KR100406356B1 - Apparatus for switching with multi-input and multi-output and receiving apparatus with there - Google Patents
Apparatus for switching with multi-input and multi-output and receiving apparatus with there Download PDFInfo
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- KR100406356B1 KR100406356B1 KR10-2001-0084599A KR20010084599A KR100406356B1 KR 100406356 B1 KR100406356 B1 KR 100406356B1 KR 20010084599 A KR20010084599 A KR 20010084599A KR 100406356 B1 KR100406356 B1 KR 100406356B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
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- 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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
- H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
- H04N21/42638—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners involving a hybrid front-end, e.g. analog and digital tuners
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- 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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42676—Internal components of the client ; Characteristics thereof for modulating an analogue carrier signal to encode digital information or demodulating it to decode digital information, e.g. ADSL or cable modem
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
Abstract
본 발명은 다수의 입력단과 다수의 출력단을 구비하고 외부 제어신호에 따라 다수의 입력단에서 다수의 출력단으로서 신호흐름을 제어하도록 구성된 멀티 입출력 스위칭 장치에 관한 것으로, 본 발명에 의한 장치는 안테나단에 연결되는 제1입력단과, 케이블에 연결되는 제2입력단과, 상기 제1입력단으로 인가된 신호를 두 신호로 분배하는 제1스플리터회로부와, 상기 제2입력단으로 인가된 신호를 두 신호로 분배하는 제2스플리터회로부와, 상기 제2스플리터회로부의 한 분배단에 연결되어 입력신호를 두 신호로 분배하는 제3스플리터회로부와, 상기 제2스플리터회로부의 다른 분배단에 연결되는 루프쓰루아웃풋단과, 외부제어신호에 의해 스위칭동작하여 상기 제1,3스플리터회로부 각각의 제1분배단들중 하나를 출력단에 연결하는 제1스위칭회로부와, 외부제어신호에 의해 스위칭동작하여 상기 제1,3스플리터회로부 각각의 제2분배단들중 하나를 출력단에 연결하는 제2스위칭회로부와, 상기 제1,2스위칭회로부의 출력에 각각 연결된 제1,2출력단으로 구성된다.The present invention relates to a multi-input / output switching device having a plurality of inputs and a plurality of outputs and configured to control a signal flow from a plurality of inputs to a plurality of outputs in accordance with an external control signal. A first splitter circuit unit for distributing a signal applied to the first input terminal, a second input terminal connected to a cable, a signal applied to the first input terminal into two signals, and a second signal to distribute the signal applied to the second input terminal into two signals A second splitter circuit section, a third splitter circuit section connected to one distribution end of the second splitter circuit section for distributing an input signal into two signals, a loop through output stage connected to another distribution end of the second splitter circuit section, and external control A first switching circuit unit for switching one of the first distribution terminals of each of the first and third splitter circuit units to an output terminal by switching by a signal; A second switching circuit unit for switching one of the second distribution terminals of each of the first and third splitter circuit units to an output terminal by a switching operation by an external control signal, and first and second outputs connected to the outputs of the first and second switching circuit units, respectively. It consists of 2 output stages.
Description
본 발명은 디지탈 방송, 케이블방송, 위성방송등 다양한 방송을 수신하기 위한 수신시스템에 구비되어 방송신호를 스위칭입출력하는 스위칭장치에 관한 것으로, 보다 상세하게는 멀티입력단과 멀티출력단을 구비하여 입력단으로 인가된 방송신호를 외부 제어에 의해 선택된 출력단으로 출력시키도록 구성된 멀티 입출력 스위칭 장치 및 이를 내장한 방송 수신 장치에 관한 것이다.The present invention relates to a switching device provided in a receiving system for receiving a variety of broadcasts such as digital broadcasting, cable broadcasting, satellite broadcasting, and switching input / output of a broadcast signal, and more particularly, having a multi-input stage and a multi-output stage applied to an input stage. The present invention relates to a multi-input / output switching device and a broadcast receiving device including the same, configured to output the broadcast signal to an output terminal selected by an external control.
