KR950030659A - Digital carrier recovery device for high definition television receiver - Google Patents

Digital carrier recovery device for high definition television receiver Download PDF

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Publication number
KR950030659A
KR950030659A KR1019940007633A KR19940007633A KR950030659A KR 950030659 A KR950030659 A KR 950030659A KR 1019940007633 A KR1019940007633 A KR 1019940007633A KR 19940007633 A KR19940007633 A KR 19940007633A KR 950030659 A KR950030659 A KR 950030659A
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South Korea
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signal
digital
fpll
output
intermediate frequency
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KR1019940007633A
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Korean (ko)
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KR0124595B1 (en
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허서원
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이헌조
엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • H04L27/066—Carrier recovery circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/12—Bandpass or bandstop filters with adjustable bandwidth and fixed centre frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0021—Frequency multipliers

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Television Systems (AREA)

Abstract

HDTV 수상기의 디지탈 반송파 복구장치가 제언되었다. 이 디지탈 반송파 복구장치는 수신된 복수개의 RF신호들중 하나를 선택하고 선택된 RF신호를 중간주파수 신호로 변환하여 출력하는 튜닝수단; 중간주파수 신호를 디지탈 신호로 변환시키는 A/D 변환수단, 디지탈 정현신호를 발생하는 발진수단, 그리고 디지탈 방식으로 소정의 알고리즘을 수행하여 디지탈 정현신호와 디지탈화된 중간주파수 신호의 주파수와 위상을 서로 동기시키기 위한 디지탈 루프제어신호를 출력하는 디지탈 FPLL수단을 구비한다.Digital carrier recovery apparatus of HDTV receiver has been suggested. The digital carrier recovery apparatus includes tuning means for selecting one of a plurality of received RF signals, converting the selected RF signal into an intermediate frequency signal, and outputting the intermediate frequency signal; A / D conversion means for converting an intermediate frequency signal into a digital signal, an oscillation means for generating a digital sine signal, and performing a predetermined algorithm in a digital manner to synchronize the frequencies and phases of the digital sine signal and the digitalized intermediate frequency signal with each other. And digital FPLL means for outputting a digital loop control signal.

Description

고선명 텔레비전 수상기의 디지탈 반송파복구장치Digital carrier recovery device for high definition television receiver

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

제1도는 종래 HDTV수상기의 반송파 복구장치를 나타내는 구성블럭도, 제7도는 NTSC영상방송파의 간섭을 제거하기 위한 종래 HDTV 수상기 반송파 복구장치의 구성블럭도, 제8도는 본 발명에 따른 HDTV 수상기의 반송파 복구장치의 제1실시예를 나타내는 구성블럭도, 제9도는 본 발명에 따른 HDTV 수상기의 반송파 복구장치의 제2실시예를 보여주는 구성블럭도.FIG. 1 is a block diagram showing a carrier recovery apparatus of a conventional HDTV receiver, FIG. 7 is a block diagram showing a carrier recovery apparatus of a conventional HDTV receiver for removing interference from NTSC video broadcasting waves, and FIG. 8 is a block diagram of a HDTV receiver according to the present invention. Fig. 9 is a block diagram showing the first embodiment of the carrier recovery apparatus. Fig. 9 is a block diagram showing the second embodiment of the carrier recovery apparatus of the HDTV receiver according to the present invention.

