WO2001006687A9 - Method and apparatus for selecting a satellite signal - Google Patents
Method and apparatus for selecting a satellite signalInfo
- Publication number
- WO2001006687A9 WO2001006687A9 PCT/US2000/017373 US0017373W WO0106687A9 WO 2001006687 A9 WO2001006687 A9 WO 2001006687A9 US 0017373 W US0017373 W US 0017373W WO 0106687 A9 WO0106687 A9 WO 0106687A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ird
- signal
- command signal
- selector switch
- satellite
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
Definitions
- the present invention relates to a Direct Broadcast Satellite (DBS) system. More particularly, the invention relates to a method and apparatus for selecting one of a plurality of information signals broadcast from at least one satellite in the Direct Broadcast Satellite (DBS) system.
- DBS Direct Broadcast Satellite
- Direct Broadcast Satellite (DBS) content providers have chosen to use multiple satellite networks to distribute their signals.
- a Low Noise Block converter (LNB) supply voltage ( + 1 3V/ + 1 8V) has been used to select between the two polarities of signals that were available on a single satellite network.
- LNB Low Noise Block converter
- the presence or absence of a 22 KHz tone superimposed on the LNB supply voltage may be used to switch between either of the two satellite networks.
- the number of satellite networks grows beyond two, the voltage, and tone switching combination is no longer sufficient.
- One method to overcome this impediment is through bi-directional communications between an integrated receiver/decoder (IRD) and a satellite selector switch, such as used in the European standard known as DISEQ.
- IRD integrated receiver/decoder
- DISEQ satellite selector switch
- the IRD sends a command signal to the selector switch to switch to a selected satellite network.
- the two-way (bidirectional) protocol provides an avenue for feedback from the switch to the IRD.
- the selector switch upon switching, sends an acknowledgement message back to the IRD.
- bi-directional protocols rather many utilize unidirectional messaging.
- the problem encountered by an integrated receiver/decoder (IRD) using a unidirectional messaging system is that the IRD has no feedback from the switch. Thus, a message may be sent to the switch, nevertheless, the IRD has no way of knowing whether or not the switch actually received the message and then switched.
- the lack of feedback may cause a problem if the user disconnects and reconnects the transmission coaxial cable, for example, in an attempt to reset the IRD and switch.
- the IRD will search for the lost satellite signal throughout each of the satellite networks by attempting to send messages to the switch, even though the switch is not connected to the IRD.
- the switch will default to the prior transponder, which is not necessarily the transponder the IRD was expecting to switch to. Thus, the user will receive the wrong satellite signal.
- the lack of feedback from the switch may cause a problem when the IRD sends a command signal that is degraded or incomplete (e.g., coaxial cable signal losses).
- the switch may fail to properly select the correct transponder on a satellite or the correct satellite thereby sending the user an incorrect satellite signal.
- a user selects a satellite signal via an integrated receiver/decoder (IRD), from at least one satellite network.
- IRD integrated receiver/decoder
- the IRD sends a command signal to a selector switch to switch to one of a plurality of low noise block converters (LNB) coupled to a satellite collector dish.
- LNB low noise block converters
- the command signal is transmitted from the IRD whenever the integrated receiver/decoder has not locked on to the satellite signal. Once the IRD acquires the satellite signal, the IRD repeats the transmission of the command signal to the selector switch. Thus, in the event that the selector switch failed to switch to the LNB corresponding to the initial command signal, then the repeated command signal helps to ensure that the selector switch switches to the LNB corresponding with the latest command signal sent by the IRD.
- FIG. 1 depicts a block diagram of a Direct Broadcast Satellite System
- FIGS. 2A and 2B depict a flow diagram of a method for selecting a broadcasted satellite signal from a satellite network
- FIG. 3 depicts a flow diagram of a method for providing feedback to an integrated receiver/decoder from a device coupled via a unidirectional signal path.
- FIG . 1 depicts a block diagram of a direct broadcast satellite communications system 1 00.
- the direct broadcast satellite (DBS) system 1 00 comprises a service provider 1 30 from which audio, video, and/or data may be (hereinafter "satellite signal") uplinked to a satellite network comprising at least one satellite network 1 32.
