact moment of substitution is determined from the synchronism information received from normal channel 2, as is well known in the art.
- the substitute advertisement is being input to switch 187 it is fed on channel 2 to all subscribers, including panelists, connected to distribution trunk 142 . Those panelists connected to distribution trunks 143 and 144 continue to receive normal channel 2 signals from inputs 125 A.
- switch 187 is controlled to disconnect input 193 a and to connect the channel 2 input signal directly from input 125 A to modulator 161 .
- the substitution signals are sent to approximately one-third of the cable subscribers. Given the demographic selection of which zones are connected to the distribution trunks, a proper test group of panelists has received the substitute signals. Similarly, the panelists connected to distribution trunks 143 and 144 have received the normal signals and can form the control group.
- FIG. 2 shows a market research computer system 145 which is connected to the market research organization, the scan networks 159 of local retail stores, to the telephone network 160 for other panelist information and to the controller 135 .
- the market research computer system which may comprise multiple computers, stores lists of the panelists connected to each of the distribution trunks 142 - 144 . During signal substitution it is informed by the researchers, on which trunk the substitute commercial was carried. The market research computer system 145 can use this information to evaluate panelist data collected at local retail stores.
- base band switch 187 has been shown to include 12 input signal 125 A ports and 6 substitute signal input ports as well as 36 channel output ports and a plurality of market research output ports 194 . It should be mentioned that other combinations of substitute and normal signal inputs and other numbers of channel output ports 195 can be used. Although a larger base band switch 187 would be needed, the system of FIG. 2 could include, for example, 18 input sources 125 A, and 9 substitute sources 193 . Such a system would require 54 (3 ⁇ 18) output ports 195 , each with a fixed channel modulator such as modulator 170 .
- FIG. 4 shows a block diagram of a cable head end system which may be used as an alternative to the cable head end system of FIG. 2.
- the system of FIG. 4 provides the three distribution trunks 142 - 144 each conveying a spectrum of 60 cable TV channels.
- the signals of any of the 60 channels may be substituted in the manner described below.
- 60 input signal sources 125 are used in the system to provide signals for all channels. Although the input signal sources are shown as off air antennas, they may be cable feeds, satellite receivers or VTRs, as is common in the provision of cable TV services.
- the input signals from sources 125 are demodulated ( 171 , 172 ) if received at rf, and each is modulated to the frequency of a unique one of the 60 channels 2-61 in respective modulators. Of the 60 modulators, only two are specifically shown, e.g., 173 , 175 .
- the output of each modulator, e.g. 173 is applied as an input to a four-way splitter, e.g. 201 , 203 . Accordingly, 60 four-way splitters 201 , 203 are present in the system.
- One of the outputs of each four-way splitter is connected by rf cable to a channel group combiner 208 .
- cable 205 connects four-way splitter 203 to group combiner 208 and cable 206 connects four-way splitter 201 to the channel group combiner.
- a broad vertical line 240 represents a bundle of individual coaxial cables, each conveying one modulated channel.
- the channel group combiner 208 thus receives 60 rf cables each conveying signals from one of the input signal sources 125 in a unique television channel.
- a plurality of cable channel combiners (not shown), as are well known in the art, make up combiner 208 which combines all received channels onto a single 60 channel spectrum on an rf coaxial cable 209 .
- a signal splitter 211 receives the channel spectrum on cable 209 and splits the spectrum into a plurality of identical copies. As will be seen, the number of copies represents the number of channels on which signal substitution can be simultaneously occurring.
- the present embodiment allows 6 channels to be simultaneously substituted, which results in splitter 211 being an eight-way splitter with two outputs unconnected.
- Each of the six active outputs of splitter 211 is connected to a frequency agile demodulator (FAD) of which 213 and 215 are shown in FIG. 4.
- the frequency agile demodulators receive control signals from controller 135 , via a control bus 235 , which determine the particular television channel they are to receive and demodulate.
- demodulator 213 may receive from controller 135 signals defining channel 2 and demodulator 215 may receive signals defining channel 17. Thereafter, demodulators 213 and 215 demodulate the signals in channels 2 and 17 of cable 209 , respectively, and apply the resulting base band signals as inputs to a video switch 217 .
- video switch 217 is a twelve input by twelve output switch which connects signals at the input ports to output ports defined by controller 135 .
- Six input ports are connected to the base band output signals of the frequency agile demodulators 213 , 215 and six inputs are connected to base band signals from six substitute signal sources, of which sources 219 and 221 are specifically shown in FIG. 4.
- Six of the twelve output ports of video switches 217 are connected to frequency agile modulators (FAM) of which frequency agile modulators 223 and 225 are shown.
