KR970025138A - FM Demodulation Circuit for Satellite Broadcast Receivers with Baseband Output Polarity Change - Google Patents

FM Demodulation Circuit for Satellite Broadcast Receivers with Baseband Output Polarity Change Download PDF

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Publication number
KR970025138A
KR970025138A KR1019950034692A KR19950034692A KR970025138A KR 970025138 A KR970025138 A KR 970025138A KR 1019950034692 A KR1019950034692 A KR 1019950034692A KR 19950034692 A KR19950034692 A KR 19950034692A KR 970025138 A KR970025138 A KR 970025138A
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KR
South Korea
Prior art keywords
signal
output
polarity
baseband output
intermediate frequency
Prior art date
Application number
KR1019950034692A
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Korean (ko)
Other versions
KR0169377B1 (en
Inventor
박재호
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김광호
삼성전자 주식회사
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Application filed by 김광호, 삼성전자 주식회사 filed Critical 김광호
Priority to KR1019950034692A priority Critical patent/KR0169377B1/en
Publication of KR970025138A publication Critical patent/KR970025138A/en
Application granted granted Critical
Publication of KR0169377B1 publication Critical patent/KR0169377B1/en

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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
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
    • 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
    • H04N5/148—Video amplifiers
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G2201/00—Indexing scheme relating to subclass H03G
    • H03G2201/30—Gain control characterized by the type of controlled signal
    • H03G2201/305—Gain control characterized by the type of controlled signal being intermediate frequency signal

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

본 발명은 베이스밴드 출력 극성 변경 기능을 갖는 위성 방송 수신기용 에프엠 복조회로에 관한 것으로, 종래의 위성 방송 수신기용 에프엠 복조 회로에 포지티브/네가티브 베이스밴드 출력의 노이즈량이 서로 다를 경우 신호대 잡음(S/N)비가 높은 패스의 극성 신호를 선택하여 출력하는 극성 제어부가 추가되어 구성되었으며, 피엘엘 타입의 복조 과정을 거쳐 얻어낸 포지티브/네가티브 베이스밴드 출력의 노이즈량이 서로 다를 경우, 선택적으로 신호대 잡음(S/N)비가 높은 패스의 극성 신호를 텔레비젼 수상기에 띄울 수 있도록 함으로써 외부튜너의 응용 회로 및 피시키 패턴의 수정없이 양질의 화면을 얻을 수 있도록 한 베이스밴드 출력 극성 변경 기능을 갖는 위성 방송 수신기용 에프엠 복조회로에 관한 것이다.The present invention relates to a FM demodulation circuit for a satellite broadcast receiver having a baseband output polarity changing function. When the amount of noise of a positive / negative baseband output differs from a conventional FM broadcast demodulator for a satellite broadcast receiver, signal to noise (S / N) The polarity control unit that selects and outputs the polarity signal of the high pass ratio is added.If the amount of noise of the positive / negative baseband output obtained through the PLL type demodulation process is different, the signal-to-noise (S / N) FM signals for satellite broadcasting receivers with a baseband output polarity change function that allows a high pass ratio polarity signal to be displayed on a television receiver so that a good quality screen can be obtained without modifying an external tuner's application circuit and pattern. It is about inquiry.

Description

베이스밴드 출력 극성 변경 기능을 갖는 위성 방송 수신기용 에프엠 복조회로FM Demodulation Circuit for Satellite Broadcast Receivers with Baseband Output Polarity Change

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제2도는 본 발명의 실시예에 따른 베이스밴드 출력 극성 변경 기능을 갖는 위성 방송 수신기용 에프엠 복조 회로의 구성도이다.2 is a block diagram of an FM demodulation circuit for a satellite broadcast receiver having a baseband output polarity changing function according to an embodiment of the present invention.

Claims (3)

