WO2002087166A1 - Local area network system using master antenna television network - Google Patents

Local area network system using master antenna television network Download PDF

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Publication number
WO2002087166A1
WO2002087166A1 PCT/KR2002/000429 KR0200429W WO02087166A1 WO 2002087166 A1 WO2002087166 A1 WO 2002087166A1 KR 0200429 W KR0200429 W KR 0200429W WO 02087166 A1 WO02087166 A1 WO 02087166A1
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WO
WIPO (PCT)
Prior art keywords
signal
section
internet
level
upward
Prior art date
Application number
PCT/KR2002/000429
Other languages
French (fr)
Inventor
Sin-Yul Park
Kyung-Keon Park
Dong-Hee Choi
Original Assignee
Dexter Communications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dexter Communications, Inc. filed Critical Dexter Communications, Inc.
Publication of WO2002087166A1 publication Critical patent/WO2002087166A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/478—Supplemental services, e.g. displaying phone caller identification, shopping application
    • H04N21/4782—Web browsing, e.g. WebTV
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2801—Broadband local area networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21—Server components or server architectures
    • H04N21/214—Specialised server platform, e.g. server located in an airplane, hotel, hospital
    • H04N21/2143—Specialised server platform, e.g. server located in an airplane, hotel, hospital located in a single building, e.g. hotel, hospital or museum
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4622—Retrieving content or additional data from different sources, e.g. from a broadcast channel and the Internet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/106—Adaptations for transmission by electrical cable for domestic distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests

Definitions

  • the present invention relates to local area network system for providing both
  • antenna television network installed on an apartment, a shopping district, a building, a school, a hotel, or an inn(a complex building, hereinafter) when they are built.
  • master antenna television network(MATV Network) is installed on
  • each of a complex building such as apartments, a building, a hotel, or a school to allow
  • master antenna television network means a single receiving system connecting various televisions in a
  • the local cable TV companies generally use optical
  • HFC Hybrid Fiber Coaxial Cable
  • Termination System 30.
  • the converted internet data is combined with the cable TV
  • the complex signal diverged by the directional coupler 1 10 is separated into internet signal and cable TV signal by a signal separating unit 120 and transmitted
  • the internet upward signal is input into the CMTS 30 through an optical receiver
  • internet service is generally provided by ADSL, home LAN, or cable modem wired on the outer wall, etc.
  • the object of the present invention is to provide local area network system for providing both internet service and additional service of LAN using master antenna
  • antenna television network installed in a complex building, comprising: a user's terminal
  • modem section forming interface for signal input/output between internet private lines and the master antenna television network for controlling input/output of internet upward
  • signal noise processing section comprising a high pass filter for removing noise come into said downward signal, a band pass filter for removing noise come into said upward signal, and an amplifier connected to a rear end of said band pass filter for
  • processing section is preferably disposed either between the user's terminal modem
  • said user's terminal modem section comprises a signal demodulation
  • said internet private line modem section comprises a signal
  • demodulation section for demodulating the upward signal and outputting; a signal
  • control section for controlling the process of modulation/demodulation of the signal
  • said signal noise processing section comprises plural sets of band pass
  • said signal noise processing section further comprises a mixer, disposed
  • said signal noise processing section further comprises diplex filters,
  • said signal noise processing section further comprises a level regulating section, connected to the rear end of said amplifier, for converting level of said upward
  • section further comprises a level measurement section for measuring level of the
  • Fig. 1 is a structural diagram of network for describing a method for providing internet service using the conventional HFC(Hybrid Fiber Coaxial) network
  • Fig. 2 is a block diagram of local area network system using master antenna
  • Fig. 3 is a block diagram of a signal noise processing section comprised in local
  • Fig. 4 is a block diagram of a level regulating section of the signal noise
  • processing section comprised in local area network system using master antenna
  • Fig. 2 is a block diagram of local area network system using master antenna
  • network according to the present invention relates to a system allowing using both of