최근, 지상파 방송뿐만아니라, 케이블 방송이나, 위성방송등 다양한 전송매체를 통해 다양한 프로그램이 전송되고 있는데, 이렇게 전송매체가 다른 방송프로그램을 수신하기 위해서는 각각의 전송방식에 따라 방송신호를 수신하는 각각의 수신기를 구비하여야 한다.Recently, various programs are transmitted through various transmission media such as cable broadcasting and satellite broadcasting as well as terrestrial broadcasting. In order for the transmission media to receive different broadcasting programs, each program receiving a broadcasting signal according to each transmission scheme is used. A receiver should be provided.
또한, 방송수신과 관련된 다양한 가전기기들, 예를 들어, 수신된 방송프로그램을 테이프에 녹화하는 VTR등이 사용되고 있다.In addition, various home appliances related to broadcast reception, for example, a VTR for recording a received broadcast program on a tape and the like are used.
그렇기 때문에, 안테나 및/또는 케이블에 연결되는 장치의 수가 점점 많아지고 있다. 따라서, 안테나 또는 케이블을 통해 입력된 다양한 방식의 방송신호를 해당 수신장치로 인가하는 분배장치가 필요하다.As such, the number of devices connected to antennas and / or cables is increasing. Accordingly, there is a need for a distribution device that applies various types of broadcast signals input through an antenna or cable to a corresponding receiver.
도 1은 기존의 수신시스템에서 다수 장치의 연결 구성을 보인 것으로서, 안테나(ANT) 및 케이블(CABLE)단에, 입력된 두 신호 중 하나를 선택적으로 출력하는 스위칭블럭(11)을 연결하고, 상기 스위칭블럭(11)의 출력단에 디지탈방송신호를 수신하는 디지탈튜너(12)를 연결하고, 상기 디지탈튜너(12)의 방송수신신호 분배출력단에 아날로그방송신호를 수신처리하는 아날로그튜너(13)를 연결하고, 상기 아날로그튜너(13)의 방송수신신호 분배출력단에 VTR(14)을 연결한다.1 illustrates a connection configuration of a plurality of devices in a conventional receiving system, and connects a switching block 11 for selectively outputting one of two input signals to an antenna ANT and a cable end, and A digital tuner 12 for receiving a digital broadcast signal is connected to an output terminal of the switching block 11 and an analog tuner 13 for receiving and processing an analog broadcast signal to a broadcast receiving signal distribution output terminal of the digital tuner 12. The VTR 14 is connected to the broadcast reception signal distribution output terminal of the analog tuner 13.
상기와 같이, 종래에는 스위칭박스(11)로부터 출력된 지상파방송신호 또는 케이블방송신호는 디지탈튜너(12)의 분배회로를 거쳐 아날로그튜너(13)로 전달되고, 또한 아날로그튜너(13)의 분배회로를 거쳐 VTR(14)로 인가된다.As described above, in the related art, the terrestrial broadcast signal or cable broadcast signal output from the switching box 11 is transmitted to the analog tuner 13 through the distribution circuit of the digital tuner 12, and also the distribution circuit of the analog tuner 13. Is applied to the VTR 14 via.
따라서, VTR(14)에 입력되는 방송수신신호는 여러 단의 분배회로를 거침으로서 로스가 많이 발생한 신호가 되며, 따라서, 신호로스로 인한 화질저하가 필연적으로 발생된다.Therefore, the broadcast reception signal input to the VTR 14 becomes a signal that a lot of loss occurs through the distribution circuit of several stages, and therefore, the image quality degradation due to the signal loss inevitably occurs.
상기와 같은 분배과정에서 나타나는 신호로스를 줄이기 위하여, 외부에 별도의 분배장치를 구성할 수 도 있으나, 이는 비용상승 및 소비자기 조작하기 어렵게 된다는 문제점을 발생시킨다.In order to reduce the signal loss appearing in the distribution process as described above, a separate distribution device may be configured externally, but this causes a problem that the cost rise and consumer equipment becomes difficult to operate.