- FAM frequency agile modulators
- the remaining six outputs of video switch 217 are connected by leads 226 as inputs to a vertical blanking internal (VBI) timing unit 227 .
- VBI vertical blanking internal
- VBI unit 227 identifies timing information, including vertical blanking information, from each signal on leads 226 and is interrogated from time to time by controller 135 . On the basis of the synchronizing information, switching can be commanded by controller 135 during the vertical blanking interval.
- Frequency agile modulators 223 , 225 respond to commands received from controller 135 via bus 235 to modulate base band signals received from video switch 217 to a television channel identified in the command from the controller. For example, frequency agile modulator 223 may be commanded to generate output signals modulated to channel 2 and frequency agile modulator 225 may be commanded to generate output signals modulated to channel 17. When output signals in another channel, e.g. channel 9, are needed, new commands are sent to an available modulator, e.g. 213 , to change its modulation frequency to channel 9. The output of each frequency agile modulator is applied to respective three-way splitter of which three-way splitters 237 and 238 are shown connected to modulators 223 and 225 , respectively.
- FIG. 4 includes three switched combiners 245 , 246 and 247 , each of which is connected to receive an input cable from all 60 four-way splitters 201 , 203 representing input signals and is connected to the three-way splitters 237 , 238 conveying channels modulated by the frequency agile modulators 223 and 225 .
- each switched combiner 245 , 246 and 247 is connected to ⁇ 66 coaxial cables, each conveying signals modulated to one cable TV channel.
- Each switched combiner comprises 6 addressable switch bays 250 , each comprising 12 single pole, single throw rf switches labeled J 1 -J 12 in FIG. 5.
- the switch bay also includes an address decoder with a manually settable address 251 and a connection 253 to the control bus 235 .
- the address decoder responds to address commands from controller 135 by turning one of the switches J 1 -J 12 on or off as specified in the command. After a command to enter a state, a switch remains in that state until commanded to change state.
- the outputs of the switches J 1 -J 12 are connected as inputs to a plurality of rf combiners which are connected to produce a spectrum of TV channels 2-61 on a distribution trunk, e.g. 142 . As shown in FIG. 4, the switched combiners 245 , 246 and 247 generate a spectrum of TV channels on distribution trunks 142 , 143 and 144 , respectively.
- switched combiner 245 receives addressed commands from controller 135 to turn on all 60 switches connecting the input signal sources 125 , via their respective channel modulators, to the distribution trunk. The other switches of switched combiner 245 are turned off.
- switched combiner 245 is commanded to switch the given channel from input signals 125 off and the substitute signal from video switch 217 (in the given channel) on. Controller 135 performs such switching on and off during the vertical blanking interval as identified by vertical blanking interval timing unit 227 .
- controller 135 sends to an available frequency agile demodulator, e.g. 215 , a command specifying channel 17 and sends to an available frequency agile modulator, e.g. 225 , a command also specifying channel 17. Controller 135 also sends to video switch 217 a command directing that the switch input of frequency agile demodulator 215 be switched to the switch output of frequency agile modulator 225 .
- channel 17 is delivered to the subscribers connected to distribution trunks 143 and 144 directly from the input source 125 and channel 17 is delivered to the subscribers connected to distribution trunk 142 via the channel group combiner 208 and video switch 217 .
- substitute signal source e.g. 219
- controller 135 commands video switch 217 to connect the switch input of signal source 219 to the output connected to frequency agile modulator 225 .
- frequency agile demodulator 215 and frequency agile modulator 225 is broken. This removes the normal signals from channel 17 on distribution trunk 142 and replaces them with the substitute signals from source 219 .
- the substitute signal from source 219 will be available on distribution trunk 142 .
- the video switch 217 is commanded to reconnect frequency agile demodulator 215 to frequency agile modulator 225 so that the continuing normal signal of channel 17 will be connected to distribution trunk 412 .
- switched combiner 245 is commanded to turn off the channel 17 connection from the video switch 217 and to turn on the channel 17 signal from the input sources 125 .
- FIG. 6 which comprises an alternative embodiment for the cable head end, is largely the same as FIG. 4.
- each switched combiner 245 , 246 and 247 is directly connected to two of the frequency agile modulators, e.g. 223 and 275 . That is, the output of each frequency agile modulator is not split into three copies and applied to all switched combiners as is done in the embodiment of FIG. 4.
- only two channels can be simultaneously substituted on each of the distribution trunks 142 , 143 and 144 and, when a signal is to be substituted on each of the distribution trunks 142 , 143 and 144 , a switch path must be set up through video switch 217 to a frequency agile modulator, e.g. 223 , 225 and 276 connected to the distribution trunk.
- FIG. 6 includes signal sampling and amplitude control apparatus to correct signal level mis-matches.