외부 안테나로부터 수신되는 신호의 중간 주파수(Intermediate Frequency)를 증폭시켜 증폭된 신호와 그 반전된 신호를 출력하는 중간 주파수 증폭기와; 상기 중간 주파수 증폭기로부터 출력되는 신호를 입력받아 평균 레벨을 검출하고 그 레벨을 증폭시켜 상기 중간 주파수 증폭기로 다시 피드백시킴으로써 증간 주파수 증폭기의 이득을 자동적으로 조절하여 항상 일정한 레벨의 신호가 출력되도록 하는 AGC 검출기 및 루프 증폭기와; 외부의 바랙터 다이오드, 코일 및 커패시터를 통하여 입력되는 전압에 의해서 일정한 주파수 신호를 발진하는 발진기로 구성된 전압 제어 발진부와; 상기 AGC 검출기 및 루프 증폭기를 거쳐 중간 주파수 발진기로부터 출력되는 신호와 전압 제어 발진부로부터 출력되는 신호와의 위상을 비교하여 그 차이에 해당하는 신호를 발생시키고, 그 신호를 외부의 저항, 커패시터로 이루어진 루프필터에서 필터링하여 원하는 베이스밴드 신호를 출력하는 믹서부와; 상기 믹서부로부터 출력하되는 포지티브/네가티브 베이스밴드 출력의 노이즈량이 서로 다를 경우, 신호대 잡음(S/N)비가 높은 패스의 극성 신호를 선택하여 출력하는 극성 제어부와; 상기 극성 제어부로부터 출력되는 신호를 증폭시켜 별도의 출력단을 통해 네가티브 베이스밴드 출력 신호 또는 포지티브 베이스밴드 출력 신호를 선택적으로 출력하는 비디오 증폭기를 포함하여 이루어져 있는 것을 특징으로 하는 베이스밴드 출력 극성 변경 기능을 갖는 위성 방송 수신기용 에프엠 복조 회로.An intermediate frequency amplifier for amplifying an intermediate frequency of a signal received from an external antenna and outputting an amplified signal and its inverted signal; AGC detector that receives the signal output from the intermediate frequency amplifier, detects the average level, amplifies the level and feeds it back to the intermediate frequency amplifier to automatically adjust the gain of the intermediate frequency amplifier so that a constant level signal is always output. And a loop amplifier; A voltage controlled oscillator comprising an oscillator configured to oscillate a constant frequency signal by a voltage input through an external varactor diode, a coil, and a capacitor; Compare the phase of the signal output from the intermediate frequency oscillator and the signal output from the voltage controlled oscillator via the AGC detector and the loop amplifier to generate a signal corresponding to the difference, and the signal is looped with an external resistor and capacitor A mixer for filtering the filter and outputting a desired baseband signal; A polarity control unit for selecting and outputting a polarity signal of a path having a high signal-to-noise (S / N) ratio when the amount of noise of the positive / negative baseband output output from the mixer is different; And a video amplifier for amplifying a signal output from the polarity control unit and selectively outputting a negative baseband output signal or a positive baseband output signal through a separate output terminal. FM demodulation circuit for satellite broadcasting receiver. 제1항에 있어서, 상기 극성 제어부는, 상기 믹서부의 출력단에 두 단자가 연결되어 있고 제어신호에 의해서 두 단자 중 하나의 단자가 선택되어, 선택된 단자가 상기 전압제어 발진부에 있는 두 바랙터 다이오드의 접속점에 연결되는 스위치로 이루어져 있는 것을 특징으로 하는 베이스밴드 출력 극성 변경 기능을 갖는 위성방송 수신기용 에프엠 복조회로.According to claim 1, wherein the polarity control unit, two terminals are connected to the output terminal of the mixer unit and one of the two terminals are selected by a control signal, the selected terminal of the two varactor diodes of the voltage controlled oscillation unit FM demodulation circuit for a satellite broadcasting receiver having a baseband output polarity change function, characterized in that consisting of a switch connected to the connection point. 제2항에 있어서, 상기 제어 신호는 외부 핀을 통해서 마이컴 등에 의해 미리 프로그램되어 입력될 수 있는 것을 특징으로 하는 베이스밴드 출력 극성 변경 기능을 갖는 위성 방송 수신기용 에프엠 복조회로.The FM demodulation circuit for a satellite broadcast receiver according to claim 2, wherein the control signal can be input in advance by a microcomputer or the like through an external pin.
KR1019950034692A 1995-10-10 1995-10-10 Fm demodulation circuit for a satellite broadcasting receiver having the function of converting a baseband output polarity KR0169377B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950034692A KR0169377B1 (en) 1995-10-10 1995-10-10 Fm demodulation circuit for a satellite broadcasting receiver having the function of converting a baseband output polarity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950034692A KR0169377B1 (en) 1995-10-10 1995-10-10 Fm demodulation circuit for a satellite broadcasting receiver having the function of converting a baseband output polarity

Publications (2)

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KR970025138A true KR970025138A (en) 1997-05-30
KR0169377B1 KR0169377B1 (en) 1999-03-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10273620B2 (en) 2014-03-07 2019-04-30 Samsung Electronics Co., Ltd. Washing machine and method for controlling the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10273620B2 (en) 2014-03-07 2019-04-30 Samsung Electronics Co., Ltd. Washing machine and method for controlling the same

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Publication number Publication date
KR0169377B1 (en) 1999-03-20

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