KR950002660B1 - Hdtv/ntsc reception automatic change apparatus - Google Patents

Hdtv/ntsc reception automatic change apparatus Download PDF

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KR950002660B1
KR950002660B1 KR1019900021229A KR900021229A KR950002660B1 KR 950002660 B1 KR950002660 B1 KR 950002660B1 KR 1019900021229 A KR1019900021229 A KR 1019900021229A KR 900021229 A KR900021229 A KR 900021229A KR 950002660 B1 KR950002660 B1 KR 950002660B1
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signal
synchronous
ntsc
hdtv
signals
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KR1019900021229A
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KR920014243A (en
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이기석
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삼성전자주식회사
강진구
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0125—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards being a high definition standard
    • 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
    • H03L7/08—Details of the phase-locked loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • 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
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/45—Generation or recovery of colour sub-carriers

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)

Abstract

In the TV receiver which can receive both HDTV signal and NTSC signal, the automatic switching unit switches automatically bewteen signal processing units to process two signals and generates the synchronous signals of two signals. The automatic switching unit comprises two processing units processing HDTV muse signal and NTSC signal; the two synchronous signal separating units generating synchronous signals from the received broadcasting signals; the first switching unit outputing the synchronous signal; the second switching unit outputing TV image signal.

Description

HDTV/NTSC 수신자동절환장치HDTV / NTSC receiver automatic switching device

제1도는 본 발명에 의한 수신자동절환장치의 전체구성블럭도.1 is an overall block diagram of a receiving automatic switching device according to the present invention.

제2도는 본 발명에 채용된 HDTV 동기신호분리부 및 제1동기신호 판정부의 상세구성블럭도.2 is a detailed block diagram of the HDTV synchronization signal separation unit and the first synchronization signal determination unit employed in the present invention.

제3도는 본 발명에 채용된 NTSC 동기신호분리부 및 제2동기신호 판정부의 상세구성블럭도.3 is a detailed block diagram of the NTSC synchronization signal separation unit and the second synchronization signal determination unit employed in the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : HDTV 동기신호분리부 20 : NTSC 동기신호분리부10: HDTV sync signal separator 20: NTSC sync signal separator

30 : HDTV 신호처리부 40 : NTSC 신호처리부30: HDTV signal processor 40: NTSC signal processor

50 : 제1동기신호판정부 60 : 제2동기신호판정부50: first synchronization signal determination unit 60: second synchronization signal determination unit

70 : 디코더부 80 : 제1절환부70: decoder unit 80: first switching unit

90 : 제2절환부 SW1, SW2, SW3 : 스위치90: second switching unit SW1, SW2, SW3: switch

11 : 프레임 동기신호 검출기 12, 22 : 위상비교기11 frame detector 12, 22 phase comparator

13, 23 : 루프필터 14, 24 : VCO13, 23: loop filter 14, 24: VCO

15 : 프레임 동기신호 발생기 16 : 수평/수직동기신호발생기15: frame sync signal generator 16: horizontal / vertical sync signal generator

21 : 칼라버스터 검출기 25 : 수평/수직동기신호 및 색부반송파발생기21: Color Buster Detector 25: Horizontal / Vertical Synchronous Signal and Color Carrier Generator

51 : 동기일치판별기 52 : 동기 플래그 출력기51: synchronous match discriminator 52: synchronous flag output unit

61 : 비교기 62 : 적분기61: comparator 62: integrator

본 발명은 수신자동절환장치에 관한 것으로, 특히 HDTV 방송신호 및 NTSC 방식을 겸하는 수신기에 있어서 상호간의 신호 호환성이 없는 두가지 신호를 수신할 수 있는 HDTV/NTSC 수신자동절환장치에 관한 것이다. 현재 HD-MUSE TV방송은 기존의 NTSC TV 방송과는 달리 위성을 이용한 색차신호전송방식의 고화질의 방송을 하고 있다. HDTV 방식의 수상기와 기존의 NTSC 방식의 수상기를 별도로 사용하여 각각의 신호를 수신하는 것을 향후 HDTV 방송과 기존의 방식이 병행될 때 일체화하여 겸용화할 필요가 있게 된다. 그러나, 현재까지 HD-TV 방송신호와 기존의 NTSC-TV 방송신호를 절환 토록하는 시도가 없었다.The present invention relates to a reception automatic switching device, and more particularly, to an HDTV / NTSC reception automatic switching device capable of receiving two signals having no signal compatibility with each other in a receiver serving both an HDTV broadcasting signal and an NTSC system. Currently, HD-MUSE TV broadcasts high-definition broadcasting using color difference signal transmission method using satellite, unlike NTSC TV broadcasting. Receiving each signal separately using the HDTV receiver and the conventional NTSC receiver will need to be integrated and combined when HDTV broadcasting and the conventional scheme are combined. However, no attempt has been made to switch between HD-TV broadcast signals and conventional NTSC-TV broadcast signals.

