KR920008878Y1 - Signal separating circuit of pal-uhf radio frequency modulator - Google Patents

Signal separating circuit of pal-uhf radio frequency modulator Download PDF

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KR920008878Y1
KR920008878Y1 KR2019900018641U KR900018641U KR920008878Y1 KR 920008878 Y1 KR920008878 Y1 KR 920008878Y1 KR 2019900018641 U KR2019900018641 U KR 2019900018641U KR 900018641 U KR900018641 U KR 900018641U KR 920008878 Y1 KR920008878 Y1 KR 920008878Y1
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signal
stage
output
pal
circuit
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KR2019900018641U
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KR920010746U (en
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황수하
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삼성전기 주식회사
서주인
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/38Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • H04N5/40Modulation circuits

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

내용 없음.No content.

Description

PAL-UHF RF변조기의 신호분리회로Signal Separation Circuit of PAL-UHF RF Modulator

제1도는 종래의 회로 블럭도.1 is a conventional circuit block diagram.

제2도는 본 고안의 회로 블럭도.2 is a circuit block diagram of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : RF 입력단 2 : 부스터 전원입력단1: RF input terminal 2: Booster power input terminal

3 : 변조기 전원입력단 4 : 변조된 RF출력단3: Modulator power input 4: Modulated RF output

5 : RF출력단 10 : 부스터회로5: RF output stage 10: Booster circuit

11 : 증폭단 15 : 변조단11: amplification stage 15: modulation stage

20 : 릴레이20: relay

본 고안은 PAL-UHF RF변조기의 신호분리회로에 관한 것으로, 특히 RF입력신호와 RF변조기의 출력을 분리시켜 RF출력되도록 한 회로에 관한 것이다.The present invention relates to a signal separation circuit of a PAL-UHF RF modulator, and more particularly to a circuit for separating the RF input signal and the output of the RF modulator to output an RF.

이러한 변조기는 비데오신호가 기준값을 갖는 시간각격내의 반송파신호를 출력단자에서 진폭 변조된 신호가 포함하지 않는 구조로 되어져야만 한다. 이러한 결과로서, 비데오 신호는 통상적으로 예를들어 클램핑 회로의 장치에 의하여 고정된 레벨에서 얻어졌었으며, 이러한 레벨은 반송파를 포함하지 않는 출력신호에 대응한다. 이러한 기술은 NTSC 또는 PAL 표준방식에 대한 칼러부호화 회로내에서 사용된다. 이후에 칼러부판반송파의 진폭은 기준신호 간격동안 영이 되어져야만 한다.Such a modulator must have a structure in which a carrier signal within a time interval in which a video signal has a reference value does not include an amplitude modulated signal at an output terminal. As a result of this, the video signal has typically been obtained at a fixed level, for example by means of a device of a clamping circuit, which level corresponds to an output signal which does not include a carrier wave. This technique is used in color coding circuitry for NTSC or PAL standards. Thereafter, the amplitude of the color subcarrier should be zeroed for the reference signal interval.

그러나 실제에서, 반송파 신호는 이러한 간격들동안 변조기의 출력단자에서 여전히 발생한다. 즉, 예를들자면 이것은 변조기의 비대칭성, 클램핑 회로에서의 직류 오프셋 또는 공급원 전압 또는 온도에서의 순간변화에 기인한 변화분들에 기인한다. 부호화 회로에서, 출력신호의 이러한 불균형은 "부반송파누설"로서 알려져 있다. 이러한 누설을 변조신호가 변조기를 구동하여 결과적으로 결점이 대단히 작아지도록 변조기회로를 설계하므로서 대부분이 제거되어질 수 있다. 그러나, 이러한 방식은 전력을 크게 소비한다. 또 다른 가능성은 회로의 여러가지 부분들에 대한 정확한 조정이나 이러한 조정은 시간낭비이며, 이러한 결과는 시간이 흐르면 불필요한 변화가 생기는 가능성을 갖게끔 한다.In practice, however, the carrier signal still occurs at the output of the modulator during these intervals. That is, for example, this is due to variations in the asymmetry of the modulator, the DC offset in the clamping circuit or the instantaneous change in the source voltage or temperature. In the encoding circuit, this imbalance of the output signal is known as "subcarrier leakage." This leakage can be largely eliminated by designing the modulator circuit so that the modulated signal drives the modulator and consequently the defects are very small. However, this approach consumes a lot of power. Another possibility is precise adjustments to the various parts of the circuit, but these adjustments are a waste of time, and this results in the possibility of unwanted changes over time.