  • internet private line modem section 210 forming interface for signal input/output between internet private lines 200 and the master antenna television
  • network 180 for controlling input/output of internet upward signal and LAN upward
  • processing section 220 comprising a high pass filter for removing noise come into the
  • the LAN downward signal means all the signals except
  • signal means all the signals except the internet upward signal among signals transmitted from the master antenna television network 180 to the internet private line
  • the upward signal means both of the internet upward
  • the signal noise processing section 220 is preferably disposed either between the user's terminal modem section 190 and the master antenna television network 180 or between the internet private line modem section 210 and the master antenna
  • the internet According to the local area network system of the present invention, the internet
  • private line modem section 210 comprises a control section 210a and a signal modulation/demodulation section 210b and 210c to function as a general internet
  • terminal modem section 190 comprises a control section 190a and a signal
  • modulation/demodulation section 190b and 190c for modulating interface signal for user, internet upward signal, LAN upward signal, response signal to control of the internet
  • control section 190a the control section 190a
  • a LAN card is disposed between the user's terminal 170 and the terminal modem section 190, and the LAN card
  • network 180 and the user's terminal 170 provides interface for user to the terminal
  • the signal is transmitted to the local area network system of the present invention.
  • the signal is transmitted to the local area network system of the present invention.
  • noise processing section 220 removes noise coming into upward signal and downward
  • television network 180 is as follows. It is reasonable for those skilled in the art to clearly and easily understand the structure and the operation of the signal noise processing
  • antenna television network 180 by the following description.
  • Fig. 3 is a block diagram of a signal noise processing section 220 disposed between the internet private line modem section 210 and the master antenna television
  • the signal noise processing section 220 comprises a high
  • a band pass filter 260 for removing noise of internet upward signal and LAN upward signal transmitted from
  • pass filter 260 for separating upward signal and downward signal to classify and filter
  • the band pass filter 260 for mixing intermediate frequency generated from a local
  • the upward signal wherefrom noise is removed by the band pass filter 260 to have original frequency zone by mixing the same with intermediate frequency provided from
  • the signal noise processing section 220 preferably comprises plural couples of
  • section 220 having structure as described above is as follows.
  • diplex filter 270 to remove noise of each signal.
  • the separated downward signal is filtered by the high pass filter 250 to remove noise except downward signal.
  • the downward signal wherefrom noise is removed is
  • the upward signal is separated by the diplex filter 270 and filtered by the band pass filter 260 to remove noise.
  • the upward signal separated by the diplex filter 270 is modulated to have
  • intermediate frequency zone by being mixed with intermediate frequency provided from
  • intermediate frequency zone is restored to the original level before the modulation by
  • the upward signal from which noise is removed by the band pass filter 260 is
  • the signal noise processing section 220 further comprises one or more sets of an amplifier
  • the S/N ratio may be maintained to be higher when the filtering of the upward signal is performed, it is possible to more trustworthily remove noise input into the upward signal.
  • the level regulating section 320 provides function of
  • ISP internet service provider
  • Fig. 4 is a block diagram of the level regulating section 320 comprised in the signal noise processing section 220 according to the present invention.
  • the level regulating section 320 comprises a limiter 330 for
  • electrolytic condenser for converting the meta current signal into voltage signal on an
  • control signal from the microcomputer 370 regulating the level of the filtered upward signal to the standard signal level, and outputting the signal to the diplex filter 270.
  • the signal noise processing section 220 comprises the level regulating section
  • internet service and LAN are provided.
  • additional service may be provided through the master antenna television network installed in complex buildings.
  • the master antenna television network installed in a complex building is used as the local area network not to cause social/economic cost, it is possible to provide inhabitants with internet service and LAN additional service at a lower price.
  • LAN additional service may be provided in an apartment where building of local area network is difficult, it may serve to harmonize inhabitants of the apartment and it is possible to digitalize the apartment managing system.