- Signal levels and gains throughout the system are controlled by fixed means so that the signal levels from four-way splitters 201 and 203 are lower than the signal levels from frequency agile modulators 223 , 225 and 275 - 278 .
- An electronically controlled attenuator 268 - 273 serially connects the output signals from the frequency agile modulators to their respective switched combiners 245 - 247 . Control for the attenuators 260 - 273 is sent by controller 135 .
- each distribution trunk 142 - 144 are split by splitters 283 - 285 , respectively, and communicated to a selector 294 which also receives signals representing the outputs of attenuators 268 - 273 which are taken by a plurality of splitters 291 - 286 , respectively.
- Selector 294 comprises a selector switch having 9 inputs, one from each splitter 283 - 291 , and one output 295 .
- a carrier measurement unit which includes a controllable tuner and a carrier amplitude measurement unit (not shown), is connected to the output 295 of selector 294 .
- controller 135 directs selector 294 to connect a particular distribution trunk, e.g. 142 , to carrier measurement unit 296 and directs the tuner of carrier measurement unit 296 to tune to the particular channel to be substituted. The level of the carrier is then measured and signals representing that measurement are returned to controller 135 .
- selector 294 is controlled to connect the substitute channel splitter, e.g. 291 , to the carrier measurement unit 296 . Carrier measurement will occur at the same channel carrier frequency as was measured from trunk 142 . The two measurements are compared by controller 135 which then directs via bus 235 the relevant attenuator, e.g.
- demodulators 171 , 172 , 189 and 191 may be, for example, Scientific Atlanta Demodulator No. 6250, and may include necessary receiving apparatus as is well known in the art.
- Modulators 161 - 163 , 168 - 170 , 173 and 175 may be, for example, No. 6350 by Scientific Atlanta.
- the video switches 217 and 187 may be Dynair System 21 routing switches configured with the required number of input and output ports.
- the embodiments describe systems having an exemplary number of cable channels and substitutable channels and signal sources. The number of channels and signal sources are discussed by way of example and are not limited to those described.
- the preceding description relates to specific examples of systems embodying the present invention. The described systems can be modified by persons of ordinary skill in the art without departing from the spirit and scope of the present invention which is defined by the claims attached hereto.
Abstract
Description
- This invention relates generally to the accumulation of panelist response information and more particularly to the presentation of selected information to viewers of targeted television programming and the accumulation of responses from those viewers.
- Conventional market research has involved subjecting selected groups of consumers to particular promotional material and observing their responses. There have, however, been difficulties peculiar to the exposing of the selected group to particular promotional material as well as problems peculiar to measuring their responses. A particular problem is that the method of exposure of the selected group to the promotional material or the collection of the responses may skew the results; that is, the testing itself may influence the results independently of the material being tested. More particularly, in respect to the dissemination of television advertisements, if the panelists know they are receiving special promotional material, they may react differently than were they to believe they are receiving normal promotional material. Further, the participating panelists must be divided into a control group and a test group receiving alternative material, and it is important that these groups be split so that the control and test groups are matched on relevant statistics.
- In respect to television advertising, one approach has been to use cable television with a split cable as illustrated by U.S. Pat. No. 3,366,731, issued Jan. 30, 1968 to Edward Wallerstein for Television Distribution System Permitting Program Substitution for Selected Viewers. In such a split cable system two cables originating from a single transmitting source go out in different directions. One advertisement is inserted on one cable and another advertisement on another cable. A problem that has developed with this is that the split of the cable produces control and test groups that are not properly matched for market testing. This is, the two cables are directed to different neighborhoods at the whim of the cable television company, whereas the needs of market research are more particular. It has been known to provide two cables side by side, so that both cables serve the same neighborhoods and are, therefore, likely to provide a better match of control groups to test groups. However, even here there is a problem that once the cables are laid the cables themselves select the groups; that is the television viewers are either on cable A or on cable B and do not admit of special selection to meet the needs of a particular market test.
- Another television market research system is shown in U.S. Pat. No. 4,331,973 issued May 25, 1982 to Eskin et al. With the Eskin et al. system, a substantially identical spectrum of television channels is provided to all potential viewers. Some channels of the spectrum are used to convey possible substitute signals which are not accessible to most viewers. The panelists of the system are given uniquely addressable panelist receiving stations. When panelists are to receive substitute signals, the unique addresses of their respective receiving stations are sent out to control the receiving stations to tune to the substitute signals in place of the normal signals that others will watch.
- The Eskin et al. system allows a different combination of panelists to be selected for each program substitution and has provided valuable marketing information. The system, however, requires great expense in providing and maintaining sophisticated receiving stations in each panelist household. Also, panelists at times resist the requirement for such receiving stations in addition to their VCRs and cable television distribution and decoder boxes which already connect to their televisions.