이러한 종래의 PAL-UHF RF 변조기의 부스터회로 구성은 제1도와 같이, RF 입력단(1)의 입력신호와 부스터 전원단(2)의 입력신호가 증폭단(11)에서 증폭되어 RF 출력단(5)을 통해 출력되었다.In the conventional booster circuit configuration of the PAL-UHF RF modulator, as shown in FIG. 1, the input signal of the RF input stage 1 and the input signal of the booster power stage 2 are amplified by the amplifying stage 11 to provide the RF output stage 5. Was output via

이때, 변조 전원단(3)에 입력된 신호에 의해 변조된 RF 출력신호(4)는 상기 증폭단(11)의 출력신호와 함께 상기 RF출력단(5)으로 출력된다.At this time, the RF output signal 4 modulated by the signal input to the modulation power supply stage 3 is output to the RF output terminal 5 together with the output signal of the amplifying stage 11.

여기에서 부스터회로는(10)으로 도시된 회로구성이다.Here, the booster circuit is a circuit configuration shown by (10).

그러나 이러한 종래의 PAL-UHF RF 변조기에서는 RF입력단(1)으로 들어오는 방송채널의 방송신호의 RF 변조기의 변조단(15) 출력(4)이 동시에 RF출력단(5)으로 출력된다.However, in the conventional PAL-UHF RF modulator, the output 4 of the modulation stage 15 of the RF modulator of the broadcast signal of the broadcast channel entering the RF input stage 1 is simultaneously output to the RF output stage 5.

따라서 RF변조기에서 출력되는 신호와 방송신호의 인접채널간 간섭현상이 발생되는 문제가 있다.Therefore, there is a problem that interference between adjacent signals of the signal and the broadcast signal output from the RF modulator occurs.

본 고안은 상기한 종래의 문제점을 해결하기 위하여 안출한 것으로, 본 고안의 목적은 변조단에서 RF변조기의 출력신호가 RF출력단으로 출력될 때 RF입력에서 들어오는 신호가 차단되어 서로간의 간섭현상을 방지하도록 한 PAL-UHF RF변조기의 신호분리회로를 제공함에 있다.The present invention has been made to solve the above-mentioned problems, the object of the present invention is to block the incoming signal from the RF input when the output signal of the RF modulator in the modulation stage is output to the RF output stage to prevent the interference between each other The present invention provides a signal separation circuit of a PAL-UHF RF modulator.

상기한 본 고안의 목적을 달성하기 위한 기술적 구성은, PAL-UHF RF변조기의 부스터단에서 증폭단과 RF출력단 사이에 스위칭회로를 구성하여 변조단 출력과 RF입력신호가 서로 간섭되는 현상을 제거한 것을 특징으로 한다.The technical configuration for achieving the object of the present invention, the switching circuit between the amplification stage and the RF output stage in the booster stage of the PAL-UHF RF modulator to remove the phenomenon that the modulation stage output and the RF input signal interfere with each other It is done.

여기에서 상기 스위칭회로는 스위칭 트랜지스터나 릴레이 회로등으로 구성된다.Here, the switching circuit is composed of a switching transistor, a relay circuit and the like.

이하 첨부된 도면에 의하여 본 고안의 바람직한 실시예를 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제2도는 본 고안의 회로 블럭구성도로서, RF입력단(1)의 입력신호와 부스터 전원입력단(2)의 전원을 받는 증폭단(11)과 RF출력단(5)사이에 스위칭 릴레이(20)를 연결하고, 변조단 전원입력단(3)의 전원을 받는 변조단(15)의 출력신호(4)를 상기 릴레이(20)에 접속하는 구성을 갖는다.2 is a circuit block diagram of the present invention, in which a switching relay 20 is connected between an amplification stage 11 and an RF output stage 5 receiving an input signal of the RF input stage 1 and a booster power input stage 2. The output signal 4 of the modulation stage 15 receiving the power of the modulation stage power input terminal 3 is connected to the relay 20.