따라서, 본 발명은 HDTV 방송과 기존의 NTSC 방식을 겸하는 수신기에 있어서, 상호간의 신호 호환성이 없는 두가지 신호수신에 필요한 각각의 신호처리부를 자동적으로 절환하며 각각에 따른 동기신호를 재생하는 수신자동절환장치를 제공하는데 그 목적이 있다.Therefore, the present invention is a receiver for both HDTV broadcasting and the existing NTSC system, the automatic receiving device for automatically switching the respective signal processing unit required for two signal reception without signal compatibility between each other and reproduces the synchronization signal according to each The purpose is to provide.

상술한 목적을 달성하기 위하여, 본 발명의 수신자동절환장치는, HDTV 방송의 뮤즈신호를 영상 처리하는 제1신호처리수단과, NTSC 방송신호를 영상 처리하는 제2신호처리수단과, 뮤스신호의 동기신호를 분리하는 제1동기분리수단과, NTSC 방송신호의 동기신호를 처리하는 제2동기분리수단과, 제1동기처리수단 및 제2동기처리수단의 출력신호에 따라 HDTV 또는 NTSC 방송신호인지를 판별하는 제어수단과, 상기 제어수단의 제어신호에 따라 제1동기처리수단 및 제2동기처리수단을 절환하는 제1절환수단과, 상기 제어수단의 제어신호에 따라 제1신호처리수단 또는 제2신호처리수단을 절환하는 제2절환수단을 포함함을 특징으로 하고 있다.In order to achieve the above object, the reception automatic switching device of the present invention comprises a first signal processing means for video processing a mute signal of HDTV broadcasting, a second signal processing means for video processing an NTSC broadcast signal, and a mus signal. The first synchronous separation means for separating the synchronous signal, the second synchronous separation means for processing the synchronous signal of the NTSC broadcast signal, and whether it is an HDTV or NTSC broadcast signal according to the output signal of the first synchronous processing means and the second synchronous processing means. Control means for discriminating the control means, first switching means for switching the first synchronous processing means and the second synchronous processing means according to the control signal of the control means, and the first signal processing means or the first according to the control signal of the control means. And second switching means for switching the two signal processing means.

이하, 첨부된 도면을 참조하여 본 발명에 의한 HDTV/NTSC 수신자동절환 장치의 바람직한 실시예를 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the HDTV / NTSC reception automatic switching apparatus according to the present invention.

제1도는 본 발명에 의한 NTSC/HDTV 수신자동절환장치의 전체구성 블럭도이다.1 is a block diagram showing the overall configuration of the NTSC / HDTV receiver automatic switching device according to the present invention.

제1도에 의하면, HDTV 동기신호분리부(10)는 입력신호중 제1라인과 제2라인에 실린 화면 프레임 동기신호를 검출하여 PPL(Phase Locked Loop)에 의해 수평 및 수직동기신호를 분리한다.Referring to FIG. 1, the HDTV sync signal separator 10 detects screen frame sync signals on a first line and a second line among input signals, and separates horizontal and vertical sync signals by a phase locked loop (PPL).

NTSC 동기신호분리부(20)는 입력신호중 색부반송파신호를 검출하여 PLL에 의해 수평 및 수직동기신호를 분리한다.The NTSC sync signal separator 20 detects the color carrier signal from the input signal and separates the horizontal and vertical sync signals by the PLL.

HDTV 신호처리부(30)는 HDTV 방송의 뮤즈신호를 영상처리한다.The HDTV signal processor 30 image-processes the muse signal of the HDTV broadcast.

