KR940010684A - High frequency reception level compensation circuit and compensation method of receiver - Google Patents

High frequency reception level compensation circuit and compensation method of receiver Download PDF

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Publication number
KR940010684A
KR940010684A KR1019920018736A KR920018736A KR940010684A KR 940010684 A KR940010684 A KR 940010684A KR 1019920018736 A KR1019920018736 A KR 1019920018736A KR 920018736 A KR920018736 A KR 920018736A KR 940010684 A KR940010684 A KR 940010684A
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KR
South Korea
Prior art keywords
signal
high frequency
tuner
output
gain
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KR1019920018736A
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Korean (ko)
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KR950011529B1 (en
Inventor
김종운
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이종수
금성알프스전자 주식회사
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Priority to KR1019920018736A priority Critical patent/KR950011529B1/en
Publication of KR940010684A publication Critical patent/KR940010684A/en
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Publication of KR950011529B1 publication Critical patent/KR950011529B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
    • 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
    • H04N5/52—Automatic gain control

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

본 발명은 안테나를 통해 튜너부로 입력되는 고주파의 수신레벨이 낮을 경우에 이를 보상하는 것으로서 종래에는 튜너부에서 출력하는 IF 신호의 레벨에 따라 중간주파 처리부가 RFAGC신호를 출력 및 튜너부로 궤환시켜 IF 신호의 레벨을 조절하는 것이므로 안테나를 통해 튜너부로 입력되는 고주파의 레벨이 이득을 조절할 수 있는 범위이하로 매우 미약할 경우에는 튜너부에서 이득이 조절되어도 IF 신호의 레벨이 낮아 감약 및 잡음이 발생하였다.The present invention compensates when the reception level of the high frequency input to the tuner through the antenna is low. Conventionally, the intermediate frequency processor returns the RFAGC signal to the output and tuner according to the level of the IF signal output from the tuner. Since the level of the high frequency inputted through the antenna to the tuner is very weak below the range where the gain can be adjusted, the level of the IF signal is low even if the gain is adjusted at the tuner, resulting in attenuation and noise.

본 발명은 안테나를 통해 수신되는 고주파의 이득을 가변 증폭하여 튜너부에 입력시키는 가변이득 중폭기를 구비하고, 중간주파 처리부에서 출력되는 RFAGC신호의 레벨을 마이콤이 판별하여 가변이득 증폭기의 증폭이득을 조절함으로써 수신되는 고주파의 전계강도가 매우 미약하여도 감약 및 잡음이 발생됨이 없이 수신할수 있다.The present invention includes a variable gain amplifier for variably amplifying the gain of a high frequency received through an antenna and inputting the tuner to a tuner. Therefore, even if the received electric field strength of the high frequency is very weak, it can be received without generating attenuation and noise.

Description

수신기의 고주파 수신레벨 보상회로 및 보상방법High frequency reception level compensation circuit and compensation method of receiver

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

제2도는 본 발명의 보상회로도,2 is a compensation circuit diagram of the present invention;

제3도는 본 발명의 보상방법을 보인 신호흐름도.3 is a signal flow diagram showing a compensation method of the present invention.

Claims (2)

안테나(ANT11)의 수신 고주파를 가변이득 증폭하는 가변이득 증폭기(11)와, 상기 가변이득 증폭기(11)의 출력신호에서 선택된 신호를 튜닝하고 RFAGC 신호에 따라 이득을 조절하여 IF 신호를 출력하는 튜너부(12)와, 상기 튜너부(12)의 출력 신호를 처리하여 수신신호를 출력함과 아울러 튜너부(12)의 출력신호 레벨에 따라 튜너부(12)로 RFAGC신호를 출력하고 AFT 신호를 출력하는 중간주파 처리부(13)와, 인에이블 신호(EN11)에 따라 인에이블되고, 상기 RFAGC신호를 디지탈로 변환 출력하는 아날로그/디지탈 변환부(14)와, 수신기의 전체동자긍 제어하고 상기 AFT 신호에 따라 미동조 조절함과 아울러 아날로그/디지탈 변환부(14)의 인에이블을 제어하여 그의 출력신호로 수신 고주파의 전계강도를 판단 및 이득조절신호(VCS)를 출력하는 마이콤(15)과 상기 마이콤(15)의 제어에 따라 인에이블되면서 이득조절신호(VCS)를 아날로그로 변환하여 가변이득증폭기(11)의 증폭이득을 조절하는 디지탈/아날로그 변환기(16)로 구성함을 특징으로 하는 수신기의 고주파 수신레벨 보상회로.A variable gain amplifier 11 for variable-gain amplifying the received high frequency of the antenna ANT11, and a tuner for tuning the signal selected from the output signal of the variable gain amplifier 11 and adjusting the gain according to the RFAGC signal to output an IF signal. The output signal of the tuner unit 12 and the tuner unit 12 outputs a received signal, and outputs an RFAGC signal to the tuner unit 12 according to the output signal level of the tuner unit 12 and generates an AFT signal. An intermediate frequency processing unit 13 to output, an analog / digital conversion unit 14 that is enabled according to the enable signal EN11, and converts and outputs the RFAGC signal to digital; The microcomputer 15 for controlling the untuning according to the signal and controlling the enable of the analog / digital converter 14 to determine the electric field strength of the received high frequency signal as its output signal and output the gain control signal VCS. Control of the microcomputer 15 And a digital / analog converter (16) for converting the gain control signal (VCS) into an analog and controlling the amplification gain of the variable gain amplifier (11). 선택된 채널의 방송신호를 튜닝하는 제1과정과, 선택된 채널 방송신호에 대한 RFAGC신호를 입력하여 고주파의 전계강도를 판단하는 제2과정과, 제2과정에서 판단한 고주파의 전계강도가 설정레벨 이하일 경우에 RFAGC 신호의 레벨에 따른 이득조절신호를 출력하여 튜너부의 입력 고주파를 증폭시키는 제3과정으로 제어됨을 특징으로 하는 수신기의 고주파 수신레벨 보상방법.A first process of tuning a broadcast signal of a selected channel, a second process of inputting an RFAGC signal for the selected channel broadcast signal, and determining the electric field strength of the high frequency; And a third process of outputting a gain control signal according to the level of the RFAGC signal to amplify the input high frequency of the tuner unit. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920018736A 1992-10-12 1992-10-12 High-level signal compensation circuit and method for tv-receiver KR950011529B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920018736A KR950011529B1 (en) 1992-10-12 1992-10-12 High-level signal compensation circuit and method for tv-receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920018736A KR950011529B1 (en) 1992-10-12 1992-10-12 High-level signal compensation circuit and method for tv-receiver

Publications (2)

Publication Number Publication Date
KR940010684A true KR940010684A (en) 1994-05-26
KR950011529B1 KR950011529B1 (en) 1995-10-05

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KR1019920018736A KR950011529B1 (en) 1992-10-12 1992-10-12 High-level signal compensation circuit and method for tv-receiver

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KR950011529B1 (en) 1995-10-05

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