KR910003729B1 - Sound and volume control system of catv converter - Google Patents

Sound and volume control system of catv converter Download PDF

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Publication number
KR910003729B1
KR910003729B1 KR1019880007674A KR880007674A KR910003729B1 KR 910003729 B1 KR910003729 B1 KR 910003729B1 KR 1019880007674 A KR1019880007674 A KR 1019880007674A KR 880007674 A KR880007674 A KR 880007674A KR 910003729 B1 KR910003729 B1 KR 910003729B1
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South Korea
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signal
volume control
modulator
stereo
unit
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KR1019880007674A
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Korean (ko)
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KR900001257A (en
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안종국
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삼성전기 주식회사
서주인
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • 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
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals

Abstract

A voice stereo and volume control system for a CATV converter comprises an IF amplifier (1) for amplifying an IF signal from a tuner, a quasi-parallel type SAW filter section (2) serially connected to the IF amplifier and dividing the IF signal into the image and voice signals, an image detector (3), a voice detector (4) having a volume controller (6) and a tank section (6) to compensate the signal linearity, and a RF demodulator (7) including a PLL and a FM modulator (8). The system is capable of receiving the stereo broadcasting and controlling the volume.

Description

유선 TV 컨버터에서 음성스테레오와 볼륨제어시스템Voice Stereo and Volume Control System in Cable TV Converter

첨부된 도면은 본 발명의 회로계통도이다.The accompanying drawings are circuit diagrams of the present invention.

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

1 : IF 증폭부 2 : 쏘우필터부1: IF amplifier 2: Saw filter unit

3 : 영상검파부 4 : 음성검파부3: Image detector 4: Voice detector

5 : 탱크부 6 : 볼륨제어부5: tank part 6: volume control part

7 : RF 변조기 8 : PLL 및 FM 변조부7: RF modulator 8: PLL and FM modulator

본 발명은 유선 TV 방송의 수신용 컨버터와 관련된 것으로서, 이는 특히 유선 TV 방송국에서 음성신호에 대한 스테레오방송이 행해질 때 그 컨버터에 의해 스테레오방송의 청취가 가능토록되는 음성스테레오와 볼륨제어시스템에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a converter for receiving wired TV broadcasts, and more particularly, to a voice stereo and a volume control system that enables the stereo broadcaster to listen to stereo broadcasts when a stereo broadcast is performed on a voice signal in a cable TV station. .

일반적인 유선 TV의 스테레오방송이 행해질 때는 이의 수신용 컨버터에서 볼륨제어를 위해 IF 신호를 베이스밴드신호로 변환하고 이를 다시 RF로 변조하는 과정을 거치기 때문에 상기 RF 변조과정에서 음성의 스테레오신호가 통과하지 못하게 되고 이로인한 음성의 스테레오 청취를 하지 못하게 된다는 문제점이 있었다.When stereo broadcasting of general cable TV is performed, the receiving converter converts the IF signal into a baseband signal and modulates it back to RF for volume control so that the stereo signal of the voice cannot pass through the RF modulation process. There was a problem that can not be heard stereo due to this.

일예로, 근자에의 유선 TV 컨버터는 원격조절(Remote Control)시스템이 도입되어지면서 상기 원격조절시스템으로의 볼륨제어를 위한 컨버터측의 수단이 마련되어 있지 않아 이 볼륨제어기능을 구비한 컨버터가 성행되고 있다.For example, in recent years, as a cable TV converter has been introduced to a remote control system, a converter having a volume control function has been prevalent because there is no means on the converter side for volume control to the remote control system. have.

그러나, 상기 예의 경우에는 스테레오신호가 상기와 같은 IF 신호 등의 변환조건으로 완전왜곡되거나 감쇄가 되는 원인이 되었던 것이었다.However, in the above example, the stereo signal was caused to be completely distorted or attenuated by the conversion conditions such as the IF signal as described above.

본 발명은 종래의 상기와 같은 문제점을 개선하고져 발명한 것으로서, 이는 특히 음성 및 영상신호를 쏘우필터단에서 상호분리시키고 음성처리부에서 볼륨제어를 행하는 방법으로 유선 TV 방송국측에서의 음성 스테레오방송의 스테레오 청취가 가능하며 그 볼륨제어도 이룰 수 있도록 한 것이다.The present invention has been invented to solve the above problems, and in particular, it is possible to separate audio and video signals at the Saw filter stage and to control the volume at the audio processing unit. It is possible to achieve the volume control.

이하에서 이를 좀더 상세히 설명하면 다음과 같다.This will be described in more detail below.

즉, 도면에는 본 발명에 의한 컨버터측의 음성스테레오 및 볼륨제어시스템을 나타내고 있다.That is, the figure shows the audio stereo and volume control system on the converter side according to the present invention.

여기서는 투너측에서 IF 신호가 입력되면 이는 IF 증폭부(1)를 거쳐 쏘우필터부(2)로 연결되어진다.In this case, when the IF signal is input from the toner side, it is connected to the saw filter unit 2 through the IF amplifier unit 1.

상기 쏘우필터부(2)는 영상신호가 음성신호에 전혀 영향을 주지않도록 쿼지-패러렐(Quasi-Parallel)형태의 쏘우필터로 구성되어진다.The saw filter unit 2 is constituted by a saw filter of a quasi-parallel type so that the video signal does not affect the audio signal at all.

쏘우필터부(2)로 걸러진 영상신호와 음성신호는 각기 영상검파부(3) 및 음성검파부(4)로 가해지고, 음성검파부(4)에선 특정신호탱크부(5)와 볼륨제어부(6)가 마련되어 있다.The video signal and the audio signal filtered by the saw filter unit 2 are applied to the video detector 3 and the voice detector 4, respectively, and in the voice detector 4, the specific signal tank 5 and the volume control unit ( 6) is provided.