- A need exists for a market research signal substitution system which accurately represents the demographics of the community being served and which avoids the problems, costs and user resistance of an individually addressed arrangement.
- In accordance with the present invention, the target community is divided into a significant plurality of zones of coverage. In the disclosed exemplary embodiment the number of zones is 24. The cable head end produces a small plurality of distribution trunks conveying normal and substitute channel signals in a cable television distribution spectrum. Each distribution trunk is split into a plurality of cable television signal feeds which convey substantially identical signals to their source distribution trunk. Each zone receives a cable television feed signal from the cable television head end, which feed signal is distributed to the viewer households of its respective zone. The market research firm, prior to connection of feed signals to the zones, determines from information provided by volunteer panelists, which combination of zones throughout the community will demographically reflect the community as a whole or reflect a desirable attribute of the community. Based on such a determination the zones are selected and connected by cable signal feeds to one of the distribution trunks of the cable head end. The cable television head end equipment, in conjunction with equipment provided by the market research firm, from time to time produces at least one distribution trunk television signal spectrum having at least one substitute channel signal and at least one distribution trunk television signal spectrum having channel signals not including the substitute channel signal. Based on the predetermined connection of distribution trunks to zones via the signal feeds, a normal spectrum is distributed to some zones while a substituted spectrum may be delivered to other zones. A market research computer system stores the associations of panelists with the particular distribution trunks from which each panelist receives signals and analyzes panelists' shopping behavior based on the signals presented to panelists' zones.
- Each panelist in the study is assigned a panelist identification which may be in the form of a panelist identity card. When a panelist purchases goods, the panelist identification is associated with the information identifying the goods purchased and forwarded to a market research computer system. The market research firm collects the associated panelist-purchased goods information in the market research computer system which has previously been informed of which panelists are served by which zones and which zones have been provided a television spectrum signal feed including normal and substitute channel spectrums. Marketing information can then be generated based on the purchases of panelists which did and did not receive the substitute channel programming.
- The panelist responses may be obtained without any conscious action by the panelists. More particularly, in one embodiment all the panelists need do is provide initial demographic data and to identify themselves at the time of purchase of products. Otherwise they act entirely in accordance with their usual practices. Such identification might occur, for example, when the panelist uses his or her credit card for the purchase. More particularly, for grocery products at least, universal product coding (UPC) has become common. In accordance with the embodiment of the present invention, each panelist is provided with a panelist identification card having a scannable identification thereon which is recorded in a market research computer system to correspond with the particular cable signal feed and thus which programming the panelist has reviewed. The identification card is presented to the cooperating retail stores where he or she shops, where the card is scanned by a UPC product scanner along with the scanning of purchased products. The work load of the panelist is reduced merely to presenting his identification card. Data capture is electronic and automatic, both for the product and for the panelist identification. The panelist never needs to record anything. All data are recorded by the UPC scanner. The information obtained by the scanner is transmitted by the retail store to a market research computer system for association and correlation of the data with the advertisements sent out to the respective panelists. That is, the signals transmitted to the respective panelists are identified as the signals sent out by the cable television head end, and the responses of the respective panelists are noted by the scanning units of retail stores and transmitted back to the market research computer for association and correlation.
- For best association and correlation it is helpful to have an area blanketed with UPC scanners connected to the system. For example, if all of the grocery outlets, or substantially all, in a given geographical area near the panelists are provided with UPC scanners connected to the market research computer, substantially all grocery products purchased by the respective panelists are accounted for. In general, the retailers have substantially no adjustment to make beyond normal scanning, except for scanning panelist identification cards.
- A second embodiment of panelist purchase data collection may also be employed. In the second embodiment, the panelists regularly report to the marketing research computer system their panelist identification and data regarding the purchases they have made. For example, a panelist may be provided with a home UPC scanner which is used to record recent purchases. The purchase information and the panelist identity are stored in the home UPC scanner and transmitted to the market research computer system where they can be analyzed in the same manner as the retail store collected data. Many possible ways of data collection may be employed with the present system provided that the panelist identity and the products purchased are matched before market research analysis.
- It is an object of the present invention to provide panelist response scanning by the combination of a targetable television system for directing specific messages to groups of panelists in zones of the community, a plurality of panelist identification means for identifying respective panelists, data collection arrangements for identifying the products purchased by respective panelists, and market research computer system for receiving the information from the plurality of product data collection arrangements to provide such automatic indication of panelist behavior.
- The system of the present invention provides results drawn from selections of panelists in the community as a whole and does not merely represent an unscientifically selected one-half of the community as does the Wallerstein arrangement and does not require the expense and complications of the per-panelist-directed system of Eskin et al.