Claims (7)

수신된 복수개의 RF신호들중 하나를 선택하고 선택된 RF신호의 반송파를 입력된 루프제어신호에 따라서, 중간주파수신호를 변환하여 출력하는 튜닝수단(100), 중간주파수 신호를 디지탈 신호로 변환시키는 A/D변환수단(200), 디지탈 정현신호를 발생하는 발진수단(300), 그리고 디지탈 방식으로 소정의 알고리즘을 수행하여 상기 디지탈 정현신호와 상기 디지탈화된 중간주파수 신호의 주파수와 위상을 서로 동기시키기 위한 디지탈 루프 제어신호를 출력하는 디지탈 FPLL수단(400)을 구비함을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치.Tuning means 100 for selecting one of the plurality of received RF signals and converting the carrier frequency of the selected RF signal according to the input loop control signal, and converting the intermediate frequency signal to output the digital signal A. / D conversion means 200, oscillation means 300 for generating a digital sine signal, and performing a predetermined algorithm in a digital manner to synchronize the frequency and phase of the digital sine signal and the digitalized intermediate frequency signal to each other. A digital carrier recovery device for a high definition television receiver, characterized by comprising a digital FPLL means (400) for outputting a digital loop control signal. 제1항에 있어서, 디지탈 FPLL 수단(400)의 출력신호중 소정의 저주파수대역신호만을 통과시키는 디지탈 FPLL(500), 그리고 디지탈 FPLL(500)의 출력신호를 디지탈 신호로 변환하여 전압제어발진용 루프제어신호를 만들고 튜닝수단(100)에 제공하는 D/A변환수단(600)이 더 구비됨을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치.2. A predetermined low frequency band signal of the output signal of the digital FPLL means 400 according to claim 1 The digital FPLL 500 passing through the bay and the output signal of the digital FPLL 500 are converted into digital signals to generate a loop control signal for voltage controlled oscillation, and the D / A converting means 600 for providing the tuning means 100 Digital carrier recovery device of the high-definition television receiver further comprises. 제1항에 있어서, 튜닝수단(100)은 복수개의 RF신호들을 수신하는 안테나(100a),수신된 복수개의 RF신호들중 한 RF신호를 선택하고 상기 루프제어신호를 전압제어 발진신호로 입력하여 선택된 RF신호의 반송파를 중간주파수 신호로 변환시키는 튜너(100b), 및 입력된 전압제어발진용 루프제어신호에 따라서 튜너(100b)에 전압제어발진신호를 제공하는 전압제어발진기(100c)로 구성됨을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치The method of claim 1, wherein the tuning means 100 is selected from the antenna 100a for receiving a plurality of RF signals, one of the plurality of received RF signals, and inputs the loop control signal as a voltage controlled oscillation signal. A tuner 100b for converting a carrier of the selected RF signal into an intermediate frequency signal, and a voltage controlled oscillator 100c for providing a voltage controlled oscillation signal to the tuner 100b according to the input loop control signal for voltage controlled oscillation. Digital carrier recovery device of high definition television receiver 제1항에 있어서, 상기 FPLL은 발진수단(300)으로부터 디지탈 정보신호를 소정 각도만큼 위상시프트시켜 출력하는 위상시프터(400A), A/D변환수단(200)으로부터 출력된 디지탈 중간주파수신호와 위상시프터(400a)에 의해 위상시프트된 발진수단(300)의 디지탈 정현신호를 곱하여 I채널의 디지탈 비트(beat) 신호I(n)을 만드는 제1멀티플라이어(400b), A/D변환수단(200)으로 부터의 디지탈 중간주파수 신호와 발진수단(300)으로 부터의 디지탈 정현신호를 곱하여 Q채널의 디지탈 비트신호 Q(n)을 만드는 제2멀티플라이어(400c),I채널의 디지탈 비트신호I(n)으로부터 HDTV반송파를 포함하는 파일럿 신호만을 통과시키는 제1디지탈 LPF(400f), 디지탈 LPF(400d)로 부터 출력되는 파일럿 신호를 소정시간(nd) 만큼 지연시켜 출력하는 지연소자(400e), Q채널의 디지탈 비트신호 Q(n)으로 부터 HDTV 반송파를 포함하는 파일럿 신호만을 통과시키는 제2디지탈 LPF(400f), 지연소자(400e)의 출력신호와 제2디지탈 LPF(400f)의 출력신호를 곱하는 제3멀티플라이어(400g), 지연소자(400e)의 현재 출력신호와 직전의 출력신호의 차를 검출하여 출력하는 차동검출기(400h); 그리고 제3멀티플라이어(400g)와 차동검출기(400h)의 출력신호를 곱하여 그 결과를 루프제어신호로서 출력하는 제4멀티플라이어(400i)로 구성됨을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치.The FPLL of claim 1, wherein the FPLL phase shifts the digital information signal from the oscillation unit 300 by a