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KR970055331A - Frequency automatic fine tuning device and method of digital satellite broadcasting receiver - Google Patents

Frequency automatic fine tuning device and method of digital satellite broadcasting receiver Download PDF

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KR970055331A
KR970055331A KR1019950047898A KR19950047898A KR970055331A KR 970055331 A KR970055331 A KR 970055331A KR 1019950047898 A KR1019950047898 A KR 1019950047898A KR 19950047898 A KR19950047898 A KR 19950047898A KR 970055331 A KR970055331 A KR 970055331A
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receiving
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value
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KR0162437B1 (en
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정권술
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구자홍
엘지전자주식회사
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Circuits Of Receivers In General (AREA)
  • Superheterodyne Receivers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

본 발명은 디지탈 위성방송 수신기에 관한 것으로, 종래에는 위성 안테나 및 저잡음 블록다운 증폭기의 열잡음등의 원인으로 인하여 IF주파수가 틀어진 경우가 발셍하여 보정신호에 의하여 IF주파수의 변화를 추종하더라도 필터의 이득 특성이 불균형하게 되어 복조된 I와 Q신호의 왜곡이 생기는 문제점과, 이의 문제점을 해결하기 위하여 소우필터를 광대역으로 쓰게되면 신호의 왜곡은 감소되지만 인접간섭이나 잡음등의 침투가 커지게 되어 이또한 전송되는 디지탈 신호의 에러가 발생하는 비트가 많아져서 신호가 열화되는 문제점이 발생한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital satellite broadcasting receiver. In the related art, the IF frequency is distorted due to the thermal noise of a satellite antenna and a low-noise block-down amplifier. This imbalance causes distortion of demodulated I and Q signals, and to solve the problem, when the Saw filter is used over a wide band, the distortion of the signal is reduced, but the penetration of adjacent interference or noise increases, which also causes transmission. There is a problem that the signal is degraded due to a large number of bits in which an error of a digital signal is generated.

따라서, 본 발명에서는 이러한 문제점을 감안하여 소우필터를 굳이 광대역으로 사용하지 않고, IF 신호가 특정 기준값보다 크다면 BS튜너의 RF측 국부발진 주파수가 작아지도록 제어하고, 반면에 IF 신호가 특정 기준값보다 작다면 BS튜터의 RF측 국부발진 주파수가 커지도록 제어하여 원하는 값에서 이를 고정시킴으로써 항상 일정한 IF주파수가 되도록 하며, IF 주파수가 빠르다고 판단되면 BS튜터의 RF측 국부발진 주파수가 느리게 되도록 제어하고, 반면에 IF주파수가 느리다고 판단되면 BS튜너의 RF측 국부발진 주파수가 빨라지도록 제어하여 원하는 빠르기에서 이를 고정시킴으로써 항상 일정한 IF주파수가 되도록 함으로써 종래의 문제점을 해결하게 되는 것이다.Therefore, in the present invention, in view of such a problem, the saw filter is not necessarily used as a wide bandwidth, and if the IF signal is larger than a specific reference value, the RF local oscillation frequency of the BS tuner is controlled to be smaller, whereas the IF signal is smaller than the specific reference value. If it is small, the RF side oscillation frequency of the BS tutor is controlled to be large so as to be fixed at a desired value so that it is always a constant IF frequency.If the IF frequency is determined to be fast, the RF side oscillation frequency of the BS tutor is controlled to be slow. If the IF frequency is determined to be slow, the RF local oscillation frequency of the BS tuner is controlled to be fast and fixed at a desired speed so that the constant IF frequency is solved the conventional problem.

Description

디지탈 위성방송 수신기의 주파수 자동 미세 조정장치 및 방법Frequency automatic fine tuning device and method of digital satellite broadcasting receiver

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

제4도는 본 발명 주파수 자동 미세 조정장치가 적용된 디지탈 위성방송 수신기를 나타낸 내부 블럭도.4 is an internal block diagram showing a digital satellite broadcasting receiver to which the present invention is automatically adjusted.