Abstract

A local area network system using master antenna television network allowing both of internet service and additional LAN service on plural terminals of users connected to the master antenna television network is disclosed. The local area network system comprises a user's terminal modem section disposed between the user's terminals and the master antenna television network and forming interface for signal inout/output; a internet private line modem section forming interface for signal input/output between internet private lines and the master antenna television network for controlling input/output of internet upward signal and LAN upward signal and internet downward signal and LAN downward signal and the user's terminal modem section when the additional service of LAN is provided; and a signal noise processing section comprising a high pass filter for removing noise come into said downward signal, a band pass filter for removing noise come into said upward signal, and an amplifier connected to a rear end of said band pass filter for restoring the upward signal level decreased by said band pass filter to the original signal level by amplifying the level of the filtered upward signal, wherein said signal noise processing section is preferably disposed either between the user's terminal modem section and the master antenna television network or between the internet private line modem section and the master antenna television network at least.

Description

LOCAL AREA NETWORK SYSTEM USING MASTER ANTENNA TELEVISION NETWORK
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to local area network system for providing both
internet service and additional service of LAN(Local Area Network) using master
antenna television network installed on an apartment, a shopping district, a building, a school, a hotel, or an inn(a complex building, hereinafter) when they are built.
(b) Description of the Related Art
Generally, master antenna television network(MATV Network) is installed on
each of a complex building such as apartments, a building, a hotel, or a school to allow
multiple households to watch programs of various channels. Here, master antenna television network means a single receiving system connecting various televisions in a
same building or an area where buildings are clustered close together, that is, cable
network allowing watching TV by building up a main antenna to distribute TV signal to
plural television sets.
Especially in an apartment complex where plural households are clustered,
there are frequent occasions that local cable TV companies are connected with the
master antenna television network. The local cable TV companies generally use optical
fiber cables to send TV signal from a cable radio relay station to nodes close to end users and coaxial cables to send TV signal from the nodes to set top boxes of end users. Such technique using both of optical fiber cables and coaxial cables in different
parts of network to send TV signal formed of video and audio data is called HFC(Hybrid Fiber Coaxial Cable) communication technique.
According to the HFC communication technique, signal with trustworthy
superior transmitting property of optical fiber cable may closely be transmitted to end
users without changing existing coaxial cables already installed on companies or homes.
In addition, according to the HFC communication technique, since the optical fiber cable is used as backbone pipe, more data may be transmitted in wide bandwidth than that
when only the coaxial cable is used to allow supporting mutual-directional data
transmitting service based on a server/client model. Further, since the optical fiber cable
installed on foundational facilities has higher trustworthiness than the coaxial cable, the same may more efficiently used for connecting networks of cable TV companies or
telephone companies. Accordingly, many cable TV companies and telephone
companies replace the conventional network with the HFC network in these days.
On the other hand, internet service is spread all over the country in these days
because technique for providing superhigh-speed internet service using basic network
of cable TV service, i.e. HFC network is commonly used. The detailed description of a
process of sending internet upward signal and downward signal through the HFC
network referring to Fig. 1 is as follows.
First, an internet data packet transmitted through the internet network 10
passes a router 20 and the internet data packet transmitted through the router 20 is converted into data receivable for a cable modem 40 through CMTS(Cable Modem
Termination System) 30. The converted internet data is combined with the cable TV
signal transmitted from a CATV transmitting station 60 and transmitted to the optical
network 80 through the optical transmitter 70 and the transmitted complex signal is transmitted to each building to which the internet service is to be provided via an optical network unit 90 and coaxial cable network 100 and through a directional coupler 1 10.
The complex signal diverged by the directional coupler 1 10 is separated into internet signal and cable TV signal by a signal separating unit 120 and transmitted
through each individual cable line and the internet signal of the separated signals is
converted into signal cognizable for a PC terminal 130 and input into the PC terminal
through a cable modem 40 and the cable TV signal is input into a television set 150 through a converter 140.