predetermined angle and outputs the phase shifter 400A and the digital intermediate frequency signal and phase output from the A / D conversion unit 200. The first multiplier 400b and the A / D converting means 200 which multiply the digital sinusoidal signals of the oscillation means 300 phase shifted by the shifter 400a to produce the digital beat signal I (n) of the I channel. The second multiplier 400c for multiplying the digital intermediate frequency signal from the digital signal with the digital sinusoidal signal from the oscillation means 300 to form the digital bit signal Q (n) of the Q channel, and the digital bit signal I of the I channel. a first digital LPF 400f for passing only a pilot signal including an HDTV carrier from n), a delay element 400e for delaying and outputting a pilot signal output from the digital LPF 400d by a predetermined time (nd), and Q HD from digital bit signal Q (n) of channel A second digital LPF 400f for passing only a pilot signal including a TV carrier, a third multiplier 400g for multiplying the output signal of the delay element 400e with the output signal of the second digital LPF 400f, and a delay element ( A differential detector 400h for detecting and outputting a difference between the current output signal of 400e) and the immediately preceding output signal; And a fourth multiplier (400i) for multiplying the output signal of the third multiplier (400g) and the differential detector (400h) and outputting the result as a loop control signal. 제4항에 있어서, 상기 FPLL수단(400)은 FPLL수단(400)으로부터 수치제어발진용 루프제어신호를 얻기위해 지연소자(400e)와 제3멀티플라이어(400g)의 사이에 접속되어 지연소자(400e)의 출력신호의 부호에 따라 +1 또는 -1의 신호를 출력하는 양자화기(400k)를 더 구비함을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치.The FPLL means 400 is connected between the delay element 400e and the third multiplier 400g to obtain a numerically controlled oscillation loop control signal from the FPLL means 400. And a quantizer (400k) for outputting a signal of +1 or -1 in accordance with the sign of the output signal of 400e). 제4항에 있어서, 지연소자(400e)의 소정지연시간(nd)는 최대 주파수 편이를 고려하여 결정함을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치.5. The apparatus of claim 4, wherein the predetermined delay time (nd) of the delay element (400e) is determined in consideration of the maximum frequency shift. 제1항에 있어서, A/D 변환수단(200)의 샘플링 주파수는 튜닝수단(100)으로부터 출력되는 중간주파수 신호의 주파수 보다 4배의 주파수를 가지고 업 샘플링함을 특징으로 하는 고선명 텔레비전 수상기의 디지탈 반송파 복구장치.The digital frequency of the high-definition television receiver of claim 1, wherein the sampling frequency of the A / D conversion means 200 is upsampled at a frequency four times higher than that of the intermediate frequency signal output from the tuning means 100. Carrier recovery device. ※ 참고사항 : 최초출원 내용에 의하여 공개되는 것임.※ Note: This is to be disclosed by the original application.
KR1019940007633A 1994-04-12 1994-04-12 Recover apparatus of digital carrier in hdtv KR0124595B1 (en)

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Application Number Priority Date Filing Date Title
KR1019940007633A KR0124595B1 (en) 1994-04-12 1994-04-12 Recover apparatus of digital carrier in hdtv

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Application Number Priority Date Filing Date Title
KR1019940007633A KR0124595B1 (en) 1994-04-12 1994-04-12 Recover apparatus of digital carrier in hdtv

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KR950030659A true KR950030659A (en) 1995-11-24
KR0124595B1 KR0124595B1 (en) 1997-12-01

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