- Each satellite network 1 32 includes a satellite 1 33 having a plurality of transponders for downlinking the satellite signal to a plurality of subscriber equipment 102 having satellite signal receiving capabilities.
- Subscriber equipment 1 02 for a single location is depicted in FIG. 1 .
- a DBS service provider 1 30 provides hundreds of television channels including a program guide from which a subscriber may choose programming.
- the subscriber may select any channel via an input device 1 03 such as a remote control, for tuning an integrated receiver/decoder (IRD) 1 04 to the carrier frequency of the selected satellite signal.
- IRD integrated receiver/decoder
- the direct broadcast satellite system 100 in conjunction with a method of requesting a satellite signal by a subscriber, as will be described in more detail hereinafter, advantageously ensures that the correct satellite signal is selected and coupled to the IRD 1 04.
- the subscriber equipment 1 02 comprises the IRD 1 04 having a processor 106, a tuner 1 07, memory 1 08, and a datalink 1 05.
- the tuner 1 07 tunes to a desired transponder frequency and down-converts that frequency to a baseband signal (e.g., approaching zero cycles/sec.)
- the baseband signals are sent to the datalink
- the baseband signals are converted from an analog to digital data format.
- the digital data is then sent to the memory 1 07 and processor 1 06 for storage and further processing, respectfully.
- the IRD 1 04 is coupled to a selector switch 1 20, via a signal path 1 09 such as a coaxial cable or a common transmission line.
- the selector switch 1 20 comprises a controller 1 22 such as a microcontroller, and a plurality of switching devices 1 24 such as relays.
- the processor 1 06 of the IRD 1 04 Upon sending a subscriber request for information, the processor 1 06 of the IRD 1 04 sends a command signal (e.g., 22 kHz tone) via the coaxial cable 1 09, to the microcontroller 1 22 of the selector switch 1 20.
- the selector switch 1 20 is at coupled to at least one collector dish 1 26- through 1 26 m (collectively, collector dishes 1 26).
- Each collector dish 1 26 has at least one low noise block (LNB) converter 1 28 ⁇ through 1 28 p (collectively LNB 1 28) coupled to the collector dish 1 26 via a feedhorn (not shown).
- LNB low noise block
- an elliptical collector dish 1 26 may have three LNBs 1 28 coupled to a single feedhorn, wherein each LNB is capable of receiving signals from three distinct satellite networks 1 32.
- each relay 1 24 of the selector switch 1 20 is correspondingly coupled to at least one low noise block (LNB) converter 1 28 via at least one signal path 1 21 , through 1 21 p (collectively signal paths 1 21 ) .
- LNB low noise block converter
- Each low noise block converter (LNB) is capable of selectively receiving the radiated signals from one of the satellite networks 1 32 and down-converting the satellite signal to an intermediate frequency (IF) signal. Thereafter, the IF signals travel via the signal path 1 21 , through the selector switch 1 20 and to the IRD 1 04.
- Satellites radiate microwave signal beams in various bandwidths having a range of frequencies such as the C-band (i.e., 3.7 to 6.425 GHz) and Ku-band
- Satellite television signals are polarized. This property of the satellite signals is used to improve spectrum efficiency in the satellite frequency bands. Two different types of polarization (i.e., the orientation of the electric field distal from the antenna) have been employed in satellite television applications.
- Linear polarization has two alternate states, i.e., horizontal and vertical polarization (HP and VP) .
- circular polarization has two alternate states, i.e., left hand, and right hand circular polarization (LHCP and RHCP) .
- the IRD 1 04 is capable of determining the type of polarization for the satellite signal selected by a user.
- the IRD 1 04 then sends a 1 3 volt or 1 8 volt signal as part of the command signal to the LNB 1 28 to enable the LNB 1 28 to differentiate between the polarization states i.e., the LHCP and RHCP, or the HP and VP.
- the IRD 1 04 may send as the command signal a 22 KHz tone to the selector switch 1 20, where the presence or absence of the tone is used to switch between two satellites. In an instance where more than two satellite networks exist, the command signal will provide a message containing the orbital slot pertaining to the selected satellite.