NTSC 신호처리부(40)는 NTSC 방송신호를 영상처리한다.The NTSC signal processor 40 processes the NTSC broadcast signal.

제1동기판정부(50)는 HDTV 동기신호분리부(10)에서 분리된 프레임 동기신호와 내부에서 발생된 프레임 동기신호를 비교하여 HDTV 뮤즈방송신호임을 나타내는 플래그신호를 출력한다.The first synchronizing unit 50 compares the frame synchronizing signal separated by the HDTV synchronizing signal separation unit 10 with the frame synchronizing signal generated therein, and outputs a flag signal indicating that it is an HDTV mute broadcasting signal.

제2동기판정부(60)는 상기 NTSC 동기신호분리부(20)의 출력신호와 내부에서 발생된 색부반송파신호를 비교하여 NTSC 방송신호임을 나타내는 플래그신호를 출력한다.The second synchronization unit 60 compares the output signal of the NTSC synchronization signal separator 20 with the color carrier signal generated therein and outputs a flag signal indicating that it is an NTSC broadcast signal.

디코더부(70)는 상기 제1동기판정부(50) 및 제2동기판정부(60)의 출력 신호를 디코딩하여 제1절환부(80) 및 제2절환부(90)에 제어신호를 출력 한다.The decoder 70 decodes the output signals of the first and second synchronization units 50 and 60 and outputs control signals to the first and second switching units 80 and 90. do.

제1절환부(80)는 HDTV 동기신호분리부(10) 및 NTSC 동기신호분리부(20)의 출력신호를 절환하는 스위치(SW1)로 되어 있다.The first switching unit 80 is a switch SW1 for switching the output signals of the HDTV synchronization signal separation unit 10 and the NTSC synchronization signal separation unit 20.

제2절환부(90)는 HDTV 신호처리부(30) 및 NTSC 신호처리부(40)의 출력신호를 절환하는 스위치(SW2,SW3)로 되어 있다.The second switching unit 90 includes switches SW2 and SW3 for switching the output signals of the HDTV signal processing unit 30 and the NTSC signal processing unit 40.

제2도는 본 발명에 채용된 HDTV 동기신호분리부 및 제1동기판정부의 상세구성블럭도이다.2 is a detailed block diagram of the HDTV synchronization signal separation unit and the first synchronization substrate employed in the present invention.

제2도에 의하면, HDTV 동기신호분리부(10)는 입력신호가 양자화되어 1125라인에 실려있는 영상신호중 1라인과 2라인에 실려있는 프레임 동기신호를 검출하는 프레임 동기신호 검출기(11)와, 입력신호의 위상차에 대응할 수 있는 전압을 발생시키는 지역통과 필터로 구성되어 있는 위상비교기(12)와, 상기 위상비교기(12)에서 생기는 고주파성분을 제거하는 루프필터(13)와, 상기 루프필터(13)의 제어전압에 의해 발진주파수가 변화하는 전압제어발진기(Voltage Controlled Oscillator : 이하 VCO라고 함)(14)와, 상기 VCO(14)의 출력신호에 따라 프레임 동기신호를 발생시키는 프레임 동기발생기(15)와, 상기 VCO(14)의 출력에 따라 33.75KHz의 수평동기신호와 60Hz의 수직동기신호를 발생하는 수평/수직동기신호발생기(16)로 되어있다.Referring to FIG. 2, the HDTV sync signal separator 10 includes a frame sync signal detector 11 for detecting a frame sync signal on lines 1 and 2 of an image signal quantized and loaded on line 1125; A phase comparator 12 comprising a local pass filter for generating a voltage corresponding to the phase difference of the input signal, a loop filter 13 for removing high frequency components generated by the phase comparator 12, and the loop filter ( Voltage controlled oscillator (VCO) 14 whose oscillation frequency is changed by the control voltage of 13) and a frame synchronization generator for generating a frame synchronization signal according to the output signal of the VCO 14 15) and a horizontal / vertical synchronous signal generator 16 for generating a horizontal synchronous signal of 33.75 KHz and a vertical synchronous signal of 60 Hz in accordance with the output of the VCO 14.

