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KR960036346A - Satellite broadcasting receiver - Google Patents

Satellite broadcasting receiver Download PDF

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Publication number
KR960036346A
KR960036346A KR1019950007341A KR19950007341A KR960036346A KR 960036346 A KR960036346 A KR 960036346A KR 1019950007341 A KR1019950007341 A KR 1019950007341A KR 19950007341 A KR19950007341 A KR 19950007341A KR 960036346 A KR960036346 A KR 960036346A
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South Korea
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output
signal
phase
outputting
oscillation frequency
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KR1019950007341A
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Korean (ko)
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KR0140598B1 (en
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장재선
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배순훈
대우전자 주식회사
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    • 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
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/14—Aspects of broadcast communication characterised by the type of broadcast system direct broadcast satellite [DBS]

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

본 발명은 위성방송 수신기에 관한 것으로, DBS 컨버터로부터 출력된 위성방송 신호중 추출된 채널으로 부터 검출 증폭된 중간주파수를 필터링하는 표면탄성파필터(55)와; 상기 표면탄성파필터(55)에서 출력된 중간주파수를 증폭하는 중간주파수증폭기(60); 발진주파수를 출력하는 국부발진기(65); 상기 발진주파수를 분주하여 출력하는 분주기(66); 기준주파수를 출력하는 기준발진기(67); 상기 기준주파수와 상기 분주된 발진주파수를 위상 비교하여 출력하는 위상검출기(68); 상기 위상검출기(68)에서 출력된 신호로부터 위상차를 검출하고, 상기 위상차에 따라 DC 전압을 상기 국부발진기(65)로 제공하여 국부 발진기(65)에서 출력된 발진주파수와 상기 중간주파수증폭기(62)에서 출력된 신호를 혼합하여 Q 신호를 출력하는 제2 혼합기(70); 상기 Q 신호의 베이스밴드를 선택 출력하는 제2 저역통과필터(71); 상기 국부발진기(65)에서 출력된 발진주파수의 위상을 이동시키는 위상시프터(75); 상기 위상시프터(75)에서 출력된 발진주파수와 상기 중간주파수증폭기(60)에서 출력된 신호를 혼합하여 1신호를 출력하는 제3혼합기(80) 및; 상기 I 신호의 베이스밴드를 선택 출력하는 제3저역통과필터(81)를 포함하여 구성되어, 구성이 간단할 뿐만 아니라 위상잡음을 최소화 하기 위하여 복조과정에서 위상고정루프(PLL)를 사용하여 원하는 채널의 신호를 정확히 추출할 수 있는 것이다.The present invention relates to a satellite broadcasting receiver, comprising: a surface acoustic wave filter (55) for filtering an intermediate frequency detected and amplified from a channel extracted from a satellite broadcasting signal output from a DBS converter; An intermediate frequency amplifier 60 for amplifying the intermediate frequency output from the surface acoustic wave filter 55; A local oscillator 65 for outputting an oscillation frequency; A divider 66 for dividing and outputting the oscillation frequency; A reference oscillator 67 for outputting a reference frequency; A phase detector 68 for outputting a phase comparison between the reference frequency and the divided oscillation frequency; The phase difference is detected from the signal output from the phase detector 68, and a DC voltage is supplied to the local oscillator 65 according to the phase difference to output the oscillation frequency output from the local oscillator 65 and the intermediate frequency amplifier 62. A second mixer 70 for mixing the signals output from the second output unit to output a Q signal; A second low pass filter (71) for selectively outputting the baseband of the Q signal; A phase shifter 75 for shifting the phase of the oscillation frequency output from the local oscillator 65; A third mixer (80) for mixing the oscillation frequency output from the phase shifter (75) and the signal output from the intermediate frequency amplifier (60) and outputting one signal; And a third low pass filter 81 for selectively outputting the baseband of the I signal, which is simple in configuration and uses a phase locked loop (PLL) during demodulation to minimize phase noise. The signal of can be extracted accurately.