On the other hand, internet upward signal transmitted from a user's terminal
130 is input into the optical network unit 90 through coaxial cable network 100 via cable
modem 40, converged into fiber-optic signal, and transmitted to the optical network 80.
Then, the internet upward signal is input into the CMTS 30 through an optical receiver
160, converged into internet data packet, and transmitted to the internet network 10
through the router 20. However, when an internet upward/downward signal
transmitting model using the HFC network is applied to the master antenna
television(MATV) network built in a complex building such as apartments, it is impossible to transmit trustworthy internet data because of various unnecessary noises
coming into upward signal transmitted through the master antenna television network.
Accordingly, the internet service using the master antenna television network is not
provided in case of a complex building using the master antenna television network, the
internet service is generally provided by ADSL, home LAN, or cable modem wired on the outer wall, etc.
However, such methods comprise various defects. For example, problems that
it costs more to build a new network, the installation is complicated in case of a large apartment complex because every line for each home should be searched and then signal is come into each line, it is difficult to add additional equipments along with user's
increase, a space for placing headends is limited in case of the apartment since
headends would occupy more and more the space according to the increase of internet
service users, and noise coming into the upward signal affects much the internet
communication but it is impossible to effectively remove the noise.
SUMMARY OF THE INVENTION
The object of the present invention is to provide local area network system for providing both internet service and additional service of LAN using master antenna
television network already installed in a complex building without extra installation.
In order to achieve the above object, there is provided a local area network
system using master antenna television network allowing using both of internet service and additional service of LAN on plural terminals of users connected to the master
antenna television network installed in a complex building, comprising: a user's terminal
modem section disposed between the users' terminals and the master antenna
television network and forming interface for signal input/output; a internet private line
modem section forming interface for signal input/output between internet private lines and the master antenna television network for controlling input/output of internet upward
signal and LAN upward signal and internet downward signal and LAN downward signal
and the user's terminal modem section when the additional service of LAN is provided;
and signal noise processing section comprising a high pass filter for removing noise come into said downward signal, a band pass filter for removing noise come into said upward signal, and an amplifier connected to a rear end of said band pass filter for
restoring the upward signal level decreased by said band pass filter to the original signal level by amplifying the level of the filtered upward signal, wherein said signal noise
processing section is preferably disposed either between the user's terminal modem
section and the master antenna television network or between the internet private line
modem section and the master antenna television network at least.
In the local area network system using master antenna television network, it is
preferable that said user's terminal modem section comprises a signal demodulation
section for demodulating the downward signal and outputting; a signal modulation section for modulating the upward signal and outputting; and a modem control section
for controlling the process of modulation/demodulation of the signal and input/output of
the signal from/to the internet private line modem section to allow internet service and
LAN additional service to be possible.
In the local area network system using master antenna television network, it is preferable that said internet private line modem section comprises a signal
demodulation section for demodulating the upward signal and outputting; a signal
modulation section for modulating the downward signal and outputting; and a modem
control section for controlling the process of modulation/demodulation of the signal and
input/output of the signal from/to the internet private line modem section to allow
internet service and LAN additional service to be possible.
In the local area network system using master antenna television network, it is
preferable that said signal noise processing section comprises plural sets of band pass
filters and amplifiers.
In the local area network system using master antenna television network, it is preferable that said signal noise processing section further comprises a mixer, disposed
on the front end of said band pass filter, for modulating the upward signal by mixing the same with intermediate frequency generated from a local oscillator to allow the upward
signal to be filtered in the intermediate frequency zone.
In the local area network system using master antenna television network, it is
preferable that said signal noise processing section further comprises diplex filters,
disposed on the front ends of said high pass filter and said band pass filter, for
separating said upward and downward signals to allow filtering noise of said upward and downward signals after classifying into different frequent zone each other.