제1동기판정부(50)는 프레임 동기검출기(11)의 현재 입력되는 신호의 프레임 동기신호와 프레임 동기신호 발생기(15)에서 발생된 내부 프레임 동기신호를 비교하는 동기일치판별기(51)와, 상기 동기일치판별기(51)에서 비교된 신호에 따라 동기플래그신호를 출력하는 동기플래그출력기(52)로 되어 있다.The first synchronizing unit 50 includes a synchronizing matcher 51 for comparing the frame synchronizing signal of the signal currently input by the frame synchronizing detector 11 with the internal frame synchronizing signal generated by the frame synchronizing signal generator 15. The synchronous flag output unit 52 outputs a synchronous flag signal in accordance with the signal compared by the synchronous match discriminator 51.

제3도는 본 발명에 채용된 NTSC 동기분리부 및 제2동기판정부의 상기 구성블럭도이다.3 is a block diagram of the NTSC synchronization separation unit and the second synchronization substrate employed in the present invention.

제3도에 의하면, 제2동기처리부(20)는 입력되는 신호의 3.58MHz 색부반송파신호를 추출하는 색부반송파추출기(21)의, 위상비교기(22), 루프필터(23), VCO(24)의 구성은 제2도에 도시된 위상비교기(12), 루프필터(13), VC0(14)의 구성과 같고, VC0(24)의 출력에 따라 색부반송파, 수평 및 수직동기신호를 출력하는 수평/수직동기신호 및 색부반송파발생기(25)로 되어있다.Referring to FIG. 3, the second synchronization processing unit 20 includes a phase comparator 22, a loop filter 23, and a VCO 24 of the color carrier carrier extractor 21, which extracts a 3.58 MHz color carrier signal of the input signal. The configuration of is the same as that of the phase comparator 12, the loop filter 13, and the VC0 14 shown in FIG. 2, and outputs the color carrier, horizontal and vertical synchronization signals according to the output of the VC0 24. / Vertical synchronization signal and color carrier generator (25).

제2동기판정부(60)는 상기 위상비교기(31)에 현재 입력되는 신호의 색부반송파와 수평/수직동기신호 및 색부반송발생기(25)에서 발생된 색부반송파의 위상을 비교한 차 값을 출력하는 비교기(61)와, 상기 비교기(61)의 출력값을 적분하는 적분기(62)로 되어있다. 본 발명에 의한 수신자동절환장치의 동작에 대하여 제1도 내지 제3도 결부시켜 설명하기로 한다.The second synchronization unit 60 outputs a difference value comparing the phase of the color carrier of the signal currently input to the phase comparator 31 with the phase of the color / carrier generated from the horizontal / vertical synchronization signal and the color carrier carrier 25. Comparator 61 and an integrator 62 for integrating the output value of the comparator 61. The operation of the automatic receiving device according to the present invention will be described with reference to FIGS. 1 to 3.

제1도 내지 제3도에 의하면, 신호입력단(1)에 HDTV 방송신호인 뮤즈신호 또는 NTSC 방송신호가 입력되면, HDTV 동기신호분리부(10) 및 NTSC 동기신호분리(20)에 동시에 입력된다. HDTV의 뮤즈신호인 경우는 제2도에 도시된 바와 같이, 프레임 동기검출기(11)에서는 1라인과 2라인에 실려 있는 화면을 나타내는 제어신호인 프레임 동기신호를 검출하게 되며, 위상비교기(12), 루프필터(13), VCO(14) 및 프레임 동기발생기(15)에 의하여 입력신호에 동기된 내부프레임 동기신호를 재생하여 동기 일치판별기(51)에 출력한다.1 to 3, when a mute signal or NTSC broadcast signal, which is an HDTV broadcast signal, is input to the signal input terminal 1, the HDTV sync signal separator 10 and the NTSC sync signal separator 20 are simultaneously input. . In the case of the mute signal of the HDTV, as shown in FIG. 2, the frame synchronization detector 11 detects a frame synchronization signal, which is a control signal representing a screen on one and two lines, and the phase comparator 12. The internal filter synchronous signal synchronized with the input signal is reproduced by the loop filter 13, the VCO 14 and the frame synchronous generator 15, and output to the synchronous match discriminator 51.

