KR950006754A - Automatic high frequency (RF) modulator channel switching device and its switching method - Google Patents

Automatic high frequency (RF) modulator channel switching device and its switching method Download PDF

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Publication number
KR950006754A
KR950006754A KR1019930017034A KR930017034A KR950006754A KR 950006754 A KR950006754 A KR 950006754A KR 1019930017034 A KR1019930017034 A KR 1019930017034A KR 930017034 A KR930017034 A KR 930017034A KR 950006754 A KR950006754 A KR 950006754A
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KR
South Korea
Prior art keywords
modulator
video signal
channel
signal
switching
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KR1019930017034A
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Korean (ko)
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KR950010916B1 (en
Inventor
류우태
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배순훈
대우전자 주식회사
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Priority to KR1019930017034A priority Critical patent/KR950010916B1/en
Publication of KR950006754A publication Critical patent/KR950006754A/en
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Publication of KR950010916B1 publication Critical patent/KR950010916B1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00Arrangements for synchronising receiver with transmitter
    • H04L7/02Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/027Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00Arrangements for synchronising receiver with transmitter
    • H04L7/02Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/44Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50Tuning indicators; Automatic tuning control

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

본 발명은 TV/VCR의 RF 모듈레이터 출력 채널을 자동으로 절환하기 위한 장치 및 방법에 관한 것으로, RF 입력단(RFin)이 안테나와 연결되고 RF 출력단(RFout)은 TV에 연결된 모듈레이터와, 상기 모듈레이터(10) 내에 장착되어 채널 절환 작동을 하는 절환 스위치와, 동기 신호 유무를 판별하여 상기 절환 스위치의 스위칭을 컨트롤 하는 마이컴과, 상기 모듈레이터와 마이컴에 연결되어 마이컴의 채널 선택 데이타에 따라 적합한 채널을 튜닝하는 PLL 튜너부(50)와, 상기 PLL 튜너부(50)의 연결되어 튜닝된 주파수를 증폭하는 중간 주파 증폭부(60)와, 상기 중간 주파수 증폭부에 연결되어 중간 주파 증폭된 영상 신호 및 음성 신호를 처리하는 영상 신호 처리부 및 음성 신호처리부와, 상기 영상 신호 처리부의 동기 신호를 검출하여 그 유무를 상기 마이컴에 전달하는 동기 검출부로 구성되어 VCR의 영상·음성신호 출력에 사용되는 3채널, 또는 4채널중의 한 채널이 방송되고 있는 경우, 방송되고 있는 영상신호에서 동기 신호를 검출하여 제어 수단(40)에 의해 제어함으로써 방송이 없는 채널로 자동으로 절환되도록 한 것이다.The present invention relates to an apparatus and method for automatically switching an RF modulator output channel of a TV / VCR, wherein an RF input terminal (RFin) is connected to an antenna and an RF output terminal (RFout) is connected to a TV, and the modulator 10 ) A switching switch for channel switching operation, a microcomputer controlling the switching of the switching switch by determining the presence of a synchronization signal, and a PLL connected to the modulator and the microcomputer to tune a suitable channel according to the channel selection data of the microcomputer. A tuner unit 50, an intermediate frequency amplifier 60 for amplifying the tuned frequency of the PLL tuner unit 50, and an intermediate frequency amplified video signal and an audio signal connected to the intermediate frequency amplifier unit. A video signal processing unit and an audio signal processing unit for processing and detecting the synchronization signal of the video signal processing unit and transmitting the presence or absence thereof to the microcomputer; If one of three channels or four channels used for outputting the video and audio signals of the VCR is broadcast, the detection unit detects a synchronous signal from the broadcast video signal and controls it by the control means 40. By doing so, it automatically switches to the channel without broadcasting.