- the LNB 1 28 corresponding to the command signal sent by the IRD 1 04 is able to select and amplify the incoming polarized satellite signal to a level that can be demodulated by the IRD 1 04. Furthermore, the LNB 1 28 down- converts the incoming satellite signal to an intermediate frequency (IF), illustratively, from a 1 2 GHz range down to 1 to 2 GHz. The down-conversion is performed by the LNB 1 28 in order to minimize high cable loses, typically occurring at 4 and 1 2 GHz.
- IF intermediate frequency
- the IRD 1 04 locks onto the selected satellite signal, and the selected satellite signal is down-converted to the specific frequency pertaining to the program channel selected by the user. Thereafter, the satellite signal is demodulated and decoded into the audio, video, and/or data signal components. The audio, video, and/or data signal components are then sent to a subscriber output device 1 08 such as a television set, recorder, computer, or other processing or recording device.
- a subscriber output device 1 08 such as a television set, recorder, computer, or other processing or recording device.
- FIGS. 2A and 2B depict a flow diagram of a method for selecting a broadcasted satellite signal from a satellite network.
- the method 200 starts at step 201 and proceeds to step 202 where a subscriber makes a request for information by selecting an information channel from their remote control device.
- an integrated receiver/decoder IRD receives the subscriber request and a processor of the IRD sends a command signal, such as a 22 KHz pulse width modulation tone, over a coaxial cable coupled to a selector switch having a microcontroller.
- the microcontroller of the selector switch decodes the command signal from the IRD to identify a signal path required to receive the satellite signal selected by the user.
- the microcontroller activates a relay in the selector switch to couple the IRD to a corresponding satellite signal collector dish having a low noise block converter (LNB) .
- LNB low noise block converter
- the corresponding LNB allows the collector dish to focus and downlink the radiated satellite signals from the service provider's satellite to the receiving elements of the selected LNB.
- step 208 the selected satellite signal is down-converted by the LNB to an intermediate frequency and then transferred through the selector switch and coaxial cable to the IRD.
- step 21 0 the IRD acquires and locks on to the down-converted satellite signal and then the method 200 proceeds to step 21 2.
- step 21 2 the IRD repeats the transmission of the command signal to the selector switch. The repeated command signal is provided to ensure that the selector switch is not set to an LNB corresponding to a different transponder or satellite network carrying a satellite signal not requested by the IRD.
- step 21 if the selector switch is correctly coupled to the appropriate
- step 204 the method 200 proceeds to step 21 6.
- step 21 6 the repeated command signal is disregarded without consequence and the IRD continues to receive the same satellite signal without interruption.
- the subscriber will receive the requested satellite signal as per the initial command signal sent by the IRD, without interference from the repeated command signal.
- the selector switch may appear to be set to the wrong LNB from the perspective of the IRD. Such situation may occur when the IRD has lost the locked satellite signal.
- the satellite signal is lost, i.e., "unlocked”
- the IRD sends out consecutive command signals to the selector switch in order to search for the lost satellite signal.
- the command signals are sent to the selector switch to switch amongst the LNBs until a satellite signal is received by the IRD.
- the unlocking of the satellite signal may occur due to noise in the system, such as degradation of the signal on the coaxial cable, or a disruption in the connection between the IRD and switch, illustratively caused by a user disconnecting the coaxial cable temporarily to reset the IRD and switch, or otherwise.
- the IRD will stop receiving the locked satellite signal.
- the IRD will then begin searching for the lost signal from the service provider.
- the search is performed by the IRD across the satellite network, which may include switching the LNBs between satellites if more than one satellite network exists. Every time the IRD sends a command signal to the selector switch during the search, the IRD will assume the selector switch has switched according to the IRD's commands. However, the user, illustratively, has disconnected the coaxial cable in this instance, and therefore the IRD and selector switch are no longer coupled.
- the IRD Since the communications between IRD and switch is unidirectional, the IRD does not have any means to receive direct feedback from the selector switch after issuing a command signal. Therefore, the IRD mistakenly thinks the selector switch has responded to its commands, when in fact the selector switch has never received the command signals.