In the local area network system using master antenna television network, it is
preferable that said signal noise processing section further comprises a level regulating section, connected to the rear end of said amplifier, for converting level of said upward
signal into a predetermined standard level. It is preferable that said level regulating
section further comprises a level measurement section for measuring level of the
upward signal input into said level regulating section and comparing the measured level
with a predetermined standard level and a level converting section for converting the level of said upward signal into the predetermined standard level.
BRIEF DESCRIPTION OF THE DRAWINGS
A more complete appreciation of the invention, and many of the attendant
advantages thereof, will be readily apparent as the same becomes better understood by
reference to the following detailed description when considered in conjunction with the
accompanying drawings in which like reference symbols indicate the same or the similar
components, wherein:
Fig. 1 is a structural diagram of network for describing a method for providing internet service using the conventional HFC(Hybrid Fiber Coaxial) network; Fig. 2 is a block diagram of local area network system using master antenna
television network according to an embodiment of the present invention;
Fig. 3 is a block diagram of a signal noise processing section comprised in local
area network system using master antenna television network according to an
embodiment of the present invention; and
Fig. 4 is a block diagram of a level regulating section of the signal noise
processing section comprised in local area network system using master antenna
television network according to the present invention.
EMBODIMENT
The detailed description of the present invention referring to the experimental examples and embodiments is provided hereinafter. However, the embodiments
according to the present invention can be modified in various ways and the claims of the
present invention should not be understood to be restricted to the embodiments
described below. The embodiments of the present invention are provided to more
clearly and easily describe the present invention to a person who has standard
knowledge in this technical area. In drawings, the identified references designate the
identified elements.
Fig. 2 is a block diagram of local area network system using master antenna
television network according to an embodiment of the present invention.
Referring to Fig. 2, local area network system using master antenna television
network according to the present invention relates to a system allowing using both of
internet service and additional service of LAN on plural terminals 170 of users
connected to the master antenna television network installed in a complex building and comprises a user's terminal modem section 190 disposed between the users' terminals
170 and the master antenna television network 180 and forming interface for signal
input/output; a internet private line modem section 210 forming interface for signal input/output between internet private lines 200 and the master antenna television
network 180 for controlling input/output of internet upward signal and LAN upward
signal and internet downward signal and LAN downward signal and the user's terminal
modem section 190 when the additional service of LAN is provided; and a signal noise
processing section 220 comprising a high pass filter for removing noise come into the
internet downward signal and LAN downward signal, a band pass filter for removing
noise come into the internet upward signal and LAN upward signal, and an amplifier
connected to a rear end of the band pass filter for restoring the upward signal level
decreased by the band pass filter to the original signal level by amplifying the level of the filtered upward signal. Here, the LAN downward signal means all the signals except
the internet downward signal among signals transmitted from the internet private line
modem section 210 to the master antenna television network 180 and the LAN upward
signal means all the signals except the internet upward signal among signals transmitted from the master antenna television network 180 to the internet private line
modem section 210. Hereinafter, the upward signal means both of the internet upward
signal and the LAN upward signal and the downward signal means both of the internet
downward signal and the LAN downward signal as far as there is no special comment.
The signal noise processing section 220 is preferably disposed either between the user's terminal modem section 190 and the master antenna television network 180 or between the internet private line modem section 210 and the master antenna
television network 180 at least. The more particular description of structure and operation of the signal noise processing section 220 referring to drawings follows later.
According to the local area network system of the present invention, internet
downward signal from a remote server 230 providing web service, mail service, FTP
service, etc. to users' terminals 170 enters through the internet private line 200 and is transmitted to each terminal 170 of a user who requests service and internet upward
signal from the users' terminals 170 to the remote server 230 is transmitted through the
internet private line 200 via master antenna television network 180.