본 발명은 상술한 종래의 문제점을 해결하기 위하여 제안된 것으로서, 그 목적은 다수의 입력단과 다수의 출력단을 구비하고 외부 제어신호에 따라 다수의 입력단에서 다수의 출력단으로서 신호흐름을 제어하도록 구성된 멀티 입출력 스위칭 장치 및 이를 내장한 방송 수신 장치를 제공하는데 있다.SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is to include a plurality of input terminals and a plurality of output terminals, and to configure a signal flow as a plurality of output terminals at a plurality of input terminals according to an external control signal. The present invention provides a switching device and a broadcast receiving device having the same.
도 1은 종래 다양한 방송을 수신하기 위한 연결구성을 보인 블럭도이다.1 is a block diagram showing a connection configuration for receiving a variety of conventional broadcast.
도 2는 본 발명에 의한 멀티 입출력 스위칭장치를 이용한 수신시스템을 나타낸 블럭구성도이다.2 is a block diagram illustrating a receiving system using a multi-input / output switching device according to the present invention.
도 3은 본 발명에 의한 멀티 입출력 스위칭장치의 내부 구성을 보인 블럭도이다.3 is a block diagram showing an internal configuration of a multi-input / output switching device according to the present invention.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
21a, 21b : 제1,2입력단21a, 21b: first and second input terminals
21c, 21d : 제1,2출력단21c, 21d: First and second output terminal
21e : 루프쓰루아웃풋21e loop output
211 ~ 213 : 제1~제3스플리터회로부211 to 213: first to third splitter circuits
214, 215 : 제1,2스위칭회로부214, 215: first and second switching circuit
본 발명은 상술한 목적을 달성하기 위한 구성수단으로서, 멀티 입출력 스위칭 장치에 있어서,The present invention provides a multi-input and output switching device as a configuration means for achieving the above object,
안테나단에 연결되는 제1입력단;A first input terminal connected to the antenna terminal;
케이블에 연결되는 제2입력단;A second input terminal connected to the cable;
상기 제1입력단으로 인가된 신호를 두 신호로 분배하는 제1스플리터회로부;A first splitter circuit unit for distributing the signal applied to the first input terminal into two signals;
상기 제2입력단으로 인가된 신호를 두 신호로 분배하는 제2스플리터회로부;A second splitter circuit unit for distributing the signal applied to the second input terminal into two signals;
상기 제2스플리터회로부의 한 분배단에 연결되어 입력신호를 두 신호로 분배하는 제3스플리터회로부;A third splitter circuit part connected to one distribution end of the second splitter circuit part to distribute an input signal into two signals;
상기 제2스플리터회로부의 다른 분배단에 연결되는 루프쓰루아웃풋단;A loop through output stage connected to another distribution stage of the second splitter circuit unit;
외부제어신호에 의해 스위칭동작하여 상기 제1,3스플리터회로부 각각의 제1분배단들중 하나를 출력단에 연결하는 제1스위칭회로부;A first switching circuit unit configured to switch by an external control signal to connect one of the first distribution terminals of each of the first and third splitter circuit units to an output terminal;
외부제어신호에 의해 스위칭동작하여 상기 제1,3스플리터회로부 각각의 제2분배단들중 하나를 출력단에 연결하는 제2스위칭회로부; 및A second switching circuit unit configured to switch by an external control signal to connect one of the second distribution terminals of each of the first and third splitter circuit units to an output terminal; And
상기 제1,2스위칭회로부의 출력에 각각 연결된 제1,2출력단으로 구성되는 것을 특징으로 한다.And first and second output terminals respectively connected to outputs of the first and second switching circuit units.
이하, 첨부한 도면을 참조하여 본 발명에 의한 멀티 입출력 스위칭 장치의 구성 및 작용에 대하여 상세하게 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the multi-input and output switching device according to the present invention.
