KR970019021A - Tuner for satellite broadcasting with quadrature-phase (I-Q) demodulator - Google Patents

Tuner for satellite broadcasting with quadrature-phase (I-Q) demodulator Download PDF

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Publication number
KR970019021A
KR970019021A KR1019950031531A KR19950031531A KR970019021A KR 970019021 A KR970019021 A KR 970019021A KR 1019950031531 A KR1019950031531 A KR 1019950031531A KR 19950031531 A KR19950031531 A KR 19950031531A KR 970019021 A KR970019021 A KR 970019021A
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KR
South Korea
Prior art keywords
demodulation
signal
tuner
control means
output
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KR1019950031531A
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Korean (ko)
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KR0153082B1 (en
Inventor
우제동
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김회수
엘지전자부품 주식회사
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Priority to KR1019950031531A priority Critical patent/KR0153082B1/en
Publication of KR970019021A publication Critical patent/KR970019021A/en
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Publication of KR0153082B1 publication Critical patent/KR0153082B1/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
    • 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
    • H04N5/4446—IF amplifier circuits specially adapted for B&W TV
    • 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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Superheterodyne Receivers (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

본 발명은 디지털 변조신호를 복조하기 위한 직교위상 복조기의 일부를 이용하여 아날로그 복조회로를 구성함으로써, 변조방식이 다른 디지털 신호와 아날로그 신호를 수신 및 복조할 수 있도록 한 I-Q 복조기를 내장한 위성방송 수신용 튜너에 관한 것인바, 그 특징은 프로그램 가능한 분주비로 국부발진기의 발진주파수를 가변시켜 입력 신호로부터 IF 출력을 만들어내는 튜너의 IF 출력수단과, 주제어수단의 제어명령에 따라 상기 I-Q복조수단의 스위치 절환동작을 제어하는 I-Q복조 제어수단과, 외부의 키입력이 가능하게 하는 키입력수단과, 복조할 각 채널의 중심주파수에 해당하는 데이터값을 미리 결정하여 상기 키입력수단의 키선택신호로 튜너의 프로그램 가능 분주수단의 분주비를 제어함과 동시에 상기 I-Q복조 제어수단으로 스위치를 제어신호를 내보내는 주제어수단과, 상기 I-Q복조 제어수단에 의해 제어되는 스위치로 상기 튜너의 IF 출력 수단에 연결되는 아날로그 복조회로와 디지털 복조회로를 선택적으로 구성하여 그 스위치의 절환동작에 따라 아날로그 복조신호와 디지털 복조신호를 선택적으로 출력하는 I-Q복조수단으로 구성함에 있다.The present invention constructs an analog demodulation circuit using a portion of a quadrature demodulator for demodulating a digitally modulated signal, thereby allowing satellite broadcasting with an IQ demodulator to receive and demodulate digital and analog signals having different modulation schemes. The tuner for receiving is characterized in that the IF output means of the tuner produces an IF output from an input signal by varying the oscillation frequency of the local oscillator at a programmable division ratio and the control command of the main control means. IQ demodulation control means for controlling the switch switching operation, key input means for enabling external key input, and data values corresponding to the center frequency of each channel to be demodulated in advance as key selection signals of the key input means. Controlling the switch by the IQ demodulation control means while controlling the dispense ratio of the programmable dispensing means of the And an analog demodulation circuit and a digital demodulation circuit selectively connected to the IF output means of the tuner by a main control means for outputting the signal and the switch controlled by the IQ demodulation control means, and the analog demodulation signal according to the switching operation of the switch. And IQ demodulation means for selectively outputting a digital demodulation signal.

Description

직교위상(I-Q) 복조기를 내장한 위성방송 수신용 튜너Tuner for satellite broadcasting with quadrature-phase (I-Q) demodulator

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

제4도는 본 발명에 의한 I-Q 복조기를 내장한 튜너의 일 실시예를 보인 블럭도.4 is a block diagram showing an embodiment of a tuner incorporating an I-Q demodulator according to the present invention.

Claims (3)

