KR960039977A - Satellite Broadcasting Demodulator - Google Patents

Satellite Broadcasting Demodulator Download PDF

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Publication number
KR960039977A
KR960039977A KR1019950010429A KR19950010429A KR960039977A KR 960039977 A KR960039977 A KR 960039977A KR 1019950010429 A KR1019950010429 A KR 1019950010429A KR 19950010429 A KR19950010429 A KR 19950010429A KR 960039977 A KR960039977 A KR 960039977A
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KR
South Korea
Prior art keywords
phase
output
controlled oscillator
oscillation frequency
outputting
Prior art date
Application number
KR1019950010429A
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Korean (ko)
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KR0179566B1 (en
Inventor
장재선
Original Assignee
배순훈
대우전자 주식회사
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Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019950010429A priority Critical patent/KR0179566B1/en
Publication of KR960039977A publication Critical patent/KR960039977A/en
Application granted granted Critical
Publication of KR0179566B1 publication Critical patent/KR0179566B1/en

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Classifications

    • 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
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • H04H20/74—Wireless systems of satellite networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation

Abstract

본 발명은 위성방송용 복조기에 관한 것으로, 발진 주파수를 출력하는 전압제어발진기(1)와; 상기 전압제어발진기(1)에서 출력된 발진 주파수와 튜너(도시하지 않음)에서 출력된 신호(r(t))의 위상차를 출력하는 제1위상검출기(2); 상기 제1위상검출기(2)에서 출력된 신호를 필터링하여 I신호를 출력하는 제1저역통과필터(3); 상기 전압제어발진기(1)에서 출력된 발진 주파수의 위상을 90도 이동시키는 위상시프터(4); 상기 위상시프터(4)에서 출력된 발진 주파수와 튜너(도시하지 않음)에서 출력된 신호의 위상차를 출력하는 제2위상검출기(5); 상기 제2위상검출기(5)에서 출력된 신호를 필터링하여 Q신호를 출력하는 제2저역통과필터(6) 및; 상기 전압제어발진기(1)에서 출력되는 발진 주파수의 위상을 이중으로 고정시키는 위상제어부(10)를 포함하여 구성되어, 전압제어발진기(1)의 위상을 이중으로 고정시켜줌으로써 위상 잡음 및 안정도를 극대화할 수 있는 것이다.The present invention relates to a demodulator for satellite broadcasting, comprising: a voltage controlled oscillator (1) for outputting an oscillation frequency; A first phase detector (2) for outputting a phase difference between an oscillation frequency output from the voltage controlled oscillator (1) and a signal (r (t)) output from a tuner (not shown); A first low pass filter (3) for filtering the signal output from the first phase detector (2) to output an I signal; A phase shifter (4) for shifting the phase of the oscillation frequency output from the voltage controlled oscillator (1) by 90 degrees; A second phase detector (5) for outputting a phase difference between an oscillation frequency output from the phase shifter (4) and a signal output from a tuner (not shown); A second low pass filter 6 for filtering the signal output from the second phase detector 5 and outputting a Q signal; It comprises a phase control unit 10 for fixing the phase of the oscillation frequency output from the voltage-controlled oscillator (1) in a double, to maximize the phase noise and stability by fixing the phase of the voltage-controlled oscillator (1) double You can do it.

Description

위성방송용 복조기Satellite Broadcasting Demodulator

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

제2도는 본 발명에 따른 위성방송용 복조기의 블럭선도이다.2 is a block diagram of a demodulator for satellite broadcasting according to the present invention.

Claims (2)