도 3은 본 발명에 의한 멀티 입출력 스위칭 장치(21)를 도시한 블럭구성도로서, 안테나단(ANT)에 연결되는 제1입력단(21a)과, 케이블(CABLE)에 연결되는 제2입력단(21b)과, 상기 제1입력단(21a)으로 인가된 신호를 두개의 신호로 분배하는 제1스플리터회로부(211)과, 상기 제2입력단(21b)으로 인가된 신호를 두개의 신호로 분배하는 제2스플리터회로부(212)와, 상기 제2스플리터회로부(212)의 한 분배단에 연결되어 입력신호를 두개의 신호로 분배하는 제3스플리터회로부(213)와, 상기 제1,3스플리터회로부(211,213) 각각의 제1분배단들중 하나를 출력단에 연결하는 제1스위칭회로부(214)와, 외부 제어신호에 의해 스위칭동작하여 상기제1,3스플리터회로부(211,213) 각각의 제2분배단들중 하나를 출력단에 연결하는 제2스위칭회로부(215)와, 외부 제어신호에 의해 스위칭동작하여 상기 제1, 2스위칭회로부(214, 215)의 출력에 각각 연결된 제1,2출력단(21c,21d)과, 상기 제2스플리터회로부(212)의 다른 분배단에 연결되는 루프쓰루아웃풋단(21e)으로 이루어진다.FIG. 3 is a block diagram illustrating a multi-input / output switching device 21 according to the present invention, and includes a first input terminal 21a connected to an antenna terminal ANT and a second input terminal 21b connected to a cable. ), A first splitter circuit unit 211 for distributing the signal applied to the first input terminal 21a into two signals, and a second for distributing the signal applied to the second input terminal 21b as two signals. A splitter circuit portion 212, a third splitter circuit portion 213 connected to one distribution terminal of the second splitter circuit portion 212 for distributing an input signal into two signals, and the first and third splitter circuit portions 211 and 213. A first switching circuit unit 214 for connecting one of the first distribution terminals to an output terminal, and one of the second distribution terminals of each of the first and third splitter circuit units 211 and 213 by switching by an external control signal. Switching operation by an external control signal and a second switching circuit portion 215 for connecting the First and second output terminals 21c and 21d connected to the outputs of the first and second switching circuit units 214 and 215, respectively, and a loop through output stage 21e connected to other distribution terminals of the second splitter circuit unit 212. )
상기에서, 제1,2,3스플리터회로부(211~213)는 발룬(balun)이나 인덕터, 저항, 캐패시터등을 이용하여 구성되고, 노이즈값(NF)나 게인을 보상하고, 차폐능 개선등을 위하여 다이오드, 트랜지스터등의 능동소자를 추가하여 구성할 수 도 있다.In the above description, the first, second, and third splitter circuits 211 to 213 are configured by using a balun, an inductor, a resistor, a capacitor, and the like, to compensate for the noise value NF and the gain, and to improve the shielding performance. For this purpose, an active element such as a diode or a transistor may be added.
그리고, 상기 제1,2스위칭회로부(214,215)는 다이오드나 트랜지스터, 전계효과트랜지스터(FET), 캐패시터, 인덕터등으로 구성될 수 있으며, 스위칭기능외에 게인보상이나 차폐기능 개선을 위해 증폭기(amp)나 버퍼등을 이용할 수 도 있다.The first and second switching circuits 214 and 215 may be composed of a diode, a transistor, a field effect transistor (FET), a capacitor, an inductor, and the like. In addition to the switching function, an amplifier or amplifier may be used to improve gain compensation or shielding function. You can also use a buffer.
도 2는 본 발명에 따른 스위칭 장치를 이용하여 수신장치를 연결한 예를 보인 도면으로서, 본 발명에 의한 멀티 입출력 스위칭 장치(21)의 제1입력단(21a)은 안테나에 연결되고, 제2입력단(21b)는 케이블에 연결되며, 상기 제1출력단(21c)은 아날로그/디지탈겸용 튜너(22)에 연결하며, 상기 제2출력단(21d)은 VTR(23)에 연결하고, 상기 루프쓰루아웃풋단(21e)은 케이블모뎀 또는 웹박스(24)에 연결한다.2 is a view showing an example in which a receiving device is connected using a switching device according to the present invention. The first input terminal 21a of the multi-input / output switching device 21 according to the present invention is connected to an antenna, and the second input terminal. 21b is connected to a cable, and the first output terminal 21c is connected to the analog / digital tuner 22, and the second output terminal 21d is connected to the VTR 23, and the loop through output stage. 21e connects to a cable modem or web box 24.