Claims (4)

마이크로 컴퓨터의 피엘엘 데이타를 입력받아 RF 신호를 중간주파수 신호로 변환하는 BS튜너와, 상기 BS튜너로부터 출력되는 중간주파수신호를 I와 Q신호로 분리한 다음 전압제어발진부의 출력과 믹싱하여 그에따른와신호를 출력하는 신호 분리부와, 상기 신호 분리부의 출력을 디지탈 신호로 변환하는 아날로그/디지탈 변환부와, 상기 아날로그/디지탈 변환부의 출력을 입력받아 I와 Q신호를 복조하여 출력하는 매칭 필터부와, 상기 매칭 필터부에서 출력되는 I와 Q신호의 위상에러를 검출하는 위상에러 검출부와, 상기 위상에러 검출부의 출력과 보정신호 발생부의 출력을 입력받아 이를 합산하여 일정직류전압으로 변환하는 루프필터와, 상기 루프필터의 출력을 입력받아 그에따라 전압제어 발진하여 출력하는 상기 전압제어발진부와, 상기 전압제어발진부의 출력을 입력받아 N분주하는 분주부와, 상기 분주부의 출력 및 리세트부의 리세트신호를 입력받아 기준구간마다 주파수 카운팅하는 카운터와, 기준구간마다 리세트신호를 발생하는 상기 리세트부와, 상기 카운터 및 상기 리세트부의 출력을 입력받아 그 카운터값의 크기를 판별하는 비교부와, 상기 비교부의 판별신호를 입력받아 그에따른 보정신호를 발생하는 상기 보정신호 발생부와, 시스템을 총괄제어하는 상기 마이크로 컴퓨터로 구성된 디지탈 위성방송 수신기에 있어서, 상기 카운터의 출력 및 리세트부의 출력을 입력받아 마이크로 컴퓨터에서 출력되는 중심주파수 데이타값을 기준으로 상기 카운터의 주파수 카운팅 값이 큰가 작은가를 판별하여 그에대한 판별값을 상기 마이크로 컴퓨터로 출력하는 감산기를 더 포함하여 구성한 것을 특징으로 하는 디지탈 위성방송 수신기의 주파수 자동 미세 조정장치.BS tuner for receiving RF data of microcomputer and converting RF signal into intermediate frequency signal, and separating intermediate frequency signal outputted from BS tuner into I and Q signals and mixing with output of voltage controlled oscillator. Wow A signal separation unit for outputting a signal, an analog / digital conversion unit for converting the output of the signal separation unit into a digital signal, a matching filter unit for receiving the output of the analog / digital conversion unit and demodulating and outputting I and Q signals; A phase error detection unit for detecting a phase error of the I and Q signals output from the matching filter unit, a loop filter which receives the output of the phase error detection unit and the output of the correction signal generator, adds them, and converts them into a constant DC voltage; The voltage controlled oscillator for receiving the output of the loop filter and outputting the voltage controlled oscillation according to the output of the loop filter; A counter for receiving a signal and frequency counting for each reference section, the reset unit for generating a reset signal for each reference section, and the car And a comparator for receiving the output of the control unit and the reset unit and determining the magnitude of the counter value, the compensating signal generator for receiving the discrimination signal of the comparator and generating a correction signal according to the comparator; In the digital satellite broadcasting receiver composed of a microcomputer, it is determined whether the frequency counting value of the counter is large or small based on the center frequency data value outputted from the microcomputer by receiving the output of the counter and the reset unit. And a subtractor for outputting the value to the microcomputer. 감산부의 판별값을 리드하여 그 값이 0이라고 판단되면 피엘엘 데이타를 현재의 값으로 고정하여 출력하는 제 1 과정과, 상기 제 1 과정에 의하여 0이 아니라고 판단되면 그 값이 양수인지를 판별하는 제 2 과정과, 상기 제 2 과정에 의하여 감산부의 판별값이 양수라고 판단되면 피엘엘 데이타를 한 스텝 감소시킨 다음 감산부의 판별값을 다시 입력받는 제 3 과정과, 제 3 과정의 판단결과 0 또는 음수라고 판단되면 피엘엘 데이타를 현재의 값으로 고정시키고 양수이면 상기 제 3 과정으로 복귀하는 제 4 과정과, 상기 제 2 과정에 의한 판단결과 판별값이 음수라고 판단되면 피엘엘 데이타를 한 스텝 증가시킨 다음 감산부의 판별값을 다시 입력받는 제 5 과정과, 제 5 과정의 판단결과 0 또는 양수라고 판단되면 피엘엘 데이타를 현재의 값으로 고정시키고 음수이면 상기 제 5 과정으로 복귀하는 제 6 과정으로 이루어진 것을 특징으로 하는 디지탈 위성방송 수신기의 주파수 자동 미세 조성방법.A first step of reading the subtractor's determination value and determining that the value is 0, and fixing and outputting the PL data to the current value; and determining