KR0158595B1 - Digital satellite broadcast tuner - Google Patents
Digital satellite broadcast tuner Download PDFInfo
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- KR0158595B1 KR0158595B1 KR1019950050745A KR19950050745A KR0158595B1 KR 0158595 B1 KR0158595 B1 KR 0158595B1 KR 1019950050745 A KR1019950050745 A KR 1019950050745A KR 19950050745 A KR19950050745 A KR 19950050745A KR 0158595 B1 KR0158595 B1 KR 0158595B1
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- Prior art keywords
- signal
- amplifier
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- digital
- unit
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Classifications
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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
- H04N5/50—Tuning indicators; Automatic tuning control
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
- H03J3/08—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
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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
- H04N5/4446—IF amplifier circuits specially adapted for B&W TV
Abstract
본 발명은 안테나로부터 고주파신호를 입력받아 베이스밴드의 오디오신호와 비디오신호를 출력하는 디지탈 위성방송튜너에 관한 것으로, 선택된 채널신호를 입력받아 중간주파신호로 변환하는 아날로그부와, 상기 아날로그부로부터 출력되는 중간주파신호를 복조하고, 디지탈신호로 변환하며, 디코딩 및 디스크램블하는 디지탈부를 일체로 구성하므로써, 회로설계가 간단하고, 생산적 측면 및 EMI측면에서 효율적인 효과가 있다.The present invention relates to a digital satellite broadcasting tuner that receives a high frequency signal from an antenna and outputs an audio signal and a video signal of a baseband. The present invention relates to an analog unit for receiving a selected channel signal and converting the signal into an intermediate frequency signal. By demodulating the intermediate frequency signal, converting the digital signal into a digital signal, and decoding and descramble the integrated digital part, the circuit design is simple and the productive side and the EMI side are effective.
Description
제1도는 종래 위성방송튜너의 구성을 보여주는 블럭도.1 is a block diagram showing the configuration of a conventional satellite broadcast tuner.
제2도는 본 발명에 의한 위성방송튜너의 구성을 보여주는 블럭도이다.2 is a block diagram showing the configuration of a satellite broadcast tuner according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
21 : 전치증폭부 22 : 가변대역통과필터21: preamplifier 22: variable band pass filter
23 : 증폭부 24 : 주파수변환부23: amplifier 24: frequency converter
25 : 위상동기루프(PLL) 26 : IF증폭부25: PLL 26: IF amplifier
27 : 쏘필터 28 : 후지증폭부27: Saw filter 28: Fuji amplifier
29 : 자동이득제어부 30 : I/Q복조부29: automatic gain control unit 30: I / Q demodulation unit
31 : 아날로그/디지탈컨버터 32 : 디코딩부31: analog / digital converter 32: decoding unit
33 : 디스크램블러 34 : 출력부33: descrambler 34: output unit
본 발명은 위성방송(BS:Satellite Broadcasting)튜너에 관한 것으로, 특히 아날로그신호처리부 뿐만 아니라 디지탈신호처리부를 일체화하여 베이스밴드의 오디오신호와 비디오신호를 출력하는 디지탈 위성방송 튜너에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcasting (BS) tuner, and more particularly, to a digital satellite broadcast tuner that outputs an audio signal and a video signal of a baseband by integrating not only an analog signal processor but also a digital signal processor.
일반적으로, 위성방송의 수신은 적도상공의 정지위성으로부터 전송되는 SHF대(Super High Frequency, 대략 10GHz대)의 초고주파신호를 각 가정에 구비된 파라볼라안테나로 집속하고, 상기 파라볼라안테나에 구비된 저잡음 주파수변환기(LNB:Low Noise Block downconverter)에서 UHF대(UHF:Ultra High Frequency, 약 1GHz)의 고주파신호로 변환하여 위성방송튜너로 입력됨으로써 이루어진다.In general, the reception of satellite broadcasting focuses an ultra-high frequency signal of the SHF band (super high frequency, approximately 10 GHz band) transmitted from a stationary satellite over the equator to a parabola antenna provided in each home, and a low noise frequency provided in the parabola antenna. A low noise block downconverter (LNB) converts a high frequency signal of a UHF band (UHF: Ultra High Frequency, about 1 GHz) into a satellite broadcasting tuner.