- the IRD When the user reconnects the coaxial cable, the IRD will acquire the satellite signal of which the IRD was originally tuned and locked upon via the LNB. Notwithstanding, the tuner of the IRD will be set to a different channel since the IRD has been searching throughout the satellite network for a signal. Thus, this newly acquired signal received by the IRD is deemed the wrong signal by the IRD. Therefore in step 21 4, if the selector switch is not correctly coupled to the appropriate LNB to receive the selected DBS signal, then in step 21 8, the repeated command sent signal by the IRD to the selector switch changes the selector switch setting to the correct LNB. In particular, the selector switch then activates the relay coupled to the LNB corresponding to the last command signal the IRD sent out during its search for the satellite signal. When the selector switch switches to the (correct) LNB corresponding to the repeated (latest) IRD command signal, the previous (incorrect) satellite signal is unlocked from the IRD.
- step 220 the LNB receives, down-converts, and transfers the correct satellite signal to the IRD.
- step 222 the IRD again acquires and locks upon the incoming satellite signal.
- step 224 the processor of the IRD sends a repeated command signal to the selector switch.
- the repeated command signal is sent since, in step 21 8, the IRD had become unlocked from the previous satellite signal and thereafter performed a signal search. Then, in step 226, the repeated command signal of step 222 is ignored and the IRD continues to receive and lock onto the same satellite signal without consequence.
- the method 200 is designed to send a command signal whenever the tuner of an IRD is not locked onto a satellite signal. Furthermore, whenever the tuner of an IRD does lock onto a newly acquired satellite signal, a repeated command signal is sent to the selector switch to ensure that the selector switch has selected and coupled to the appropriate LNB. The method 200 then proceeds to step 230, where it ends until a user either selects another satellite channel or the IRD becomes unlocked from the satellite signal for some other reason such as discussed herein.
- FIG. 3 depicts a flow diagram of a method for providing feedback to an integrated receiver decoder (IRD) from a device coupled via a unidirectional signal path. Specifically, method 300 provides feedback to an IRD decoder
- the method 300 starts at step 301 , and proceeds to step 302 where the IRD sends a command signal to the selector switch to couple a low noise block converter LNB to the IRD to receive a satellite signal from a satellite network, as selected by a user.
- step 304 if the command signal is without degradation, then the method 300 proceeds to step 306.
- step 306 the method 300 proceeds to method 200, beginning at step 206 as depicted in FIG . 2.
- step 304 the command signal is incomplete or degraded to the point that a microcontroller of the selector switch cannot determine which LNB is to be coupled to the IRD
- step 308 the microcontroller terminates the satellite signal it is currently receiving. In this instance, the microcontroller deactivates or disconnects the active relay receiving the satellite signal.
- the satellite signal being broadcast from the satellite and received by the LNB is cut off at the selector switch, resulting in the IRD becoming unlocked from the satellite signal.
- step 31 the IRD begins to search for the lost satellite signal. The search by the IRD is performed by repeating the command signal it previously sent to the selector switch. Thereafter, the method 300 proceeds to step 31 2 where the method 300 returns to method 200, beginning at step 206 as depicted in FIG. 2.
- the method provides feedback to the IRD whenever the command signal sent by the IRD is degraded beyond the microprocessor of the selector switch's ability to determine which LNB is required to satisfy the command signal sent by the IRD.
- the microprocessor terminates the currently received satellite signal, that act provides feedback to the IRD to let the IRD know that the command signal the IRD just sent was defective.
- the IRD will know that the selector switch did not respond to IRD's command, and a repeated command signal must be issued. It should be apparent to those skilled in the art that a novel method for ensuring a correct satellite signal is being received by a tuner of an integrated receiver/decoder (IRD) has been provided.