발진 주파수를 출력하는 전압제어발진기(1)와; 상기 전압제어발진기(1)에서 출력된 발진 주파수와 튜너(도시하지 않음)에서 출력된 신호(r(t))의 위상차를 출력하는 제1위상검출기(2); 상기 제1위상검출기(2)에서 출력된 신호를 필터링하여 I신호를 출력하는 제1저역통과필터(3); 상기 전압제어발진기(1)에서 출력된 발진 주파수의 위상을 90도 이동시키는 위상시프터(4); 상기 위상시프터(4)에서 출력된 발진 주파수와 튜너(도시하지 않음)에서 출력된 신호의 위상차를 출력하는 제2위상검출기(5); 상기 제2위상검출기(5)에서 출력된 신호를 필터링하여 Q신호를 출력하는 제2저역통과필터(6) 및; 상기 전압제어발진기(1)에서 출력되는 발진 주파수의 위상을 이중으로 고정시키는 위상제어부(10)를 포함하여 구성된 위성방송용 복조기.A voltage controlled oscillator 1 for outputting an oscillation frequency; A first phase detector (2) for outputting a phase difference between an oscillation frequency output from the voltage controlled oscillator (1) and a signal (r (t)) output from a tuner (not shown); A first low pass filter (3) for filtering the signal output from the first phase detector (2) to output an I signal; A phase shifter (4) for shifting the phase of the oscillation frequency output from the voltage controlled oscillator (1) by 90 degrees; A second phase detector (5) for outputting a phase difference between an oscillation frequency output from the phase shifter (4) and a signal output from a tuner (not shown); A second low pass filter 6 for filtering the signal output from the second phase detector 5 and outputting a Q signal; And a phase control unit (10) for fixing the phase of the oscillation frequency output from the voltage controlled oscillator (1) to a double. 제1항에 있어서, 상기 위상제어부(10)는, 상기 제1저역통과필터(3)와 제2저역통과필터(6)에서 각각 출력된 I 신호와 Q신호의 위상차를 출력하는 제3위상검출기(12)와; 상기 제3위상검출기(12)에서 출력된 위상차를 검출하고, 검출된 위상차에 따라 DC 전압을 상기 전압제어발진기(1)로 입력하여 전압제어발진기(1)의 발진 주파수 및 위상을 안정시키는 루프필터(14); 상기 전압제어발진기(1)에서 출력된 발진 주파수를 분주하여 출력하는 분주기(16); 기준주파수를 출력하는 기준주파수발진기(18); 상기 분주기(16)에서 출력된 주파수와 상기 기준주파수발진기(18)에서 출력된 기준주파수를 위상차를 출력하는 제4위상검출기(20) 및; 상기 제4위상검출기(20)에서 출력된 위상차를 검출하고, 검출된 위상차에 따라 DC 전압을 상기 전압제어발진기(1)로 입력하여 전압제어발진기(1)의 발진 주파수 및 위상을 안정시키는 제3저역통과필터(22)를 포함하여 구성된 것을 특징으로 하는 위성방송용 복조기.The third phase detector of claim 1, wherein the phase controller 10 outputs a phase difference between the I signal and the Q signal output from the first low pass filter 3 and the second low pass filter 6, respectively. 12; A loop filter which detects a phase difference output from the third phase detector 12 and stabilizes the oscillation frequency and phase of the voltage controlled oscillator 1 by inputting a DC voltage to the voltage controlled oscillator 1 according to the detected phase difference. (14); A divider 16 for dividing and outputting the oscillation frequency output from the voltage controlled oscillator 1; A reference frequency oscillator 18 for outputting a reference frequency; A fourth phase detector (20) for outputting a phase difference between the frequency output from the frequency divider (16) and the reference frequency output from the reference frequency oscillator (18); A third phase for detecting a phase difference output from the fourth phase detector 20 and inputting a DC voltage to the voltage controlled oscillator 1 according to the detected phase difference to stabilize the oscillation frequency and phase of the voltage controlled oscillator 1 Demodulator for satellite broadcasting, comprising a low pass filter (22). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950010429A 1995-04-29 1995-04-29 Demodulator for a satellite broadcasting KR0179566B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950010429A KR0179566B1 (en) 1995-04-29 1995-04-29 Demodulator for a satellite broadcasting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950010429A KR0179566B1 (en) 1995-04-29 1995-04-29 Demodulator for a satellite broadcasting

Publications (2)

Publication Number Publication Date
KR960039977A true KR960039977A (en) 1996-11-25
KR0179566B1 KR0179566B1 (en) 1999-05-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150045124A (en) * 2013-10-18 2015-04-28 현대모비스 주식회사 Apparatus and Method for optimizing phase noise

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150045124A (en) * 2013-10-18 2015-04-28 현대모비스 주식회사 Apparatus and Method for optimizing phase noise

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Publication number Publication date
KR0179566B1 (en) 1999-05-01

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