제1도는 종래의 위성방송튜너의 구성을 보여주는 블럭도로써, 안테나로 수신된 신호를 소정의 레벨로 증폭하는 저잡음증폭기(11)와, 상기 저잡음증폭기(11)로부터 입력된 방송신호대역을 통과시키는 가변대역통과필터(12)와, 상기 가변대역통과필터(12)를 통과한 방송신호를 소정의 레벨로 증폭하는 증폭기(13)와, 위상동기루프(PLL)(17)로부터 입력되는 전압에 의한 발진주파수를 출력하는 발진기(16)와, 상기 발진기(16)로부터 출력되는 신호를 증폭하는 증폭기(15)와, 상기 두 증폭기(13), (15)로부터 입력되는 고주파방송신호와 발진신호를 혼합하는 믹서(14)아, 상기 믹서(14)로부터 출력되는 IF신호를 증폭하는 IF증폭기(18)와, 상기 IF증폭기(18)로부터 입력되는 IF신호를 통과시키는 쏘필터(19)와, 상기 쏘필터(19)를 통과한 중간주파신호를 증폭하는 증폭기(20)와, 상기 증폭기(20)로부터 출력되는 IF신호의 전압레벨을 검출하여 상술한 저잡음증폭기(11) 및 IF증폭기(18)의 증폭레벨을 조정하는 자동이득조절부(21)을 구비한다.FIG. 1 is a block diagram showing the configuration of a conventional satellite broadcast tuner. The low noise amplifier 11 amplifies a signal received by an antenna to a predetermined level, and passes the broadcast signal band input from the low noise amplifier 11. A variable band pass filter 12, an amplifier 13 for amplifying a broadcast signal passing through the variable band pass filter 12 to a predetermined level, and a voltage input from a phase locked loop (PLL) 17. An oscillator 16 for outputting an oscillation frequency, an amplifier 15 for amplifying a signal output from the oscillator 16, a high frequency broadcast signal and an oscillation signal input from the two amplifiers 13 and 15 are mixed. A mixer 14, an IF amplifier 18 for amplifying an IF signal output from the mixer 14, a saw filter 19 for passing an IF signal input from the IF amplifier 18, and the saw An amplifier 20 for amplifying the intermediate frequency signal passing through the filter 19, Provided with an automatic gain control unit (21) for adjusting the amplification levels of the above-described low noise amplifier 11 and the IF amplifier 18 detects the voltage level of the IF signal output from the amplifier group 20.
그런데, 종래에는 튜너가 아날로그신호만을 처리하고, 상기 튜너로부터 출력되는 중간주파신호를 QPSK복조하는 복조부와, 상기 복조부로부터 출력되는 디지탈신호에서 에러를 수정하는 전진에러수정부를 분리하여 설계 및 생산을 하므로써, 설계가 복잡하고 생산적인 측면에서 비효율적인 문제점이 있었다.However, in the related art, the tuner processes only an analog signal, and separates a demodulation unit for QPSK demodulation of an intermediate frequency signal output from the tuner, and a forward error correction unit for correcting errors in the digital signal output from the demodulator. As a result, the design was complicated and productive inefficient.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 그 목적은 위성방송수신기의 아날로그신호처리부와 디지탈신호처리부를 일체화하여 최종적으로 베이스밴드의 비디오신호와 오디오신호를 출력하는 디지탈 위성방송튜너를 제공함에 있다.The present invention is to solve the above problems, an object of the present invention is to integrate a digital signal processing unit and an analog signal processing unit of the satellite broadcast receiver to provide a digital satellite broadcasting tuner that finally outputs the baseband video signal and audio signal. have.