상기 본 발명에 의한 멀티 입출력 스위칭 장치의 동작을 상기 도 2와 같은 적용예를 참조하여 설명한다.The operation of the multi-input / output switching device according to the present invention will be described with reference to the application example as shown in FIG.
상기 제1스플리터회로부(211)은 제1입력단(21a)으로 입력된 아날로그 또는 디지탈 방식의 지상파 방송수신신호를 두개의 신호로 분배한다.The first splitter circuit 211 distributes an analog or digital terrestrial broadcast signal received through the first input terminal 21a into two signals.
그리고, 제3스플리터회로부(213)는 제2스플리터회로부(212)를 통해 인가도니제2입력단(21B)의 입력신호(즉, 케이블 방송 수신신호)를 두개의 신호로 분배한다.The third splitter circuit 213 distributes the input signal (ie, the cable broadcast reception signal) of the second input terminal 21B to the two signals through the second splitter circuit 212.
그리고, 제1스위칭회로부(214)는 외부 제어신호(전압2)에 따라서 스위칭동작하여 상기 제1스플리터회로부(211)의 제1분배신호와 제3스플리터회로부(211)의 제1분배신호중 하나를 제1출력단(21c)으로 인가한다.In addition, the first switching circuit unit 214 switches according to an external control signal (voltage 2) so as to switch one of the first divided signal of the first splitter circuit unit 211 and the first divided signal of the third splitter circuit unit 211. To the first output terminal 21c.
또한, 제2스위칭회로부(215)는 외부 제어신호(전압1)에 따라서 스위칭동작하여 상기 제1스플리터회로부(211)의 제2분배신호와 제3스플리터회로부(211)의 제2분배신호중 하나를 제2출력단(21d)으로 인가한다.In addition, the second switching circuit unit 215 is switched according to an external control signal (voltage 1) so that one of the second divided signal of the first splitter circuit unit 211 and the second divided signal of the third splitter circuit unit 211 is switched. To the second output terminal 21d.
따라서, 제1출력단(21c)과 제2출력단(21d) 각각에서 지상파 방송신호나 케이블방송신호가 출력될 수 있다.Therefore, the terrestrial broadcast signal or the cable broadcast signal may be output from each of the first output terminal 21c and the second output terminal 21d.
상기 도 2에서는 제1출력단(21c)에 아날로그/디지탈 겸용 튜너(22)를 연결하였으므로, 상기 제1스위칭회로부(214)가 제1스플리터회로부(211)의 제1분배신호, 즉, 지상파방송수신신호를 출력하도록 외부제어전압(전압2)를 인가한다.In FIG. 2, since the analog / digital tuner 22 is connected to the first output terminal 21c, the first switching circuit 214 receives the first divided signal of the first splitter circuit 211, that is, terrestrial broadcast reception. An external control voltage (voltage 2) is applied to output a signal.
그리고, 제2출력단(21d)에는 VTR(23)이 연결되어 있는데, 상기 VTR(23)은 케이블 방송이나 지상파방송에 관계없이 연결될 수 있으므로, 상기 제1출력단(21d)과 동일한 신호, 즉, 지상파방송수신신호(제1스플리터회로부(213)의 제2분배신호)를 선택출력하도록 제어신호(전압1)를 인가할 수 도 있고, 케이블방송신호(제2스플리터회로부(214)의 제2분배신호)를 선택출력하도록 제어신호(전압1)를 인가할 수 도 있다.The VTR 23 is connected to the second output terminal 21d. Since the VTR 23 can be connected regardless of cable broadcasting or terrestrial broadcasting, the same signal as that of the first output terminal 21d, that is, terrestrial wave, is connected. The control signal (voltage 1) may be applied to selectively output the broadcast reception signal (the second divided signal of the first splitter circuit unit 213), or the cable broadcast signal (the second divided signal of the second splitter circuit unit 214). ) May be applied to the control signal (voltage 1).
즉, 수신시스템의 구성에 따라 제1,2출력단(21c,21d)로 출력되는 신호를 다양하게 선택할 수 있다.That is, the signals output to the first and second output terminals 21c and 21d may be variously selected according to the configuration of the receiving system.