- IRD integrated receiver/decoder
- a method inventively repeats the command signal sent to the selector switch to couple the IRD with an LNB corresponding to the broadcast channel selected by a user, thereby providing redundancy. Additionally, in another embodiment, a method provides feedback to the IRD from the selector switch to force the IRD to send a repeated command signal in an instance that a prior command signal sent by the
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA02000695A MXPA02000695A (en) | 1999-07-19 | 2000-06-23 | Method and apparatus for selecting a satellite signal. |
AU58866/00A AU770300B2 (en) | 1999-07-19 | 2000-06-23 | Method and apparatus for selecting a satellite signal |
DE60044253T DE60044253D1 (en) | 1999-07-19 | 2000-06-23 | METHOD AND DEVICE FOR SELECTING A SATELLITE SIGNAL |
BRPI0012687A BRPI0012687B1 (en) | 1999-07-19 | 2000-06-23 | method and apparatus for selecting a satellite signal |
JP2001511017A JP4667688B2 (en) | 1999-07-19 | 2000-06-23 | Method and apparatus for selecting satellite signals |
EP00944831A EP1197019B1 (en) | 1999-07-19 | 2000-06-23 | Method and apparatus for selecting a satellite signal |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14445699P | 1999-07-19 | 1999-07-19 | |
US60/144,456 | 1999-07-19 | ||
US09/475,444 | 1999-12-30 | ||
US09/475,444 US6944878B1 (en) | 1999-07-19 | 1999-12-30 | Method and apparatus for selecting a satellite signal |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001006687A1 WO2001006687A1 (en) | 2001-01-25 |
WO2001006687A9 true WO2001006687A9 (en) | 2002-06-06 |
Family
ID=26842018
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/017373 WO2001006687A1 (en) | 1999-07-19 | 2000-06-23 | Method and apparatus for selecting a satellite signal |
Country Status (11)
Country | Link |
---|---|
US (1) | US6944878B1 (en) |
EP (1) | EP1197019B1 (en) |
JP (1) | JP4667688B2 (en) |
KR (1) | KR100741332B1 (en) |
CN (1) | CN1227845C (en) |
AU (1) | AU770300B2 (en) |
BR (1) | BRPI0012687B1 (en) |
DE (1) | DE60044253D1 (en) |
MX (1) | MXPA02000695A (en) |
MY (1) | MY125253A (en) |
WO (1) | WO2001006687A1 (en) |
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1999
- 1999-12-30 US US09/475,444 patent/US6944878B1/en not_active Expired - Lifetime
-
2000
- 2000-06-23 KR KR1020027000629A patent/KR100741332B1/en active IP Right Grant
- 2000-06-23 MX MXPA02000695A patent/MXPA02000695A/en active IP Right Grant
- 2000-06-23 EP EP00944831A patent/EP1197019B1/en not_active Expired - Lifetime
- 2000-06-23 JP JP2001511017A patent/JP4667688B2/en not_active Expired - Lifetime
- 2000-06-23 DE DE60044253T patent/DE60044253D1/en not_active Expired - Lifetime
- 2000-06-23 WO PCT/US2000/017373 patent/WO2001006687A1/en active IP Right Grant
- 2000-06-23 CN CNB00810574XA patent/CN1227845C/en not_active Expired - Lifetime
- 2000-06-23 BR BRPI0012687A patent/BRPI0012687B1/en not_active IP Right Cessation
- 2000-06-23 AU AU58866/00A patent/AU770300B2/en not_active Expired
- 2000-07-14 MY MYPI20003241 patent/MY125253A/en unknown
Also Published As
Publication number | Publication date |
---|---|
BRPI0012687B1 (en) | 2016-03-29 |
MXPA02000695A (en) | 2003-07-21 |
CN1227845C (en) | 2005-11-16 |
KR100741332B1 (en) | 2007-07-23 |
MY125253A (en) | 2006-07-31 |
DE60044253D1 (en) | 2010-06-02 |
EP1197019A1 (en) | 2002-04-17 |
JP2003505924A (en) | 2003-02-12 |
AU770300B2 (en) | 2004-02-19 |
WO2001006687A1 (en) | 2001-01-25 |
BR0012687A (en) | 2002-04-16 |
US6944878B1 (en) | 2005-09-13 |
AU5886600A (en) | 2001-02-05 |
JP4667688B2 (en) | 2011-04-13 |
KR20020019530A (en) | 2002-03-12 |
CN1361954A (en) | 2002-07-31 |
EP1197019B1 (en) | 2010-04-21 |
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