동기일치판별기(51)에서는 입력신호로부터 추출된 동기신호와 내부에서 발생한 프레임 동기신호를 비교하여 동기가 일치하게 되면 HDTV 신호가 입력된 것으로 판단한다.The synchronization match determiner 51 compares the synchronization signal extracted from the input signal with the frame synchronization signal generated therein and determines that the HDTV signal is input when the synchronization is identical.

동기 플래그 출력기(52)에서는 현재 입력되는 신호가 프레임 동기신호와 일치하여 HDTV 방송신호가 입력된 것으로 판정되며, 동기플래그신호를 HDTV 방송신호 입력시는 "로우(0)"를 출력하고 기타의 경우는 "하이(0)"를 출력한다.In the sync flag output unit 52, it is determined that the HDTV broadcast signal is input because the currently input signal matches the frame sync signal, and when the HDTV broadcast signal is input, the sync flag signal outputs a low (0). Outputs "high (0)".

한편, 제3도에 도시된 바와 같이, NTSC 신호가 입력되면 NTSC 동기신호분리부(20)의 색부반송파추출기(21)에서 3.58MHz 색부반송파를 검출한다.On the other hand, as shown in FIG. 3, when the NTSC signal is input, the color carrier carrier extractor 21 of the NTSC sync signal separator 20 detects the 3.58 MHz color carrier.

색부반송파는 위상비교기(22)에 입력되고, 루프필터(23), VCO(24), 수평/수직동기 신호 및 색부반송파발생기(25)의 피이드백루프에 의하여 발생된 색부반송파와 색부반송파추출기(21)의 출력신호와 위상비교하게된다.The color carrier is input to the phase comparator 22, and the color carrier and the color carrier extractor (generated by the loop filter 23, the VCO 24, the horizontal / vertical synchronization signal and the feedback loop of the color carrier carrier 25). The phase is compared with the output signal of 21).

비교시(61)에서는 신호입력(1)에 NTSC 신호가 입력될때의 출력값은 "0"이 되며, 적분기(62)에서는 NTSC이외의 신호입력시는 위상비교기(22)로 부터 "0"이 아닌 일정치 않은 값이 출력된 값을 적분하게 되고, NTSC 동기플래그신호는 "1"이 되어 NTSC이외의 신호임을 나타낸다.In the comparison 61, when the NTSC signal is input to the signal input 1, the output value is "0", and in the integrator 62, when the signal input other than NTSC is not "0" from the phase comparator 22, The non-uniform value integrates the output value, and the NTSC sync flag signal becomes "1", indicating that the signal is other than NTSC.

디코더부(70)에서는 상기 동기플래그출력기(52) 및 적분기(62)로 부터 출력되는 논리신호를 디코딩하여 제1스위치 내지 제3스위치(SW1∼SW3)의 절환동작을 제어하게 된다.The decoder 70 decodes the logic signals output from the sync flag output unit 52 and the integrator 62 to control switching operations of the first to third switches SW1 to SW3.

여기서, 제1스위치 내지 제3스위치(SW∼SW3)의 동작상태는 아래(별표)에 도시된 바와 같다.Here, the operating states of the first to third switches SW to SW3 are as shown below (asterisk).

[별표][asterisk]

상기 별표에 도시된 바와 같이 HDTV 동기플래그신호 및 NTSC 동기플래그신호에 의하여 HDTV 신호입력시에는 HDTV 동기신호분리부(10) 및 HDTV 신호처리부(30)로 부터 HDTV신호와 HDTV 동기신호가 출력되도록 스위치(SW1∼SW3)가 동작한다.As shown in the asterisk, when the HDTV signal is input by the HDTV sync flag signal and the NTSC sync flag signal, the HDTV signal and the HDTV sync signal are output from the HDTV sync signal separator 10 and the HDTV signal processor 30. (SW1 to SW3) operate.

NTSC 신호입력시에는 NTSC 동기신호분리부(20) 및 NTSC 신호처리부(40)로 부터 NTSC 영상신호 및 NTSC 동기신호가 출력되어 모니터에 화상이 재현된다.When the NTSC signal is input, NTSC video signals and NTSC sync signals are output from the NTSC sync signal separator 20 and NTSC signal processor 40 to reproduce an image on the monitor.