- In the present discussion, the term “panelist” is used to represent the individuals in a particular household. The term “normal” is used herein to signify the messages, signals or programs provided by the operation of the television system in the absence of the substitution provided by the present invention. It thus may encompass all messages, signals or programs as may be provided in the normal course of television programming, including special messages, signals or programs transmitted and received over the usual channels to which the receivers are ordinarily tunable. The term “program” encompasses commercials and other special messages.
- FIG. 1 is a general block diagram showing a cable television head end constructed to deliver cable television signals, including substitute signals to a community divided into zones;
- FIG. 2 is a block diagram of a first embodiment of a cable television head end;
- FIG. 3, shows an rf cable splitter and a plurality of fiber optic drivers;
- FIG. 4 is a block diagram of a second embodiment of a cable television head end;
- FIG. 5 shows an addressable switch bay used in the embodiment of FIG. 4; and
- FIG. 6 is a block diagram of a third embodiment of a cable television head end.
- FIG. 1 is a general block diagram showing a targeted television system in accordance with the present invention for delivering cable television signals to a viewer community represented by
irregular area 101. Twenty-four zones, of which onlyzones 103 through 108 have been numbered, make up the community. Each of the zones represents an area of the community in which the cable television subscribers are served from a single cable feed such as cable feeds 109 and 111. The zones will not be as regular as shown because they are determined by the cable television company based on the economics of providing cable services. Each zone, however, includes a number of geographically proximate subscribers and is referred to herein as being substantially contiguous. Further, it is possible that over time the zone boundaries will change as new subscribers request cable service and other subscribers give up their prior service. - Each zone, e.g.103, includes a signal distribution point such as 113 which receives the cable feed, e.g. 109 and distributes the cable TV spectrum of the cable feed by means well known in the art to the viewers in the zone. The spectrum of signals on a cable feed, e.g. 109, is provided by a
cable head end 123.Cable head end 123 includes a plurality ofsignal inputs 125 for receiving the normal TV channels from over-the-air broadcasts or satellites. It should be mentioned that the normal channels may also include programming which is provided by the cable TV operator, such as video tapes of community events. The sources of normal signals, e.g., 125, are signal inputs to a televisionchannel connection apparatus 127, as are a plurality of input signals 128 from a substitutechannel signal source 129. In addition, thechannel connector 127 provides a plurality of normal TV channels to thesubstitute signal source 129 over a plurality ofconnections 131. Substitutesignal source 129 andconnection apparatus 127 cooperate under the control of acomputerized controller 135 to produce television signals for threedistribution trunks distribution trunks driver 137 which includes an 8-way signal splitter 126 and cable feed drivers, e.g. 122, 124 (FIG. 3). By the operation ofsubstitute signal source 129,connector apparatus 127 andcontroller 135, the television channel signals may be different on each of thedistribution trunks feeder cables feeder cables driver 139 and the feeder cables of splitter/driver 141 may convey only normal channels. - When a market research firm begins business in a community, the population is solicited to identify cable television subscribers who agree to participate as market survey panelists. As a part of acceptance as panelists, such volunteers provide the market researcher with demographic data comprising information about various types of personal and shopping behaviors. For example, the volunteers may disclose the names and ages of individuals in the panelist's household, household income and likes and dislikes, as well as, the stores frequently shopped and the brands frequently purchased. Based on the survey data the market researcher can determine the traits of the panelist for later use in analyzing market research data. Also based on the panelist-provided information, the market researcher determines which of the zones, e.g.103-108, should be connected to which of the splitter/
drivers drivers driver 137, all 8 distribution points labeled B, e.g., 154, 155 and 156, are connected to splitter/driver 139 and all distribution points labeled C are connected to splitter/driver 141. The described method of selecting interconnection permits a demographic selection of a test group, e.g. A, for a new (substitute) advertisement, while another group, e.g., B, can be selected as a control group which receives normal signals rather than the new substitute advertisement. - The
connection apparatus 127 receives all channels of normal signals and substitute channel signals and combines the received channel signals onto the threedistribution trunks receivers 125 are properly channel modulated and combined as a distribution channel spectrum on all threedistribution trunks distribution trunks driver way rf splitter 126, each output of which feeds afiber optic driver feeder cables - When a new advertisement is to be tested it is installed at