그리고, 루프쓰루아웃풋(21e)은 상기 제2입력단(21b)에 연결된 케이블을 통해 양방향 통신시 사용하는 단자로서, 데이타를 송수신하는 케이블모뎀이나 웹박스(24)와 연결되어, 상기 루프쓰루아웃풋(21e)으로 입출력되는 데이타는 사익 케이블방송신호와는 사용대역이 다르므로 상기 케이블방송신호의 수신과는 관계없이 제2스플리터회로부(212)를 통해 제2입력단(21b)로 출력되어 케이블로 전달된다.The loop through output 21e is a terminal used for bidirectional communication through a cable connected to the second input terminal 21b. The loop through output 21e is connected to a cable modem or a web box 24 for transmitting and receiving data. 21e) and the data input and output is different from the use of the cable cable broadcast signal, so that regardless of the reception of the cable broadcast signal is output to the second input terminal 21b through the second splitter circuit 212 and transmitted to the cable. .
상기와 같은 멀티 입출력 스위칭장치는 별도의 모듈로 구현될 수 있으며, 또한, 기존의 수신 장치(예를 들어, 디지탈방송 튜너 또는 디모듈레이터등)에 일체화된 형태로 구현될 수 있다.The multi-input and output switching device as described above may be implemented as a separate module, it may also be implemented in an integrated form of an existing receiving device (for example, digital broadcast tuner or demodulator).
상술한 바와 같이, 본 발명은 다수의 입력단과 다수의 출력단을 구비하고, 상기 다수의 입력단의 신호가 사용자 요구에 따라 다수의 출력단으로 다양하게 연결될 수 있어 수신시스템의 구성시 다수 기기로의 분배로스를 최소화하고 구성을 간략화할 수 있는 우수한 효과가 있다.As described above, the present invention includes a plurality of inputs and a plurality of outputs, and the signals of the plurality of inputs can be variously connected to a plurality of outputs according to a user's request, so that the distribution loss to a plurality of devices in the configuration of the receiving system. There is an excellent effect to minimize the configuration and simplify the configuration.
Claims (2)
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| KR100691421B1 (en) | 2004-05-29 | 2007-03-09 | 삼성전자주식회사 | Multi RF splitter and tuner apparatus for Interactive Open-Cable |
| KR20060089436A (en) * | 2005-02-04 | 2006-08-09 | 엘지전자 주식회사 | Method and apparatus for automatic gain control |
| KR101293102B1 (en) | 2006-11-09 | 2013-08-12 | 삼성전자주식회사 | Apparatus for splitting signal and video apparatus thereof |
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|---|---|---|---|---|
| JPS5923680A (en) * | 1982-07-30 | 1984-02-07 | Hitachi Ltd | Antenna switching circuit of vtr |
| JPS6422180A (en) * | 1987-07-17 | 1989-01-25 | Sony Corp | Video-integrated type television receiver corresponding to audio multiplex broadcasting |
| JPH02231887A (en) * | 1989-03-03 | 1990-09-13 | Matsushita Electric Ind Co Ltd | Terminal equipment for catv |
| JPH11164212A (en) * | 1997-11-28 | 1999-06-18 | Mitsumi Electric Co Ltd | Antenna booster circuit for vtr |
| KR20010083019A (en) * | 2000-02-21 | 2001-08-31 | 이형도 | Channel moduel apparatus for set-top box |
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- 2001-12-26 KR KR10-2001-0084599A patent/KR100406356B1/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5923680A (en) * | 1982-07-30 | 1984-02-07 | Hitachi Ltd | Antenna switching circuit of vtr |
| JPS6422180A (en) * | 1987-07-17 | 1989-01-25 | Sony Corp | Video-integrated type television receiver corresponding to audio multiplex broadcasting |
| JPH02231887A (en) * | 1989-03-03 | 1990-09-13 | Matsushita Electric Ind Co Ltd | Terminal equipment for catv |
| JPH11164212A (en) * | 1997-11-28 | 1999-06-18 | Mitsumi Electric Co Ltd | Antenna booster circuit for vtr |
| KR20010083019A (en) * | 2000-02-21 | 2001-08-31 | 이형도 | Channel moduel apparatus for set-top box |
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