이상으로 상술한 바와 같이 본 발명에 의한 HDTV/NTSC 수신 자동절환장치는 HDTV와 NTSC 방송신호를 공용하여 수신할 수 있는 수상기에서 채널절환 조작면에 의하여 HDTV 및 NTSC 방송신호를 자동적으로 선택하여 볼 수 있게 된다.As described above, the HDTV / NTSC reception automatic switching device according to the present invention can automatically select and view HDTV and NTSC broadcast signals by the channel switching operation surface on a receiver that can receive HDTV and NTSC broadcast signals in common. Will be.

또한, 본 발명은 HDTV 및 NTSC 이외의 기타신호나 무신호시는 자동적으로 화상이 흑레벨로 바뀌게되어 무신호 및 시스템 이상에 대하여 즉시 진단이 가능하며 채널절환이 순간등에 대응할 수 있다.In addition, the present invention automatically changes the image to a black level when other signals or no signals other than HDTV and NTSC, it is possible to immediately diagnose the non-signal and system abnormality, and the channel switching can correspond to the moment.

Claims (3)

HDTV 방송신호인 뮤스신호를 영상처리하는 제1신호처리수단과, NTSC 방송신호를 영상 처리하는 제2신호처리수단과, 뮤즈신호의 동기신호를 분리하는 제1동기분리수단과, NTSC 방송신호의 동기신호를 분리하는 제2동기분리수단과, 상기 제1동기분리수단 및 제2동기분리수단의 출력신호와 입력신호와의 동기여부를 판정하여 HD-MUSE 방송 또는 NTSC 방송인지를 판별하는 제어수단과, 상기 제어수단의 제어수단에 의해 제1동기분리수단 및 제2동기분리수단의 출력신호를 절환하여 동기신호를 출력하는 제1절환수단과, 상기 제어수단의 제어신호에 의해 제1신호처리수단 및 제2신호처리수단을 절환하여 영상신호를 출력하는 제2절환수단을 포함함을 특징으로 하는 HDTV/NTSC 수신자동절환장치.First signal processing means for image processing a mus signal, which is an HDTV broadcast signal, second signal processing means for image processing an NTSC broadcast signal, first synchronous separation means for separating a synchronous signal of a mute signal, and NTSC broadcast signal Second synchronous separation means for separating the synchronous signal, and control means for determining whether the output signal and the input signal of the first synchronous separation means and the second synchronous separation means are synchronized with each other to determine whether it is an HD-MUSE broadcast or an NTSC broadcast. And first switching means for outputting a synchronous signal by switching output signals of the first synchronous separating means and the second synchronous separating means by the control means of the control means, and the first signal processing by the control signal of the control means. And second switching means for switching the means and the second signal processing means to output an image signal. 제1항에 있어서, 제1동기분리수단은 입력신호의 프레임 동기신호를 검출하는 프레임 동기검출기와, 내부의 프레임 동기신호를 발생하는 PLL(Phase Locked Loop)회로와, 상기 pll회로의 제어신호에 따라 수평 및 수직동기신호를 발생시키는 수평 및 수직동기신호발생기를 포함함을 특징으로 하는 HDTV/NTSC수신 자동절환장치.2. The apparatus of claim 1, wherein the first synchronization separating means comprises: a frame synchronization detector for detecting a frame synchronization signal of an input signal, a phase locked loop (PLL) circuit for generating an internal frame synchronization signal, and a control signal of the pll circuit; HDTV / NTSC receiving automatic switching device comprising a horizontal and vertical synchronous signal generator for generating a horizontal and vertical synchronous signal according to. 제1항에 있어서, 제2동기분리수단은 입력신호의 색부반송파신호를 검출하는 색부반송파검출기와, 수평 및 수직동기신호와 색부반송파를 발생하는 PLL 회로를 포함함을 특징으로 하는 HDTV/NTSC 수신자동절환장치.2. The HDTV / NTSC reception according to claim 1, wherein the second synchronous separation means includes a color carrier detector for detecting a color carrier signal of an input signal, and a PLL circuit for generating horizontal and vertical synchronous signals and a color carrier. Automatic change over device.
KR1019900021229A 1990-12-20 1990-12-20 Hdtv/ntsc reception automatic change apparatus KR950002660B1 (en)

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KR920014243A KR920014243A (en) 1992-07-30
KR950002660B1 true KR950002660B1 (en) 1995-03-24

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