whether the value is positive if it is determined not to be zero by the first step. A second step of reducing the PL data by one step if the determination value of the subtraction part is positive by the second step and the second step, and receiving the determination value of the subtraction part again; If it is determined that the number is negative, the PEL data is fixed to the current value, and if the number is positive, the fourth step of returning to the third process and if the determination result determined by the second process is negative, increases the PEL data by one step. After the fifth step of inputting the subtraction part again and the determination result of the fifth step is 0 or positive, the PEL data is fixed to the current value. And a sixth step of returning to the fifth step if the number is zero. 마이크로 컴퓨터의 피엘엘 데이타를 입력받아 RF 신호를 중간주파수 신호로 변화하는 BS튜너와, 상기 BS튜너로부터 출력되는 중간주파수신호를 I와 Q신호로 분리한 다음 전압제어발진부의 출력과 믹싱하여 그에따른와신호를 출력하는 신호 분리부와, 상기 신호 분리부의 출력을 디지탈 신호로 변환하는 아날로그/디지탈 변환부와, 상기 아날로그/디지탈 변환부의 출력을 입력받아 I와 Q신호를 복조하여 출력하는 매칭 필터부와, 상기 매칭 필터부에서 출력되는 I와 Q신호의 위상에러를 검출하는 위상에러 검출부와, 상기 위상에러 검출부의 출력과 보정신호 발생부의 출력을 입력받아 이를 합산하여 일정직류전압으로 변환하는 루프필터와, 상기 루프필터의 출력을 입력받아 그에따라 전압제어 발진하여 출력하는 상기 전압제어발진부와, 상기 전압제어발진부의 출력을 입력받아 N분주하는 분주부와, 상기 분주부의 출력 및 리세트부의 리세트신호를 입력받아 기준구간마다 주파수 카운팅하는 카운터와, 기준구간마다 리세트신호를 발생하는 상기 리세트부와, 상기 카운터 및 상기 리세트부의 출력을 입력받아 그 카운터값의 크기를 판별하는 비교부와, 상기 비교부의 판별신호를 입력받아 그에따른 보정신호를 발생하는 상기 보정신호 발생부와, 시스템을 총괄제어하는 상기 마이크로 컴퓨터로 구성된 디지탈 위성방송 수신기에 있어서, 상기 루프필터의 직류전압을 인가받아 기준전압과 이를 비교함으로써 직류전압이 큰가 작은가를 판별하여 그에대한 판별값을 상기 마이크로 컴퓨터로 출력하는 전압판별부를 더 포함하여 구성한 것을 특징으로 하는 디지탈 위성방송 수신기의 주파수 자동 미세 조정장치.BS tuner that receives RF data of microcomputer and converts RF signal into intermediate frequency signal, and divides intermediate frequency signal outputted from BS tuner into I and Q signal, and then mixes with output of voltage controlled oscillator. Wow A signal separation unit for outputting a signal, an analog / digital conversion unit for converting the output of the signal separation unit into a digital signal, a matching filter unit for receiving the output of the analog / digital conversion unit and demodulating and outputting I and Q signals; A phase error detection unit for detecting a phase error of the I and Q signals output from the matching filter unit, a loop filter which receives the output of the phase error detection unit and the output of the correction signal generator, adds them, and converts them into a constant DC voltage; The voltage controlled oscillator for receiving the output of the loop filter and outputting the voltage controlled oscillation according to the output of the loop filter; A counter for receiving a signal and frequency counting for each reference section, the reset unit for generating a reset signal for each reference section, and the car And a comparator for receiving the output of the control unit and the reset unit and determining the magnitude of the counter value, the compensating signal generator for receiving the discrimination signal of the comparator and generating a correction signal according to the comparator; A digital satellite broadcasting receiver comprising a microcomputer, the apparatus further comprising: a voltage discriminating unit configured to determine whether the DC voltage is large or small by receiving the DC voltage of the loop filter and comparing it with a reference voltage, and output a determination value thereof to the microcomputer. Frequency automatic fine tuning device of a digital satellite broadcasting receiver, characterized in that configured by. 