According to the local area network system of the present invention, the internet
private line modem section 210 comprises a control section 210a and a signal modulation/demodulation section 210b and 210c to function as a general internet
private modem used for building LAN, and performs the operations such as controlling
incoming/outgoing and on/off of upward/downward signal through the internet private
line 200; modulating internet downward signal transmitted from the remote server 230 to the master antenna television network 180; demodulating internet upward signal
transmitted from the master antenna television network 180 to the remote server 230;
demodulating LAN upward signal; modulating LAN downward signal; controlling signal
traffic; managing TCP/IP; controlling the terminal modem section 190 connected to a user's terminal 170 on LAN built on the basis of the master antenna television network
180; and managing addresses of users' terminals 170.
According to the local area network system of the present invention, the user's
terminal modem section 190 comprises a control section 190a and a signal
modulation/demodulation section 190b and 190c for modulating interface signal for user, internet upward signal, LAN upward signal, response signal to control of the internet
private line modem section 210, self-diagnosis signal, etc. and transmitting the same to the private line modem section 210, and demodulating control signal of the user's
terminal modem section 190 transmitted from the internet private modem section 190,
internet downward signal, LAN downward signal, etc. Here, the control section 190a
controls signals demodulated by the signal modulation/demodulation section 190b and
190c, and provides interface for users. On the other hand, a LAN card is disposed between the user's terminal 170 and the terminal modem section 190, and the LAN card
converts protocol between the LAN built on the basis of the master antenna television
network 180 and the user's terminal 170 and provides interface for user to the terminal
170. According to the local area network system of the present invention, the signal
noise processing section 220 removes noise coming into upward signal and downward
signal. The detailed description of the signal noise processing section 220 referring to
Fig. 2 and Fig. 3, especially focusing on the signal noise processing section 220
disposed between the internet private line modem section 210 and the master antenna
television network 180 is as follows. It is reasonable for those skilled in the art to clearly and easily understand the structure and the operation of the signal noise processing
section 220 disposed between the user's terminal modem section 190 and the master
antenna television network 180 by the following description.
Fig. 3 is a block diagram of a signal noise processing section 220 disposed between the internet private line modem section 210 and the master antenna television
network 180 of the local area network system according to the present invention.
According to Fig. 3, the signal noise processing section 220 comprises a high
pass filter 250 for removing noise of internet downward signal and LAN downward
signal modulated in the internet private line modem section 210; a band pass filter 260 for removing noise of internet upward signal and LAN upward signal transmitted from
the user's terminal 170 through the master antenna television network 180; diplex filters
270 respectively disposed on the front ends of the high pass filter 250 and the band
pass filter 260 for separating upward signal and downward signal to classify and filter
noise of upward signal and downward signal; a first mixer 290a disposed on the front of
the band pass filter 260 for mixing intermediate frequency generated from a local
oscillator 280 and upward signal to filter the upward signal in the intermediate frequency zone; an amplifier 300 for restoring signal level decreased due to modulation into
intermediate frequency by the first mixer 290a; a second mixer 290b for demodulating
the upward signal wherefrom noise is removed by the band pass filter 260 to have original frequency zone by mixing the same with intermediate frequency provided from
the local oscillator 280; an amplifier 310 disposed on the rear of the band pass filter 260
for amplifying decreased level of the filtered upward signal to be restored to the original
level; and a level regulating section 320 for converting level of the upward signal output
from the amplifier 310 into the predetermined basic level. The signal noise processing section 220 according to the present invention preferably comprises plural couples of
amplifiers for compensating signal level and band pass filters on both ends of the band
pass filter 260 shown in Fig. 3. In this case, it is more effective to remove noise of
upward signal. By the signal noise processing section 220, downward signal is filtered
to have a certain frequency zone, for example, 55~750MHz and upward signal is filtered
to have a certain frequency zone, for example 5~42MHz without noise.
The detailed description about the operation of the signal noise processing
section 220 having structure as described above is as follows.
