KR940004394Y1 - Comb filter loss protection apparatus when pseudo secam signal is reproduced - Google Patents
Comb filter loss protection apparatus when pseudo secam signal is reproduced Download PDFInfo
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- KR940004394Y1 KR940004394Y1 KR2019910013214U KR910013214U KR940004394Y1 KR 940004394 Y1 KR940004394 Y1 KR 940004394Y1 KR 2019910013214 U KR2019910013214 U KR 2019910013214U KR 910013214 U KR910013214 U KR 910013214U KR 940004394 Y1 KR940004394 Y1 KR 940004394Y1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
- H04N9/7925—Processing of colour television signals in connection with recording for more than one processing mode for more than one standard
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
- H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
- H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
- H04N9/8047—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction using transform coding
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Abstract
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Description
제1도는 본 고안에 의한 콤손실방지회로의 회로도.1 is a circuit diagram of the comb loss prevention circuit according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 주변환기 20 : 콤필터구동부10: peripheral ventilation 20: comb filter drive unit
30 : 콤필터 50 : 재생증폭기30: comb filter 50: regenerative amplifier
60 : PAL/SECAM판별부 70 : 혼합기60: PAL / SECAM discrimination unit 70: mixer
본 고안은 영상기록재생장치에 있어서 의사 SECAM재생시 콤손실방지회로에 관한 것으로, 특히 PAL용 영상기록재생장치에 있어서 PAL/SECAM판별회로를 이용하여 의사 SECAM재생시 콤필터에 의한 콤손실을 방지하기 위한 회로에 관한 것이다.The present invention relates to a comb loss prevention circuit for pseudo SECAM reproduction in an image recording / playback apparatus. In particular, a PAL / SECAM discrimination circuit is used in a PAL image recording / playback apparatus to prevent comb loss caused by a comb filter during pseudo SECAM reproduction. It relates to a circuit for performing.
일반적으로 PAL용 비디오카세트레코더(VCR)에서 SECAM신호를 기록하는 것이 가능하다. 이 방식은 MESCAM(일명 의사 SECAM)방식이라고 부르고 있다. 수신된 신호가 SECAM인지 또는 PAL인지를 판별ㆍ검출하여 SECAM신호인 경우 PAL로 테이프에 기록하게 된다.In general, it is possible to record a SECAM signal in a PAL video cassette recorder (VCR). This method is called MESCAM (aka pseudo SECAM) method. If the received signal is SECAM or PAL, it is determined and detected. If it is a SECAM signal, it is recorded on the tape as PAL.
따라서, 이 테이프에 기록된 신호를 재생하고자 하는 경우 PAL로 기록된 색신호를 SECAM으로 변조하여 출력하므로 기존의 의사 SECAM신호로 기록되어지는 것은 라인마다 위상에 정확한 상관성이 없기 때문에 PAL 또는 NTSC방식처럼 라인 상관을 이용한 누화(Crosstalk)를 제거하고자 하는 콤필터가 불필요하다.Therefore, if you want to reproduce the signal recorded on this tape, the color signal recorded by PAL is modulated and output by SECAM. Therefore, because the existing pseudo SECAM signal is not accurately correlated to the phase for each line, the line is like the PAL or NTSC method. There is no need for a comb filter to remove crosstalk using correlation.
여기서, PAL신호는 라인(Line) 상관성이 있기 때문에 1H(수평주사기간) 전의 신호와 현재의 신호와의 칼라버스트 위상차가 180°가 되어 두 신호를 가산하면 칼라버스트가 없어진다. 그리고 SECAM신호는 라인상관성이 없으므로 1H 전의 신호와 현재의 신호를 가산하면 신호의 레벨이 2배로 되는 특징이 있다.Here, since the PAL signal has a line correlation, the color burst phase difference between the signal before 1H (horizontal scanning period) and the present signal becomes 180 degrees, and the color burst is eliminated when the two signals are added. Since the SECAM signal has no line correlation, the signal level is doubled by adding the signal before 1H and the current signal.