상기와 같은 목적을 달성하기 위한 기술적인 수단으로써, 본 발명은 디지탈 위성방송튜너에 있어서, 안테나로부터 입력되는 신호를 증폭하는 전치증폭부와, 설정된 채널에 따라서 통과대역이 가변하여 상기 전치증폭부로부터 출력되는 방송 신호를 통과시키는 가변대역통과필터와, 상기 가변대역통과필터로부터 입력되는 고주파신호를 중간주파신호로 변환하는 주파수변환부와, 상기 주파수변환부로부터 입력되는 중간주파대역신호를 증폭하는 IF증폭부와, 상기 IF증폭부로부터 출력신호중 IF대역을 선택하는 쏘필터부와, 상기 쏘필터부로부터 출력된 IF신호를 증폭하는 후치증폭부와, 상기 후치증폭부로부터 출력되는 IF신호의 전압레벨을 검출하여 상술한 전치증폭부와, IF증폭부의 증폭도를 조절하는 자동이득제어부와, 상기 후치증폭부로부터 출력되는 IF신호를 복조하여 I신호와 Q신호로 분리하는 I/Q복조부와, 상기 I/Q복조부로부터 입력되는 신호를 디지탈신호로 변환하는 아날로그/디지탈컨버터와, 상기 아날로그/디지탈컨버터로부터 입력되는 디지탈신호에서 전송도중 삽입된 에러를 검출하고 수정하는 디코딩부와, 상기 디코딩부로부터 입력되는 디지탈신호를 복원하는 디스크램블러와, 상기 디스크램블러와 출력단사이에 구비되는 정합회로인 출력부를 구비함을 특징으로 한다.As a technical means for achieving the above object, the present invention is a digital satellite broadcasting tuner, a preamplifier for amplifying a signal input from the antenna, and the passband is variable according to the set channel from the preamplifier A variable bandpass filter for passing the output broadcast signal, a frequency converter for converting a high frequency signal input from the variable bandpass filter into an intermediate frequency signal, and an IF for amplifying the intermediate frequency band signal input from the frequency converter; An amplifier, a saw filter section for selecting an IF band among the output signals from the IF amplifier section, a post amplifier section for amplifying the IF signal output from the saw filter section, and a voltage level of the IF signal output from the post amplifier section; Detection from the preamplifier, the automatic gain control unit for adjusting the amplification degree of the IF amplification unit, and output from the post amplification unit. An I / Q demodulator for demodulating the IF signal to be separated into an I signal and a Q signal, an analog / digital converter for converting a signal input from the I / Q demodulator into a digital signal, and an input from the analog / digital converter And a decoding unit for detecting and correcting an error inserted during transmission of the digital signal, a descrambler for restoring the digital signal input from the decoding unit, and an output unit which is a matching circuit provided between the descrambler and the output terminal. It features.
이하 첨부한 도면을 참조하여 설명한다.It will be described below with reference to the accompanying drawings.
제2도는 본 발명에 의한 디지탈위성방송튜너의 구성을 보여주는 블럭도로써, 안테나로부터 입력되는 고주파방송신호를 증폭하는 전치증폭부(21)와, 통과대역이 수신채널에 따라 가변하여 상기 전치증폭부(21)로부터 출력되는 신호중 수신채널신호만을 통과시키는 가변대역통과필터(22)와, 상기 가변대역통과필터(22)를 통과한 방송신호를 증폭하는 증폭부(23)와, 위상동기루프(25)로부터 입력되는 전압에 의한 발진주파수를 출력하는 발진기(24C)와 증폭기 및 믹서를 구비하여 상기 증폭부(23)로부터 입력되는 신호를 일정주파수대역의 중간주파신호로 변환하는 주파수변환부(24)와, 상기 주파수변환부(24)로부터 출력되는 중간주파신호를 소정레벨로 증폭하는 IF증폭부(26)와, 상기 IF증폭부(26)로부터 출력되는 신호중 IF대역신호만 통과시키는 쏘필터(27)와, 상기 쏘필터(27)를 통과한 IF신호를 증폭하는 후치증폭부(28)와, 상기 후치증폭부(28)로부터 출력되는 신호의 전압레벨을 검출하여 상기 전치증폭부(21)와 IF증폭부(26)의 증폭도를 조절하는 자동이득조절(AGC)부(29)와, 상기 후치증폭부(28)로부터 입력되는 방송신호를 QPSK복조하고 I신호 및 Q신호로 분리하는 I/Q복조부(30)와, 상기 I/Q복조부(30)로부터 입력되는 I신호 및 Q신호를 디지탈신호로 변환하는 아날로그/디지탈컨버터(31)와, 비터비(Viterbi)디코더(32A)와, 리드-솔로몬(Reed-Solomon)디코더(32B)로 이루어져 전송도중 발생된 에러를 검출하여 수정하는 디코딩부(32)와, 상기 디코딩부(32)로부터 출력되는 디코딩된 디지탈신호를 디스크램블하는 디스크램블러(33)와, 상기 디스크램블러(33)와 출력단사이에 구비되는 정합회로인 출력부(34)를 구비한다.2 is a block diagram showing the configuration of a digital satellite broadcast tuner according to the present invention. The preamplifier 21 amplifies a high frequency broadcast signal input from an antenna, and the preamplifier is a variable pass band according to a reception channel. A variable bandpass filter 22 for passing only a reception channel signal among the signals output from the signal 21, an amplifier 23 for amplifying a broadcast signal passed through the variable bandpass filter 22, and a phase locked loop 25 A frequency converter 24 