Since upward/downward signals sent/received on the master antenna television network 180 are classified into different frequency zones and transmitted through one
coaxial cable, upward signal and downward signal are separated from each other by the
diplex filter 270 to remove noise of each signal.
The separated downward signal is filtered by the high pass filter 250 to remove noise except downward signal. The downward signal wherefrom noise is removed is
transmitted to the user's terminal 170 through the master antenna television network
180. On the other hand, since noise generated from various kinds of electric
apparatuses and devices generating electronic wave flows into upward signal when the
signal is transmitted to the master antenna television network 180 formed of coaxial cables, signal/noise ratio(S/N ratio) considerably decreases and loss rate of data rapidly
increases. Accordingly it becomes impossible to transmit trustworthy signal through the
master antenna television network 180. For this reason, the upward signal is separated by the diplex filter 270 and filtered by the band pass filter 260 to remove noise.
The process of removing noise of upward signal is particularly described
hereinafter. The upward signal separated by the diplex filter 270 is modulated to have
intermediate frequency zone by being mixed with intermediate frequency provided from
the local oscillator 280 in the first mixer 290a. The reason why the upward signal is modulated to have intermediate frequency before filtering noise is to allow the filtering to
be easy and precise. The upward signal having decreased signal level by the modulation into
intermediate frequency zone is restored to the original level before the modulation by
being amplified through the amplifier 300 and filtered by the band pass filter 260 to
remove noise. Here, it is preferable to use a SAW filter having high quality of passing
property and ability of perfectly excluding unnecessary band of signal as the band pass filter 260.
The upward signal from which noise is removed by the band pass filter 260 is
demodulated to have the original frequency band by being mixed with the intermediate
frequency provided from the local oscillator 280 in the second mixer 290b. The upward
signal from which noise is removed by the band pass filter 260 and demodulated to have the original frequency band by the second mixer 290b is amplified again by the amplifier 310 to restore the signal level decreased by the second mixer 290b and
transmitted to the internet private line modem section 210 via the level regulating
section 320 and the diplex filter 270. According to the signal noise processing section 220 of the present invention, it
is preferable to use a DBM(Double Balanced Mixer), as the first and the second mixers
290a and 290b, having ability to minimize noise of the local oscillator 280 and superior
property of isolation of RF(Radio Frequency), IF(lntermediate Frequency), and LO(Local
Oscillator) from each other.
In addition, it is preferable that the signal noise processing section 220 according to the present invention further comprises one or more sets of an amplifier
and a band pass filter on an output end of the band pass filter 260. In this case, since
the S/N ratio may be maintained to be higher when the filtering of the upward signal is performed, it is possible to more trustworthily remove noise input into the upward signal.
On the other hand, the level regulating section 320 provides function of
converting the upward frequency zone to various frequency zones of the upward signal
used by plural internet service provider(ISP) when the internet service is provided
through the HFC network.
Fig. 4 is a block diagram of the level regulating section 320 comprised in the signal noise processing section 220 according to the present invention.
Referring to Fig. 4, the level regulating section 320 comprises a limiter 330 for
cutting off the input of signal having level higher than a certain degree; a detector 340
for generating meta current signal indicating strength of upward signal after receiving
signal output from the limiter 330; a converting section 350(formed of resistance and an
electrolytic condenser) for converting the meta current signal into voltage signal on an
output end of the detector 340; an A/D converter(Analog to Digital Converter) 360 for
converting analog voltage signal into digital upward signal level; a microcomputer 370
for comparing the digital upward signal level with a predetermined upward signal level
and generating level control signal when the levels do not agree with each other in the allowable difference range; and a level converting section 380 for receiving the level
control signal from the microcomputer 370, regulating the level of the filtered upward signal to the standard signal level, and outputting the signal to the diplex filter 270.
If the signal noise processing section 220 comprises the level regulating section
320 having the above-described structure, it is possible to tune the upward signal to the
internet upward signal frequency zone used by the ISP(lntemet Service Provider)
operating the internet network when the internet service is provided using the local area
network system according to the present invention.