Description

브이씨알의 고주파(RF) 모듈레이터 채널 자동 절환장치 및 그의 절환방법Automatic high frequency (RF) modulator channel switching device and its switching method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 VCR의 RF 모듈레이터 자동 채널 절환 블럭도,2 is an RF modulator automatic channel switching block diagram of a VCR according to the present invention;

제3도는 제2도에 따른 채널절환 과정의 흐름도.3 is a flowchart of a channel switching process according to FIG. 2;

Claims (2)

RF입력단(RFin)은 안테나에 연결되고 RF출력단(RFout)은 TV에 연결된 RF모듈레이터(10)와, 상기 RF모듈레이터내에 장착되어 채널 절환 작동을 하는 절환 스위치와, 상기 모듈레이터의 영상 입력단(Vin)에 영상신호를 제공하는 영상신호 처리부(20)와 상기 모듈레이터의 음성입력단(Ain)에 음성 신호를 제공하는 음성 신호 처리부(25)로 구성된 채널 절환장치에 있어서, 상기 영상신호 처리부(20)의 동기신호를 검출하는 동기 검출기(30)와; 상기 동기 검출기(30)의 동기신호 유무를 판별하여 상기 절환 스위치(15)를 제어하는 마이컴(40)과; 상기 마이컴으로부터 제어신호를 입력받아 상기 모듈레이터(10)에서 선택된 채널에 적합하도록 튜닝하는 PLL튜너부(50)와; 상기 PLL튜너부로부터 튜닝된 신호를 입력받아 증폭하는 중간 주파 증폭부(60)를 더욱 포함하는 것을 특징으로 하는 VCR의 RF모듈레이터 채널자동 절환장치.The RF input terminal RFin is connected to an antenna and the RF output terminal RFout is connected to an RF modulator 10 connected to a TV, a switching switch mounted in the RF modulator for channel switching operation, and an image input terminal Vin of the modulator. A channel switching device comprising a video signal processor (20) for providing a video signal and an audio signal processor (25) for providing a voice signal to an audio input terminal (Ain) of the modulator, wherein the synchronization signal of the video signal processor (20) is provided. A synchronous detector 30 for detecting a; A microcomputer 40 for determining whether a synchronization signal of the synchronization detector 30 is present and controlling the switching switch 15; A PLL tuner unit 50 which receives a control signal from the microcomputer and tunes to a channel selected by the modulator 10; And an intermediate frequency amplifying unit (60) for receiving and amplifying the tuned signal from the PLL tuner unit. RF입력단(RFin)은 안테나에 연결되고 RF출력단(RFout)은 TV에 연결된 RF모듈레이터와, 상기 RF모듈레이터내에 장착되어 채널 절환 작동을 하는 절환 스위치와, 상기 모듈레이터의 영상 입력단(Vin)에 영상신호를 제공하는 영상신호 처리부와 상기 모듈레이터의 음성입력단(Ain)에 음성 신호를 제공하는 음성 신호 처리부(25)로 구성된 채널 절환장치의 채널 절환방법에 있어서, 상기 영상신호에서 동기신호 검출단(30)으로 동기신호를 검출하는 단계와; 상기 검출단계에서의 동기신호 검출결과에 상응하여 설정된 채널을 선택할 수 있도록 상기 절환 스위치를 절환시키는 단계로 이루어진 VCR의 RF모듈레이터 채널자동 절환방법.An RF input terminal (RFin) is connected to the antenna and the RF output terminal (RFout) is connected to the TV, an RF modulator, a switching switch mounted in the RF modulator for channel switching operation, and a video signal to the image input terminal (Vin) of the modulator. In the channel switching method of the channel switching device comprising a video signal processing unit for providing a voice signal to the audio input terminal (Ain) of the modulator, the channel switching method comprising: from the video signal to the synchronization signal detection stage (30) Detecting a synchronization signal; And switching the switching switch so as to select a channel set according to the detection result of the synchronization signal in the detecting step. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930017034A 1993-08-30 1993-08-30 Radio frequency modulator channel auto-on, off device and method thereof in video cassette recorder KR950010916B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930017034A KR950010916B1 (en) 1993-08-30 1993-08-30 Radio frequency modulator channel auto-on, off device and method thereof in video cassette recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930017034A KR950010916B1 (en) 1993-08-30 1993-08-30 Radio frequency modulator channel auto-on, off device and method thereof in video cassette recorder

Publications (2)

Publication Number Publication Date
KR950006754A true KR950006754A (en) 1995-03-21
KR950010916B1 KR950010916B1 (en) 1995-09-25

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KR1019930017034A KR950010916B1 (en) 1993-08-30 1993-08-30 Radio frequency modulator channel auto-on, off device and method thereof in video cassette recorder

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KR950010916B1 (en) 1995-09-25

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