그러나, 종래에는 PAL용의 VTR에서 의사 SECAM신호로 기록된 테이프를 재생할때 누화를 제거하는 콤필터를 공용화하고 있다. 따라서 의사 SECAM신호 재생시 이 콤필터에 의한 콤손실이 재생출력에 영향을 미치므로 화질의 열화가 생기는 문제점이 있었다.However, conventionally, a comb filter for eliminating crosstalk when reproducing a tape recorded with a pseudo SECAM signal in a PTR VTR is commonly used. Therefore, when the pseudo SECAM signal is reproduced, the comb loss caused by this comb filter affects the reproduction output, resulting in deterioration of image quality.
상술한 문제점을 극복하기 위하여, 본 고안의 목적은 PAL용 기록재생장치에 있어서 의사 SECAM신호 재생시 PAL/SECAM판별회로를 이용하여 의사 SECAM신호는 콤필터를 거치지 않도록 제어하여 콤필터에 의한 콤손실을 방지하는 회로를 제공하는데 있다.In order to overcome the above-mentioned problems, an object of the present invention is to control the pseudo SECAM signal not to go through the comb filter when the pseudo SECAM signal is reproduced in the PAL recording and reproducing apparatus, so that the comb loss is caused by the comb filter. It is to provide a circuit for preventing.
상술한 목적을 달성하기 위하여, 본 고안은 PAL 및 의사 SECAM방식의 영상신호를 기록 및 재생할 수 있는 영상기록재생장치에 있어서, 기록매체로부터 재생된 재생신호를 영상재생신호를 변환하기 위한 신호변환수단 ; 상기 신호변환수단으로부터 출력되는 영상색신호를 증폭하기 위한 증폭수단 ; 상기 증폭수단으로부터 출력되는 영상색신호의 크로스토크를 제거하기 위한 콤필터 ; 상기 콤필터의 출력을 버퍼링하기 위한 제1버퍼증폭기 ; 상기 증폭수단의 출력을 버퍼링하기 위한 제2버퍼증폭기 ; 상기 제1 및 제2버퍼증폭기의 출력신호를 증폭하기 위한 재생증폭기 ; 상기 재생증폭기에서 출력되는 영상색신호와 휘도신호를 혼합하여 복합영상신호를 발생하기 위한 혼합기 ; 상기 재생증폭기의 출력신호가 PAL방식인지 의사 SECAM방식인지를 판별하여 제어신호를 발생하기 위한 신호판별수단 ; 상기 신호판별수단의 제어신호에 응답하여 PAL방식일 때는 상기 제2버퍼증폭기의 입력을 뮤팅하고, 의사 SECAM방식일 때는 상기 제1버퍼증폭기의 입력을 뮤팅하기 위한 신호뮤트수단을 구비함을 특징으로 한다.In order to achieve the above object, the present invention is a video recording and reproducing apparatus capable of recording and reproducing video signals of PAL and pseudo SECAM methods, the signal converting means for converting a video playback signal from a playback signal reproduced from a recording medium. ; Amplifying means for amplifying the video color signal output from the signal converting means; A comb filter for removing crosstalk of an image color signal output from the amplifying means; A first buffer amplifier for buffering the output of the comb filter; A second buffer amplifier for buffering the output of the amplifying means; A reproduction amplifier for amplifying the output signals of the first and second buffer amplifiers; A mixer for generating a composite image signal by mixing the image color signal and the luminance signal outputted from the reproduction amplifier; Signal discriminating means for discriminating whether the output signal of the regenerative amplifier is a PAL method or a pseudo SECAM method to generate a control signal; And a signal muting means for muting the input of the second buffer amplifier in the PAL scheme in response to the control signal of the signal discriminating means, and muting the input of the first buffer amplifier in the pseudo SECAM scheme. do.
이하, 첨부된 도면을 참조하여 본 고안에 의한 의사 SECAM신호 재생시 콤손실방지회로의 바람직한 실시예를 설명하기로 한다.Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the comb loss prevention circuit upon reproduction of the pseudo SECAM signal according to the present invention.
제1도는 본 고안에 의한 의사 SECAM신호 재생시 콤손실 방지회로의 회로도이다.1 is a circuit diagram of a comb loss prevention circuit during reproduction of a pseudo SECAM signal according to the present invention.