having an oscillator 24C for outputting an oscillation frequency according to a voltage input from the amplifier, an amplifier, and a mixer and converting a signal input from the amplifier 23 into an intermediate frequency signal of a predetermined frequency band. And an IF amplifier 26 for amplifying the intermediate frequency signal output from the frequency converter 24 to a predetermined level, and a saw filter 27 for passing only the IF band signal among the signals output from the IF amplifier 26. ) And A post amplifier 28 which amplifies the IF signal passing through the filter 27 and a voltage level of the signal output from the post amplifier 28 are detected to detect the preamplifier 21 and the IF amplifier. Automatic gain control (AGC) unit 29 for adjusting the amplification degree of (26) and I / Q demodulation unit for QPSK demodulation and separating the I / Q signal to the broadcast signal input from the post-amplification amplifier (28) ( 30), an analog / digital converter 31 for converting I and Q signals input from the I / Q demodulator 30 into digital signals, a Viterbi decoder 32A, and a Reed-Solomon (Reed-Solomon) A decoder 32B comprising a decoder 32B for detecting and correcting an error generated during transmission, and a descrambler 33 for descrambled a decoded digital signal output from the decoder 32. And an output unit 34 which is a matching circuit provided between the descrambler 33 and the output terminal.
상기 구성에 의한 본 발명의 작용 및 효과를 상세하게 설명한다.The operation and effects of the present invention by the above configuration will be described in detail.
제2도에서, 안테나로부터 입력되는 고주파신호는 먼저 전치증폭부(21)에 의하여 증폭되고, 대역통과필터(22)를 통과하면서 대역외신호는 감쇄되고, 다시 증폭부(23)에서 증폭되어 주파수변환부(24)내의 믹서(24A)로 입력된다. 주파수변환부(24)내부의 발진기(24C)는 제어부(도시생략)의 제어에 의하여 동작하는 위상동기루프(25)로부터 입력되는 전압에 따른 발진주파수를 출력하고, 상기 발진기(24C)로부터 출력된 발진주파수는 증폭기(24B)에서 증폭된 후 믹서(24A)로 입력된다. 상기 믹서(24A)는 입력되는 두 신호(고주파방송신호와 발진주파수)를 혼합하여 중간주파신호를 출력하고, 이 중간주파신호는 IF증폭부(26)에서 증폭된다. 쏘필터(27)은 상기 IF증폭부(26)로부터 출력되는 중간주파신호를 선택 통과시키고, 상기 쏘필터(27)로부터 출력되는 중간주파신호는 후치증폭부(28)에서 증폭되어 출력된다. 그리고 자동이득제어부(29)는 상기 후치증폭부(28)로부터 출력되는 신호의 전압레벨을 검출하여 상술한 전치증폭부(21)와 IF증폭부(26)의 증폭도를 조절한다. 이에 의하여 후치증폭부(28)로부터 출력되는 중간주파신호의 전압레벨이 일정하게 유지된다. 이상이 아날로그신호처리로부로써, 기존의 위성방송튜너와 같은 부분이다.In FIG. 2, the high frequency signal input from the antenna is first amplified by the preamplifier 21, and the out-of-band signal is attenuated while passing through the band pass filter 22, and then amplified by the amplifying unit 23 to be a frequency. It is input to the mixer 24A in the converter 24. The oscillator 24C inside the frequency converter 24 outputs an oscillation frequency corresponding to the voltage input from the phase synchronization loop 25 operated by the control of a controller (not shown), and is output from the oscillator 24C. The oscillation frequency is amplified by the amplifier 24B and then input to the mixer 24A. The mixer 24A mixes two input signals (high frequency broadcast signal and oscillation frequency) to output an intermediate frequency signal, which is amplified by the IF amplifier 26. The saw filter 27 selectively passes the intermediate frequency signal output from the IF amplifier 26, and the intermediate frequency signal output from the saw filter 27 is amplified by the post amplifier 28 and output. The automatic gain controller 29 detects the voltage level of the signal output from the post amplifier 28 and adjusts the amplification degree of the preamplifier 21 and the IF amplifier 26 described above. As a result, the voltage level of the intermediate frequency signal output from the post amplifier 28 is kept constant. The above is an analog signal processing part, which is the same part as a conventional satellite broadcast tuner.