substitute signal source 129 and made available on a lead 128 as an input to theconnection apparatus 127. Under the control ofcontroller 135connection apparatus 127 replaces normal signals in a channel on one of thedistribution trunks distribution trunk 142, the substitute signal is delivered to all subscribers, including all panelists, in zones A. Thus the panelists in zones A are the test group and the panelists in either zones B or zones C, which do not receive the new advertisement, may be chosen as a control group. - FIG. 2 shows an embodiment of a cable head end which is equipped to provide channel substitution in the manner described above for a 60 channel distribution system. With the present embodiment twelve channels may be subject to signal substitution, while the remaining 48 channels are not subject to signal substitution. For ease of understanding the 12 substitutable channels are channels 2-13 while the other channels are 14-61. Other combinations of channels could easily be used. FIG. 2 includes forty-eight
signal inputs 125B which are shown as off-air antennas but could be satellite receivers or inputs resulting from local TV cameras or VTRs. Each signal input is at base band or is converted to base band by a respective demodulator of which demodulators 171 and 172 are shown. The base band output of each demodulator is then modulated by a respective fixed channel modulator of which modulators 174 and 175 are shown. Each of the forty-eight modulators is tuned to a different output channel so that the outputs of allmodulators head end combiner 177 into a spectrum of channels 14-61.Combiner 177 splits the spectrum of channels 14-61 into three identical copies onoutputs way combiner combiners distribution trunks - FIG. 2 includes twelve normal
channel signal inputs 125A which, as described below, are subject to being replaced by substitute channel signals through the use of abase band switch 187. As withchannel inputs 125B,channel inputs 125A are shown as off-air signals but other signal types may be used. Eachchannel input 125A is demodulated to base band in a respective demodulator, e.g. 189, 191, which is connected viacables 192 as an input tobase band switch 187. Up to six substitute channels, at base band, are also connected from the market researchers asinputs 193 tobase band switch 187. It should be mentioned that the substitute channels may also include test signals which can be switched back to the market researchers for equipment testing onoutputs 194. The base band signals switched back to the market researchers onconductors 194 may also include a selected normal channel so that the substitute source can be synchronized with the normal channel before channel substitution occurs. -
Base band switch 187 responds to control signals fromcontroller 135 to selectively connect theinputs base band switch 187 compriseoutputs 194 to the market researchers andoutputs 195 which are used to complete the channel spectrum sent to subscribers via distribution trunks 142-144. To provide a complete spectrum of channels 2-61 on each distribution trunk 142-144, three fixed channel modulators for each channel 2-13 are connected tooutputs 195 of thebase band switch 187. In FIG. 2modulators channel 2 are all shown connected toseparate outputs 195 ofbase band switch 187, as aremodulators channel 13. Threecombiners way combiners combiner 197 is connected to channel 2modulator 161,channel 13modulator 168 and to one modulator (not shown) for each channel 3-12. When connected as described, the distribution trunks 142-144 have a channel spectrum fromchannel 2 to channel 61 and the content of channels 14-61 is taken substantially directly frominputs 125B and the continent of channels 2-13 is taken fromswitch 187. - During nonsubstitution, the cable service provider or the market researchers instruct
switch 187, by means ofcontroller 135, to connect eachinput signal 125A to all three of the modulators, e.g. 161, 162 and 163, for that input signal. Thus, all cable subscribers will receive all normal channels 2-61 from their connected distribution trunks 142-144. When a substitution is to occur, for example, onchannel 2 for subscribers connected to the A feed, the market researchers controlswitch 187 to connect thenormal channel 2 signal to the market researchers viapaths 194 as well to the threechannel 2modulators channel 2 from thechannel 2 signal which they receive onpath 194. At the moment for signal substitution, the market researchers send the substitute new advertisement to an input, e.g. 193 a, ofswitch 187 which is controlled to connect theinput 193 a receiving the substitute signal to the output connected tomodulator 161. The exact moment of substitution is determined from the synchronism information received fromnormal channel 2, as is well known in the art. While the substitute advertisement is being input to switch 187 it is fed onchannel 2 to all subscribers, including panelists, connected todistribution trunk 142. Those panelists connected todistribution trunks normal channel 2 signals frominputs 125A. At the end of channel substitution,switch 187 is controlled to disconnectinput 193 a and to connect thechannel 2 input signal directly frominput 125A tomodulator 161. During the time of signal substitution, the substitution signals are sent to approximately one-third of the cable subscribers. Given the demographic selection of which zones are connected to the distribution trunks, a proper test group of panelists has received the substitute signals. Similarly, the panelists connected todistribution trunks - FIG. 2 shows a market
research computer system 145 which is connected to the market research organization, thescan networks 159 of local retail stores, to thetelephone network 160 for other panelist information and to thecontroller 135. The market research computer system, which may comprise multiple computers, stores lists of the panelists connected to each of the distribution trunks 142-144. During signal substitution it is informed by the researchers, on which trunk the substitute commercial was carried. The marketresearch computer system 145 can use this information to evaluate panelist data collected at local retail stores. - In the description of FIG. 2,