상기 영상검파부(3) 및 음성검파부(4)는 각기 RF 변조기(7)의 영상입력단과 음성입력단으로 각기 가해지며 상기 RF 변조기(7)는 PLL 및 FM 변조부(8)가 상호 연결된 구성으로 된다.The image detector 3 and the voice detector 4 are respectively applied to an image input terminal and an audio input terminal of the RF modulator 7, and the RF modulator 7 has a PLL and an FM modulator 8 connected to each other. Becomes

이러한 구성의 본 발명은 튜너측에서 IF 신호가 입력되면 쏘우필터부(2)측에서의 신호손실 및 그 후단의 신호감쇄조건을 고려하여 IF 증폭부(1)에서 그 IF 신호를 충분히 증폭한다.In the present invention having such a configuration, when the IF signal is input from the tuner side, the IF amplifier 1 fully amplifies the IF signal in consideration of the signal loss at the saw filter unit 2 and the signal attenuation condition at the subsequent stage.

이후 상기 증폭된 IF 신호는 쏘우필터부(2)측으로 가해지며, 이 쏘우필터부(2)는 상기 IF 신호중 영상신호와 음성신호를 제각기 분리할 수 있는 쿼지-패러렐 형태로 되어 영상신호가 음성신호에 영향을 주지 않으면서 음성검파부(4) 및 영상검파부(3)측으로 분리입력되어진다.Thereafter, the amplified IF signal is applied to the Saw filter unit 2, and the Saw filter unit 2 is in a quasi-parallel form capable of separating the video signal and the audio signal from the IF signals, respectively, so that the video signal is an audio signal. The inputs are separately input to the voice detector 4 and the image detector 3 without affecting.

음성검파부(4)에선 스테레오신호가 ±78KHz 까지 점유되고 있기 때문에 탱크부(5)에서 신호의 직선상을 3dB점, 대역폭을 ±110KHz이상으로 충분히 유지시켜준다.Since the stereo signal is occupied by ± 78 KHz in the voice detector 4, the tank part 5 sufficiently maintains the signal in the straight line at 3 dB point and the bandwidth is more than ± 110 KHz.

이후 영상과 음성이 각기 복조된 다음 순수음성 및 영상신호가 되고 음성검파부(4)측의 볼륨제어부(6)에선 직류전압조절에 따른 음성조절을 적당량 행하게 된다.Thereafter, the video and audio are demodulated, respectively, and become pure audio and video signals, and the volume control unit 6 on the audio detector unit 4 performs an appropriate amount of audio control according to the DC voltage control.

상기 영상 및 음성검파부(3,4)를 거친 순수음성 및 영상신호는 변조기(7)측으로 가해지고 RF 변조기(7)에선 이들 신호가 RF 신호로 변환되어진다.The pure audio and video signals which have passed through the video and audio detectors 3 and 4 are applied to the modulator 7 side, and the RF modulator 7 converts these signals into RF signals.

여기서 상기 RF 변조시는 모노타입은 최대 25KHz 정도만 RF 변조하면 되는 것이나 스테레오는 78KHz정도까지 확장되어야 하므로 RF 변조기(7)측에 FM 변조부(8)로 상기 스테레오 범위까지 주파수를 확장변조하고, 4.5KHz FM 캐리어의 정확도에 따라 잡음이 발생될 소지가 있으므로 PLL부(8)에 의해 4.5MHz±5KHz 이내로 제어하게 된다.In the RF modulation, the mono type needs only RF modulation up to about 25KHz, but the stereo should be extended up to about 78KHz, and the FM modulator 8 on the RF modulator 7 side modulates the frequency up to the stereo range, 4.5. Since noise may be generated depending on the accuracy of the KHz FM carrier, the PLL unit 8 controls the noise within 4.5 MHz ± 5 KHz.

이러한 본 발명은 유선 TV의 컨버터가 유선스테레오 방식으로 방송되어질 경우 그 스테레오방송 청취가 가능케되면서 그 리모콘에 의한 볼륨제어기능도 행할 수 있는 유익한 특징이 있는 것이다.The present invention has an advantageous feature that when the converter of the cable TV is broadcast in a wired stereo manner, the stereo broadcast can be listened to and the volume control function can be performed by the remote controller.

Claims (1)

튜너측에서의 IF 단과 RF 변조기(7)등을 포함한 컨버터에 어서, 상기 IF 단엔 IF 증폭기(1)및 쿼지 패러렐 쏘우필터부(2)가 직결되어지고, 이 쏘우필터부(2)의 출력은 영상검파부(3)와, 신호직선성 보상용 탱크부(5) 및 볼륨제어부(6)가 구비된 음성검파부(4)측으로 각기 분리되어 연결되며, 상기 영상검파부(3) 및 음성검파부(4) 출력이 PLL 및 FM 변조부(8)를 가진 RF 변조기(7)측으로 각기 연결되는 구성을 특징으로 하는 유선TV 컨버터에서 음성 스테레오와 볼륨제어시스템.In the converter including the IF stage and the RF modulator 7 on the tuner side, the IF stage 1 and the quaternary parallel saw filter unit 2 are directly connected to the IF stage, and the output of the saw filter unit 2 is detected. The unit 3 is separately connected to the voice detection unit 4 provided with the signal linearity compensation tank unit 5 and the volume control unit 6, and the image detection unit 3 and the voice detection unit ( 4) An audio stereo and volume control system in a cable TV converter, characterized in that the outputs are respectively connected to the RF modulator 7 side with the PLL and FM modulator 8.
KR1019880007674A 1988-06-24 1988-06-24 Sound and volume control system of catv converter KR910003729B1 (en)

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KR910003729B1 true KR910003729B1 (en) 1991-06-08

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