Description

위성방송 수신기Satellite broadcasting receiver

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

Claims (1)

DBS 컨버터로부터 출력된 위성방송 신호중 원하는 채널을 추출한 다음 상기 채널으로 부터 중간주파수를 검출 증폭한 후 QPSK 복조하여 I, Q 신호를 출력하는 위성방송 수신기에 있어서, 상기 증폭된 중간주파수를 필터링하는 표면탄성파필터(55)와; 상기 표면탄성파필터(55)에서 출력된 중간주파수를 증폭하는 중간주파수증폭기(60); 발진주파수를 출력하는 국부발진기(65); 상기 발진주파수를 분주하여 출력하는 분주기(66); 기준주파수를 출력하는 기준발진기(67); 상기 기준주파수와 상기 분주된 발진주파수를 위상 비교하여 출력하는 위상검출기(68); 상기 위상검출기(68)에서 출력된 신호로부터 위상차는 검출하고, 상기 위상차에 따라 DC 전압을 상기 국부발진기(65)로 제공하여 국부발진기(65)의 발진주파수 및 위상을 제어하는 제1저역통과필터(69); 상기 국부발진기(65)에서 출력된 발진주파수와 상기 중간주파수증폭기(60)에서 출력된 신호를 혼합하여 Q신호를 출력하는 제2혼합기(70); 상기 Q 신호의 베이스밴드를 선택 출력하는 제2저역통과필터(71); 상기 국부발진기(65)에서 출력된 발진주파수의 위상을 이동시키는 위상시프터(75); 상기 위상시프터(75)에서 출력된 발진주파수와 상기 중간주파수증폭기(60)에서 출력된 신호를 혼합하여 I 신호를 출력하는 제3혼합기(80) 및 ; 상기 I 신호의 베이스밴드를 선택 출력하는 제3 저역통과필터(81)를 포함하여 구성된 것을 특징으로 하는 위성방송 수신기.A satellite broadcasting receiver which extracts a desired channel from a satellite broadcasting signal output from a DBS converter, detects and amplifies an intermediate frequency from the channel, and then outputs I and Q signals by QPSK demodulation, the surface acoustic wave filtering the amplified intermediate frequency. A filter 55; An intermediate frequency amplifier 60 for amplifying the intermediate frequency output from the surface acoustic wave filter 55; A local oscillator 65 for outputting an oscillation frequency; A divider 66 for dividing and outputting the oscillation frequency; A reference oscillator 67 for outputting a reference frequency; A phase detector 68 for outputting a phase comparison between the reference frequency and the divided oscillation frequency; A first low pass filter for detecting a phase difference from the signal output from the phase detector 68 and providing a DC voltage to the local oscillator 65 according to the phase difference to control the oscillation frequency and phase of the local oscillator 65. 69; A second mixer (70) for mixing the oscillation frequency output from the local oscillator (65) and the signal output from the intermediate frequency amplifier (60) to output a Q signal; A second low pass filter (71) for selectively outputting the baseband of the Q signal; A phase shifter 75 for shifting the phase of the oscillation frequency output from the local oscillator 65; A third mixer (80) for mixing the oscillation frequency output from the phase shifter (75) and the signal output from the intermediate frequency amplifier (60) to output an I signal; And a third low pass filter (81) for selectively outputting the baseband of the I signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950007341A 1995-03-31 1995-03-31 Satellite broadcasting receiver Expired - Fee Related KR0140598B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950007341A KR0140598B1 (en) 1995-03-31 1995-03-31 Satellite broadcasting receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950007341A KR0140598B1 (en) 1995-03-31 1995-03-31 Satellite broadcasting receiver

Publications (2)

Publication Number Publication Date
KR960036346A true KR960036346A (en) 1996-10-28
KR0140598B1 KR0140598B1 (en) 1998-07-01

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KR1019950007341A Expired - Fee Related KR0140598B1 (en) 1995-03-31 1995-03-31 Satellite broadcasting receiver

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104459360B (en) * 2014-12-18 2017-05-24 南京航空航天大学 Microwave source phase noise test method and device based on microwave photon mixing technology

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