While the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications
and substitutions can be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.
According to an aspect of the present invention, internet service and LAN
additional service may be provided through the master antenna television network installed in complex buildings.
According to another aspect of the present invention, since the master antenna television network installed in a complex building is used as the local area network not to cause social/economic cost, it is possible to provide inhabitants with internet service and LAN additional service at a lower price.
According to another aspect of the present invention, since LAN additional service may be provided in an apartment where building of local area network is difficult, it may serve to harmonize inhabitants of the apartment and it is possible to digitalize the apartment managing system.

Claims

WHAT IS CLAIMED IS:
1. Local area network system using master antenna television network
allowing using both of internet service and additional service of LAN on plural terminals
of users connected to the master antenna television network installed in a complex
building, comprising:
(a) a user's terminal modem section disposed between the users'
terminals and the master antenna television network and forming interface for signal
input/output;
(b) a internet private line modem section forming interface for signal
input/output between internet private lines and the master antenna television network
for controlling input/output of internet upward signal and LAN upward signal and internet
downward signal and LAN downward signal and the user's terminal modem section when the additional service of LAN is provided; and
(c) a signal noise processing section comprising a high pass filter for
removing noise come into said downward signal, a band pass filter for removing noise
come into said upward signal, and an amplifier connected to a rear end of said band
pass filter for restoring the upward signal level decreased by said band pass filter to the
original signal level by amplifying the level of the filtered upward signal, wherein said
signal noise processing section is preferably disposed either between the user's
terminal modem section and the master antenna television network or between the
internet private line modem section and the master antenna television network at least.
2. The system according to claim 1 , wherein said user's terminal modem
section comprises a signal demodulation section for demodulating the downward signal and outputting; a signal modulation section for modulating the upward signal and outputting; and a modem control section for controlling the process of modulation/demodulation of the signal and input/output of the signal from/to the internet private line modem section to allow internet service and LAN additional service to be possible.
3. The system according to claim 1 , wherein said internet private line modem section comprises a signal demodulation section for demodulating the upward signal and outputting; a signal modulation section for modulating the downward signal and outputting; and a modem control section for controlling the process of modulation/demodulation of the signal and input/output of the signal from/to the internet private line modem section to allow internet service and LAN additional service to be possible.
4. The system according to claim 1 , wherein said signal noise processing section comprises plural sets of band pass filters and amplifiers.
5. The system according to claim 1 , wherein said signal noise processing
section further comprises a mixer, disposed on the front end of said band pass filter, for
modulating the upward signal by mixing the same with intermediate frequency
generated from a local oscillator to allow the upward signal to be filtered in the
intermediate frequency zone.
6. The system according to claim 1 , wherein said signal noise processing section further comprises diplex filters, disposed on the front ends of said high pass filter and said band pass filter, for separating said upward and downward signals to allow filtering noise of said upward and downward signals after classifying into different frequent zone each other.
7. The system according to claim 1 , wherein said signal noise processing section further comprises a level regulating section, connected to the rear end of said amplifier, for converting level of said upward signal into a predetermined standard level.
8. The system according to claim 7, wherein said level regulating section further comprises a level measurement section for measuring level of the upward signal input into said level regulating section and comparing the measured level with a predetermined standard level and a level converting section for converting the level of said upward signal into the predetermined standard level.
PCT/KR2002/000429 2001-03-12 2002-03-12 Local area network system using master antenna television network WO2002087166A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2001/12773 2001-03-12
KR1020010012773A KR20020072753A (en) 2001-03-12 2001-03-12 Local area communication system using public announcement network

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WO2002087166A1 true WO2002087166A1 (en) 2002-10-31

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KR20030073892A (en) * 2002-03-13 2003-09-19 주식회사 덱스터커뮤니케이션 Local area network system using master antenna television network

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KR100611408B1 (en) 2006-08-09
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