제1도에 의하면, 입력단자(11)는 신호입력원(도시되지 않음)에 결합되어 있다. 이 입력단자(11)는 주변환기(10)의 입력단자에 결합되고, 주변환기(10)의 출력단자는 콤필터구동부(20)의 입력단자에 접속된다.According to FIG. 1, the input terminal 11 is coupled to a signal input source (not shown). The input terminal 11 is coupled to the input terminal of the peripheral ventilation 10, the output terminal of the peripheral ventilation 10 is connected to the input terminal of the comb filter driver 20.
콤필터(30)의 입력단자는 상기 콤필터구동부(20)의 출력단자에 절환부(40)에 각각 결합되어 있다.Input terminals of the comb filter 30 are respectively coupled to the switching unit 40 to the output terminal of the comb filter driver 20.
상기 절환부(40)는, 콜렉터저항(R2)은 상기 콤필터(30)의 출력단자 및 저항(R1)의 타단사이에 연결되고, 에미터단은 접지되며, 베이스단은 PAL/SECAM판별부(60)의 출력단자에 접속되어 있는 트랜지스터(Q3)와, 콜렉터저항(R3)은 상기 콤필터구동부(20)의 출력단자에 연결되며, 에미터단은 접지되어 있는 트랜지스터(Q4)와, 베이스단들은 상기 저항(R1) 및 상기 버퍼용 트랜지스터(Q4)에 접속되며 콜렉터단들은 공급전원단(B+)에 연결되고, 에미터단들은 전류원(Is)에 연결되어 있는 차등증폭기(Q1, Q2)와, 베이스저항(R5)은 PAL/SECAM판별부(60)의 출력단에 연결되고, 콜렉터저항(R4)은 공급전원단(B+)에 연결되며, 에미터단은 접지되어 있는 트랜지스터(Q5)로 되어 있다.The switching unit 40, the collector resistor (R2) is connected between the output terminal of the comb filter 30 and the other end of the resistor (R1), the emitter end is grounded, the base end is PAL / SECAM discriminating unit ( The transistor Q3 and the collector resistor R3 connected to the output terminal of 60 are connected to the output terminal of the comb filter driver 20. The emitter terminal is connected to the grounded transistor Q4 and the base terminals. Differential amplifiers Q1 and Q2 connected to the resistor R1 and the buffer transistor Q4, the collector terminals of which are connected to a supply power supply terminal B + , and the emitter terminals of which are connected to a current source Is; The base resistor R5 is connected to the output terminal of the PAL / SECAM discriminator 60, the collector resistor R4 is connected to the supply power supply terminal B + , and the emitter terminal is a grounded transistor Q5. .
재생증폭기(50)의 입력단자는 상기 차등증폭기(Q2, Q3)의 에미터단에 접속되고, 제1출력단자는 상기 PAL/SECAM판별부(60)의 입력단자에 제2출력단자는 혼합기(70)의 제1입력단자에 접속된다.The input terminal of the regenerative amplifier 50 is connected to the emitter terminals of the differential amplifiers Q2 and Q3, and the first output terminal is connected to the input terminal of the PAL / SECAM discrimination unit 60, and the second output terminal is connected to the mixer 70. It is connected to the first input terminal.
상기 혼합기(70)의 제2입력단자는 휘도신호처리회로(도시되지 않음)에 결합되어 있다.The second input terminal of the mixer 70 is coupled to a luminance signal processing circuit (not shown).
출력단자(71)는 상기 혼합기(70)의 출력단자에 접속되고 복합영상신호가 출력된다.The output terminal 71 is connected to the output terminal of the mixer 70 and a composite video signal is output.
이어서 제1도의 동작을 살펴보면, 주변환기(10)에서는 신호입력원으로부터 전송되는 신호가 PAL신호형태로 기록된 의사 SECAM신호인 경우, 이 신호를 전치증폭기(도시되지 않음)에서 증폭하고 색신호 재생프로세서(도시되지 않음)를 통해 유입한다.Subsequently, the operation of FIG. 1 shows that, in the peripheral ventilation unit 10, if the signal transmitted from the signal input source is a pseudo SECAM signal recorded in the form of PAL signal, the signal is amplified by a preamplifier (not shown) and the color signal reproducing processor is performed. Ingress through (not shown).