전압판별부의 판별값을 입력받아 저전위의 신호인지 아니면 고전위의 신호인지를 판단하는 제 1 과정과, 상기 제 1 과정에 의하여 고전위라고 판단되면 피엘엘 데이타를 한 스텝 감소시키는 제 2 과정과, 상기 제 2 과정 수행 후 전압판별부의 판별값을 재 입력받아 고전위의 신호인지 아니면 저전위의 신호인지를 판단하여 저전위의 신호이면 피엘엘 데이타를 현재의 값으로 고정하며 고전위의 신호이면 상기 제 2 과정으로 복귀하는 제 3 과정과, 상기 제 1 과정에 의하여 저전위의 신호라고 판단되면 피엘엘 데이타를 한 스텝 증가시키는 제 4 과정과, 상기 제 4 과정 수행 후 전압판별부의 판별값을 재 입력받아 고전위의 신호인지 아니면 저전위의 신호인지를 판단하여 고전위의 신호이면 피엘엘 데이타를 현재의 값으로 고정하며 저전위의 신호이면 상기 제 4 과정으로 복귀하는 제 5 과정으로 동작하는 것을 특징으로 하는 디지탈 위성방송 수신기의 주파수 자동 미세 조정방법.A first step of determining whether the signal is a low potential signal or a high potential signal by receiving the determination value of the voltage discriminator; and a second step of reducing the PEL data by one step if it is determined that the high potential signal is obtained by the first step; After performing the second process, the input value of the voltage discriminator is input again to determine whether it is a high potential signal or a low potential signal. If the signal is low potential, the PEL data is fixed to the current value. A third process of returning to the second process, a fourth process of increasing PEL data by one step if it is determined that the signal is low potential by the first process, and a determination value of the voltage discriminator after performing the fourth process. After re-input, it is determined whether the signal is high or low potential, and if the signal is high potential, the PEL data is fixed to the current value. A fourth process of the fifth process of how automatic frequency fine adjustment of the digital satellite broadcasting receiver, comprising a step of returning to the operation. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950047898A 1995-12-08 1995-12-08 Frequency automatic fine tuning device and method of digital satellite broadcasting receiver Expired - Fee Related KR0162437B1 (en)

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KR1019950047898A KR0162437B1 (en) 1995-12-08 1995-12-08 Frequency automatic fine tuning device and method of digital satellite broadcasting receiver

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Application Number Priority Date Filing Date Title
KR1019950047898A KR0162437B1 (en) 1995-12-08 1995-12-08 Frequency automatic fine tuning device and method of digital satellite broadcasting receiver

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KR970055331A true KR970055331A (en) 1997-07-31
KR0162437B1 KR0162437B1 (en) 1999-03-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100471307B1 (en) * 1997-12-31 2005-05-27 대우텔레텍(주) Intermediate frequency automatic control device in mobile terminal
KR100587791B1 (en) * 2004-12-08 2006-06-09 한국항공우주연구원 Frequency Transceiver for Intermediate Frequency Control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100471307B1 (en) * 1997-12-31 2005-05-27 대우텔레텍(주) Intermediate frequency automatic control device in mobile terminal
KR100587791B1 (en) * 2004-12-08 2006-06-09 한국항공우주연구원 Frequency Transceiver for Intermediate Frequency Control

Also Published As

Publication number Publication date
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