base band switch 187 has been shown to include 12input signal 125A ports and 6 substitute signal input ports as well as 36 channel output ports and a plurality of marketresearch output ports 194. It should be mentioned that other combinations of substitute and normal signal inputs and other numbers ofchannel output ports 195 can be used. Although a largerbase band switch 187 would be needed, the system of FIG. 2 could include, for example, 18input sources 125A, and 9substitute sources 193. Such a system would require 54 (3×18)output ports 195, each with a fixed channel modulator such asmodulator 170. - FIG. 4 shows a block diagram of a cable head end system which may be used as an alternative to the cable head end system of FIG. 2. The system of FIG. 4 provides the three distribution trunks142-144 each conveying a spectrum of 60 cable TV channels. The signals of any of the 60 channels may be substituted in the manner described below. 60
input signal sources 125 are used in the system to provide signals for all channels. Although the input signal sources are shown as off air antennas, they may be cable feeds, satellite receivers or VTRs, as is common in the provision of cable TV services. - The input signals from
sources 125 are demodulated (171, 172) if received at rf, and each is modulated to the frequency of a unique one of the 60 channels 2-61 in respective modulators. Of the 60 modulators, only two are specifically shown, e.g., 173, 175. The output of each modulator, e.g. 173, is applied as an input to a four-way splitter, e.g. 201, 203. Accordingly, 60 four-way splitters channel group combiner 208. In FIG. 2,cable 205 connects four-way splitter 203 togroup combiner 208 andcable 206 connects four-way splitter 201 to the channel group combiner. A broadvertical line 240 represents a bundle of individual coaxial cables, each conveying one modulated channel. Thechannel group combiner 208 thus receives 60 rf cables each conveying signals from one of theinput signal sources 125 in a unique television channel. A plurality of cable channel combiners (not shown), as are well known in the art, make upcombiner 208 which combines all received channels onto a single 60 channel spectrum on an rfcoaxial cable 209. Asignal splitter 211 receives the channel spectrum oncable 209 and splits the spectrum into a plurality of identical copies. As will be seen, the number of copies represents the number of channels on which signal substitution can be simultaneously occurring. The present embodiment allows 6 channels to be simultaneously substituted, which results insplitter 211 being an eight-way splitter with two outputs unconnected. - Each of the six active outputs of
splitter 211 is connected to a frequency agile demodulator (FAD) of which 213 and 215 are shown in FIG. 4. The frequency agile demodulators receive control signals fromcontroller 135, via acontrol bus 235, which determine the particular television channel they are to receive and demodulate. For example,demodulator 213 may receive fromcontroller 135signals defining channel 2 anddemodulator 215 may receive signals defining channel 17. Thereafter,demodulators channels 2 and 17 ofcable 209, respectively, and apply the resulting base band signals as inputs to avideo switch 217. - In the present
embodiment video switch 217 is a twelve input by twelve output switch which connects signals at the input ports to output ports defined bycontroller 135. Six input ports are connected to the base band output signals of the frequencyagile demodulators sources video switches 217 are connected to frequency agile modulators (FAM) of which frequencyagile modulators video switch 217 are connected byleads 226 as inputs to a vertical blanking internal (VBI)timing unit 227.VBI unit 227 identifies timing information, including vertical blanking information, from each signal onleads 226 and is interrogated from time to time bycontroller 135. On the basis of the synchronizing information, switching can be commanded bycontroller 135 during the vertical blanking interval. - Frequency
agile modulators controller 135 viabus 235 to modulate base band signals received fromvideo switch 217 to a television channel identified in the command from the controller. For example, frequencyagile modulator 223 may be commanded to generate output signals modulated tochannel 2 and frequencyagile modulator 225 may be commanded to generate output signals modulated to channel 17. When output signals in another channel, e.g. channel 9, are needed, new commands are sent to an available modulator, e.g. 213, to change its modulation frequency to channel 9. The output of each frequency agile modulator is applied to respective three-way splitter of which three-way splitters - The embodiment of FIG. 4 includes three switched
combiners way splitters way splitters agile modulators combiner addressable switch bays 250, each comprising 12 single pole, single throw rf switches labeled J1-J12 in FIG. 5. The switch bay also includes an address decoder with a manuallysettable address 251 and aconnection 253 to thecontrol bus 235. The address decoder responds to address commands fromcontroller 135 by turning one of the switches J1-J12 on or off as specified in the command. After a command to enter a state, a switch remains in that state until commanded to change state. The outputs of the switches J1-J12 are connected as inputs to a plurality of rf combiners which are connected to produce a spectrum of TV channels 2-61 on a distribution trunk, e.g. 142. As shown in FIG. 4, the switchedcombiners distribution trunks - The spectrum of channels applied to any of