프로그램 가능한 분주비로 국부발진기의 발진주파수를 가변시켜 입력신호로부터 IF 출력을 만들어내는 튜너의 IF 출력수단과, 주제어수단의 제어명령에 따라 상기 I-Q복조수단의 스위치 절환동작을 제어하는 I-Q복조 제어수단과, 외부의 키입력이 가능하게 하는 키입력수단과, 복조할 각 채널의 중심주파수에 해당하는 데이터값을 미리 결정하여 상기 키입력수단의 키선택신호로 튜너의 프로그램가능 분주수단의 분주비를 제어함과 동시에 상기 I-Q복조 제어수단으로 스위치를 제어신호를 내보내는 주제어수단과, 상기 I-Q복조 제어수단에 의해 제어되는 스위치로 상기 튜너의 IF 출력수단에 연결되는 아날로그 복조회로와 디지털 복조회로를 선택적으로 구성하여 그 스위치의 절환동작에 따라 아날로그 복조신호와 디지털 복조신호를 선택적으로 출력하는 I-Q복조수단으로 구성함을 특징으로 하는 I-Q 복조부를 내장한 위성방송 수신용 튜너.IF output means of the tuner which generates the IF output from the input signal by varying the oscillation frequency of the local oscillator with a programmable division ratio, and IQ demodulation control means for controlling the switch switching operation of the IQ demodulation means according to the control command of the main control means; And pre-determining a data value corresponding to the center frequency of each channel to be demodulated, and controlling the division ratio of the programmable dispensing means of the tuner with a key selection signal of the key input means. And a main control means for sending a control signal to the IQ demodulation control means, and an analog demodulation circuit and a digital demodulation circuit connected to the IF output means of the tuner with a switch controlled by the IQ demodulation control means. The analog demodulation signal and the digital demodulation signal can be selectively output according to the switching operation of the switch. Tuner for receiving a satellite broadcast with an I-Q demodulation unit, characterized in that the I-Q demodulation means. 제1항에 있어서, 상기 튜너의 IF 출력수단은 외부에서의 채널선택을 위한 제어신호에 의해 분주비를 가변하여 국부발진기의 발진주파수를 가변시키는 프로그램 가능 분주기(13A)와, 상기 분주의 채널선택을 위한 제어신호와 1차 미세조정신호에 의해 제어되는 1차 국부발진기(12A)를 포함하는 것을 특징으로 하는 I-Q 복주부를 내장한 위성방송 수신용 튜너.The frequency divider (13A) according to claim 1, wherein the IF output means of the tuner includes a programmable divider (13A) for varying the oscillation frequency of the local oscillator by varying the division ratio by a control signal for channel selection from the outside. A tuner for satellite broadcasting reception, comprising an IQ demodulator, comprising a primary local oscillator 12A controlled by a control signal for selection and a primary fine adjustment signal. 제1항에 있어서, 상기 I-Q복주수단은 상기 IF 출력단자에서 공통으로 입력되는 두 개의 혼합기(81)(82)와, 상기 두 혼합기에 2차 국부발진주파수를 공급하기 위한 2차 국부발진기(87)와, 상기 두 혼합기에 위상차이(90도)를 두기 위한 이상기(85)와, 상기 두 혼합기의 출력단에 각각 연결되어 디지털 복조의 직교위상 출력신호를 만들어내는 저역통과필터(83)(84)와, 아날로그 변조된 신호에 맞는 대역폭을 갖도록 설계하여 상기 하나의 저역통과필터(83)의 출력단자로 연결한 루프필터(86)와, 상기 I-Q복조 제어수단의 제어신호에 따라 상기 루프필터나 디지털 복조기로부터의 2차 자동미세조정신호를 선택적으로 2차 국부발진기에 연결하기 위한 스위치(88)로 구성함을 특징으로 하는 I-Q 복조부를 내장한 위성방송 수신용 튜너.The method of claim 1, wherein the IQ recovery means includes two mixers 81 and 82 which are commonly input at the IF output terminal, and a secondary local oscillator 87 for supplying a secondary local oscillation frequency to the two mixers. ), An ideal phaser 85 for putting a phase difference (90 degrees) in the two mixers, and a low pass filter (83) (84) connected to the output terminals of the two mixers, respectively, to generate a quadrature output signal of digital demodulation. And a loop filter 86 designed to have a bandwidth suitable for an analog modulated signal and connected to an output terminal of the one low pass filter 83, and according to the control signal of the IQ demodulation control means. And a switch (88) for selectively connecting the second automatic fine adjustment signal from the demodulator to the secondary local oscillator. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950031531A 1995-09-23 1995-09-23 Tuner for satellite broadcasting receiver having i-q demodulator KR0153082B1 (en)

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Application Number Priority Date Filing Date Title
KR1019950031531A KR0153082B1 (en) 1995-09-23 1995-09-23 Tuner for satellite broadcasting receiver having i-q demodulator

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Application Number Priority Date Filing Date Title
KR1019950031531A KR0153082B1 (en) 1995-09-23 1995-09-23 Tuner for satellite broadcasting receiver having i-q demodulator

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KR970019021A true KR970019021A (en) 1997-04-30
KR0153082B1 KR0153082B1 (en) 1998-12-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100715126B1 (en) * 1999-06-29 2007-05-10 소니 인터내셔널(유로파) 게엠베하 Broadcast receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100715126B1 (en) * 1999-06-29 2007-05-10 소니 인터내셔널(유로파) 게엠베하 Broadcast receiver

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