상기와 같은 구성에서, 방송채널을 통한 방송신호를 받는 RF입력단(1)으로 RF신호가 입력되고 부스터 전원 입력단(2)으로 전원이 공급되면 증폭단(11)은 RF 방송신호를 일정레벨로 증폭시켜 릴레이(20)에 공급한다.In the configuration as described above, when the RF signal is input to the RF input terminal (1) receiving the broadcast signal through the broadcast channel and the power is supplied to the booster power input terminal (2), the amplifier stage 11 amplifies the RF broadcast signal to a predetermined level Supply to the relay 20.

한편, 변조단 전원입력단(3)으로 변조전원이 변조단(15)에 공급되면 상기 변조단(15)은 RF변조단 출력신호(4)를 상기 릴레이(20)에 공급한다.On the other hand, when modulation power is supplied to the modulation stage 15 to the modulation stage power input 3, the modulation stage 15 supplies the RF modulation stage output signal (4) to the relay (20).

여기에서 상기 변조단(15)의 RF변조된 출력신호(4)가 발생하여 상기 릴레이(20)를 통해 RF출력단(5)으로 출력될 때는, 상기 릴레이(20)에 의해서 증폭단(11)의 출력신호가 차단된다.Here, when the RF modulated output signal 4 of the modulation stage 15 is generated and outputted to the RF output terminal 5 through the relay 20, the output of the amplifying stage 11 by the relay 20 is output. The signal is cut off.

따라서 고유한 변조단(15)의 출력신호(4)만 RF출력단(5)으로 출력된다.Therefore, only the output signal 4 of the unique modulation stage 15 is output to the RF output stage 5.

한편, 상기 변조단(15)의 RF 변조된 신호(4)가 발생하지 않을 때는, 즉, 변조단 전원입력단(3)에 B+전원이 공급되지 않을 때는 상기 릴레이(20)가 상기 증폭단(11)의 출력신호를 RF출력단(5)으로 출력되도록 동작한다.On the other hand, when the RF modulated signal 4 of the modulation stage 15 does not occur, that is, when B + power is not supplied to the modulation stage power input 3, the relay 20 causes the amplifier 11 to be amplified. ) Is outputted to the RF output terminal 5.

따라서, 고유한 증폭단(11)의 출력신호만 RF출력단(5)으로 출력된다.Therefore, only the output signal of the unique amplifier stage 11 is output to the RF output stage 5.

이와 같이 동작하므로 RF 변조단의 동작시 신호와 방송신호가 완전히 분리되어 서로간의 간섭현상을 배제할 수 있는 뛰어난 효과가 있다.As such, since the signal and the broadcast signal are completely separated during the operation of the RF modulation stage, there is an excellent effect of excluding the interference phenomenon.

Claims (2)

방송신호의 RF 입력신호와 변조단의 RF 변조신호를 RF 출력하는 회로에 있어서, 상기 RF 입력신호와 부스터 입력전원을 받는 증폭단(11)과 RF 출력단(5)사이에 스위칭수단(20)을 구성하고, 상기 스위칭수단(20)에 변조단 입력전원을 받는 변조단(15)의 출력(4)을 접속하여, 상기 변조단(15)의 출력신호(4)가 있을 때 상기 증폭단(11)의 출력신호가 상기 스위칭수단(20)에 의하여 차단되도록 한 것을 특징으로 하는 PAL-UHF RF변조기의 신호분리회로.A circuit for outputting an RF input signal of a broadcast signal and an RF modulated signal of a modulation stage, comprising a switching means (20) between the amplification stage (11) and the RF output stage (5) receiving the RF input signal and the booster input power. The output means 4 of the modulation stage 15 receiving the modulation stage input power is connected to the switching means 20 so that the amplification stage 11 of the amplifying stage 11 is present when the output signal 4 of the modulation stage 15 is present. Signal separation circuit of the PAL-UHF RF modulator, characterized in that the output signal is blocked by the switching means (20). 제1항에 있어서, 상기 스위칭수단(20)는 릴레이회로로 구성한 것을 특징으로 하는 신호분리회로.2. The signal separation circuit according to claim 1, wherein the switching means (20) comprises a relay circuit.
KR2019900018641U 1990-11-30 1990-11-30 Signal separating circuit of pal-uhf radio frequency modulator KR920008878Y1 (en)

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KR2019900018641U KR920008878Y1 (en) 1990-11-30 1990-11-30 Signal separating circuit of pal-uhf radio frequency modulator

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KR920010746U KR920010746U (en) 1992-06-17
KR920008878Y1 true KR920008878Y1 (en) 1992-12-22

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