그리고, 상기 후치증폭부(28)로부터 출력되는 중간주파신호는 I/Q복조부(30)에서 I(In-phase)신호와 Q(Quadrature)신호로 분리된다. 아날로그/디지탈컨버터부(31)는 상기 I/Q복조부(30)로부터 출력되는 I신호와 Q신호를 디지탈신호로 변환하고, 디코딩부(32)는 상기 아날로그/디지탈컨버터부(31)로부터 출력되는 디지탈신호를 해독하여 전송도중 발생된 에러를 검출 및 수정한다. 이 디코딩부(32)는 viterbi디코더(32A)와 reed-solomon디코더(32B)를 구비하고, 2단계로 에러수정을 행함에 의하여 신호의 에러검출 및 수정효율을 높혔다. 상기 디코딩부(32)로부터 출력되는 에러가 수정된 디지탈신호는 디스크램블러(33)에서 복원되어 출력부(34)를 통하여 출력된다. 이상의 부분이 디지탈신호처리부로써 상기 출력부(34)로 출력되는 신호는 최종 베이스밴드신호인 오디오신호와 비디오신호이다.The intermediate frequency signal output from the post amplifier 28 is separated into an I (Q) signal and a Q (Quadrature) signal by the I / Q demodulator 30. The analog / digital converter unit 31 converts the I and Q signals output from the I / Q demodulator 30 into digital signals, and the decoder 32 outputs from the analog / digital converter unit 31. Decoded digital signals are detected to detect and correct errors generated during transmission. The decoding unit 32 includes a viterbi decoder 32A and a reed-solomon decoder 32B, and improves error detection and correction efficiency of the signal by performing error correction in two steps. The digital signal in which the error output from the decoding unit 32 is corrected is recovered by the descrambler 33 and output through the output unit 34. The above signal is a digital signal processor, and the output signal to the output unit 34 is an audio signal and a video signal which are final baseband signals.
이와 같이, 본 발명은 기존의 아날로그신호처리장치만 구비되었던 튜너에 I/Q복조부, 아날로그/디지탈 컨버터, 디코딩부등의 디지탈신호처리부를 일체로 구비함으로써, 회로설계가 간단하고, EMI측면 및 생산측면에서 효율적인 우수한 효과가 있는 것이다.As described above, the present invention has a simple circuit design, EMI side and production by integrating a digital signal processing unit such as an I / Q demodulation unit, an analog / digital converter, and a decoding unit in a tuner provided with only an existing analog signal processing unit. In terms of efficiency, there is an excellent effect.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019950050745A KR0158595B1 (en) | 1995-12-15 | 1995-12-15 | Digital satellite broadcast tuner |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019950050745A KR0158595B1 (en) | 1995-12-15 | 1995-12-15 | Digital satellite broadcast tuner |
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| KR970055332A KR970055332A (en) | 1997-07-31 |
| KR0158595B1 true KR0158595B1 (en) | 1999-03-20 |
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| KR1019950050745A KR0158595B1 (en) | 1995-12-15 | 1995-12-15 | Digital satellite broadcast tuner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100380723B1 (en) * | 2001-05-25 | 2003-04-18 | 삼성전기주식회사 | Digital satellite receiver with capability of improving receiving sensitivity in low field area |
| KR100895795B1 (en) * | 2007-11-23 | 2009-05-07 | 광운대학교 산학협력단 | Multicast both-way radio communications system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100539507B1 (en) * | 1998-09-25 | 2006-02-28 | 엘지전자 주식회사 | apparatus for selecting instance of audio/video control tuner in bus system |
| KR100353861B1 (en) * | 1999-11-11 | 2002-09-26 | 한국전자통신연구원 | DTV Tuner Apparatus And Method For Broadband Auto Frequency Channel Selection Using Approximated Frequency Mapping Function |
-
1995
- 1995-12-15 KR KR1019950050745A patent/KR0158595B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100380723B1 (en) * | 2001-05-25 | 2003-04-18 | 삼성전기주식회사 | Digital satellite receiver with capability of improving receiving sensitivity in low field area |
| KR100895795B1 (en) * | 2007-11-23 | 2009-05-07 | 광운대학교 산학협력단 | Multicast both-way radio communications system |
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| Publication number | Publication date |
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| KR970055332A (en) | 1997-07-31 |
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