distribution trunks combiners distribution trunk 142, switchedcombiner 245 receives addressed commands fromcontroller 135 to turn on all 60 switches connecting theinput signal sources 125, via their respective channel modulators, to the distribution trunk. The other switches of switchedcombiner 245 are turned off. When a signal is to be substituted in a given channel ondistribution trunk 142, switchedcombiner 245 is commanded to switch the given channel from input signals 125 off and the substitute signal from video switch 217 (in the given channel) on.Controller 135 performs such switching on and off during the vertical blanking interval as identified by vertical blankinginterval timing unit 227. - The following illustrates the delivery of substitute signals in channel 17 on
distribution trunk 142. Initially, all channels ondistribution trunk 142, including channel 17, are selected by switchedcombiner 245 from the input sources 125. At a time prior to actual substitution,controller 135 sends to an available frequency agile demodulator, e.g. 215, a command specifying channel 17 and sends to an available frequency agile modulator, e.g. 225, a command also specifying channel 17.Controller 135 also sends to video switch 217 a command directing that the switch input of frequencyagile demodulator 215 be switched to the switch output of frequencyagile modulator 225. After frequencyagile demodulator 215,video switch 217 and frequencyagile modulator 225 have responded, a copy of the channel 17 signals frominput source 125 is available at the output of three-way splitter 238 and at an input of verticalblank timer unit 227. Switchedcombiner 245 is then commanded during a vertical blanking interval to turn off the switch J1-J12 connected to the channel 17input signal source 125 and to turn on the channel 17 input from three-way splitter 238. At this point, channel 17 is delivered to the subscribers connected todistribution trunks input source 125 and channel 17 is delivered to the subscribers connected todistribution trunk 142 via thechannel group combiner 208 andvideo switch 217. When the time for signal substitution occurs, as is recognized by an operator at the market researcher, substitute signal source, e.g. 219, is started andcontroller 135 commandsvideo switch 217 to connect the switch input ofsignal source 219 to the output connected to frequencyagile modulator 225. At the same time the prior connection between frequencyagile demodulator 215 and frequencyagile modulator 225 is broken. This removes the normal signals from channel 17 ondistribution trunk 142 and replaces them with the substitute signals fromsource 219. During the time of signal substitution the substitute signal fromsource 219 will be available ondistribution trunk 142. At the conclusion of the substituted signal, thevideo switch 217 is commanded to reconnect frequencyagile demodulator 215 to frequencyagile modulator 225 so that the continuing normal signal of channel 17 will be connected to distribution trunk 412. When all substitution for channel 17 is completed, switchedcombiner 245 is commanded to turn off the channel 17 connection from thevideo switch 217 and to turn on the channel 17 signal from the input sources 125. - FIG. 6, which comprises an alternative embodiment for the cable head end, is largely the same as FIG. 4. With the system of FIG. 6, each switched
combiner distribution trunks distribution trunks video switch 217 to a frequency agile modulator, e.g. 223, 225 and 276 connected to the distribution trunk. - When replacing one channel signal with another, it is desirable that both signals are of similar level so that subscribers will not be aware of the substitution. FIG. 6 includes signal sampling and amplitude control apparatus to correct signal level mis-matches. Signal levels and gains throughout the system are controlled by fixed means so that the signal levels from four-
way splitters agile modulators controller 135. The signals on each distribution trunk 142-144 are split by splitters 283-285, respectively, and communicated to aselector 294 which also receives signals representing the outputs of attenuators 268-273 which are taken by a plurality of splitters 291-286, respectively.Selector 294 comprises a selector switch having 9 inputs, one from each splitter 283-291, and oneoutput 295. A carrier measurement unit, which includes a controllable tuner and a carrier amplitude measurement unit (not shown), is connected to theoutput 295 ofselector 294. - When signals are about to be substituted,
controller 135 directsselector 294 to connect a particular distribution trunk, e.g. 142, tocarrier measurement unit 296 and directs the tuner ofcarrier measurement unit 296 to tune to the particular channel to be substituted. The level of the carrier is then measured and signals representing that measurement are returned tocontroller 135. Similarly,selector 294 is controlled to connect the substitute channel splitter, e.g. 291, to thecarrier measurement unit 296. Carrier measurement will occur at the same channel carrier frequency as was measured fromtrunk 142. The two measurements are compared bycontroller 135 which then directs viabus 235 the relevant attenuator, e.g. 268, to attenuate the signals at the output of frequencyagile modulator 223 to the same level as those sensed ontrunk 142. Thereafter, the attenuation level provided atattenuator 268 will remain the same until a new substitution is proposed. It should be mentioned that the signal matching capabilities shown and described with respect to FIG. 6 are easily applied to the embodiments of FIGS. 2 and 4. - In the preceding embodiments,
demodulators
Claims (24)
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