콤필터구동부(20)에서는 콤필터(30)의 콤손실을 보상하기 위해 상기 주변환기(10)의 출력신호를 증폭한 후 상기 콤필터(30)의 입력단자 및 트랜지스터(Q4)의 콜렉터단에 인가된다.The comb filter driver 20 amplifies the output signal of the peripheral ventilation 10 to compensate for the comb loss of the comb filter 30, and then inputs the input terminal of the comb filter 30 and the collector terminal of the transistor Q4. Is approved.
여기서, PAL/SECAM판별부(60)는 이미 삼성전자(주)에 의해 출원된 대한민국 실용신안 출원번호 제89-21326호 및 89-19126호에 개시되어 있으므로 여기서는 PAL/SECAM판별부(60)의 기능과 동작을 생략하기로 한다. 다만, 재생되는 신호가 SECAM인 경우 PAL/SECAM판별부(60)로부터 “하이”논리신호가 출력되고, PAL인 경우에는 “로우”논리신호가 출력된다.Here, the PAL / SECAM discrimination unit 60 is disclosed in Korean Utility Model Application Nos. 89-21326 and 89-19126 already filed by Samsung Electronics Co., Ltd. Functions and operations will be omitted. However, if the signal to be reproduced is SECAM, the "high" logic signal is output from the PAL / SECAM discrimination unit 60, and if it is PAL, the "low" logic signal is output.
이때, PAL/SECAM판별부(30)으로부터 출력되는 신호가 “하이”논리신호가 출력되면 트랜지스터(Q5)는 도통되고, 트랜지스터(Q4)는 베이스단에 “로우”상태의 신호가 입력되므로 차단된다.At this time, when the "high" logic signal is output from the PAL / SECAM discriminator 30, the transistor Q5 is turned on and the transistor Q4 is cut off because the signal of the "low" state is input to the base end. .
트랜지스터(Q2)는 도통되어 상기 콤필터구동부(20)의 출력신호 즉, 콤필터를 통과하지 않은 SECAM신호가 재생증폭기(50)에 입력된다.The transistor Q2 is turned on so that the output signal of the comb filter driver 20, that is, the SECAM signal that does not pass through the comb filter, is input to the regeneration amplifier 50.
혼합기(70)에서는 상기 재생증폭기(50)로부터 출력되는 색신호와 휘도신호처리회로로부터 출력되는 휘도신호를 혼합하여 의사 SECAM신호인 복합영상신호가 출력된다.The mixer 70 mixes the color signal output from the reproduction amplifier 50 and the luminance signal output from the luminance signal processing circuit to output a composite video signal which is a pseudo SECAM signal.
한편, PAL/SECAM판별부(50)의 출력신호가 “로우”상태의 논리신호가 출력되면 트랜지스터(Q5)는 턴오프되고, 트랜지스터(Q4)의 베이스단은 “하이”상태의 논리신호가 입력되므로 트랜지스터(Q4)는 도통된다.On the other hand, when the logic signal of the output signal of the PAL / SECAM discrimination unit 50 is in the "low" state, the transistor Q5 is turned off, and the logic terminal in the "high" state is input to the base terminal of the transistor Q4. Therefore, transistor Q4 is turned on.
따라서, 콤필터구동부(20)로부터 출력되는 신호가 출력되지 않고, 트랜지스터(Q3)가 차단되므로 콤필터(30)로부터 출력되는 신호, 즉 PAL신호가 각 채널간 중첩된 크로스토크를 억제하며 트랜지스터(Q1)의 베이스단에 유입된다.Accordingly, since the signal output from the comb filter driver 20 is not output and the transistor Q3 is cut off, the signal output from the comb filter 30, that is, the PAL signal, suppresses the crosstalk in which the channels overlap each other, and the transistor ( It flows into the base end of Q1).
상기 콤필터(30)의 출력이 차등증폭기(Q1)를 통해 재생증폭기(50)에 입력된다.The output of the comb filter 30 is input to the regeneration amplifier 50 through the differential amplifier Q1.
혼합기(70)에서는 상기 재생증폭기(50)로부터 증폭된 신호와 휘도신호를 혼합하여 PAL복합영상신호가 출력된다.In the mixer 70, a PAL composite image signal is output by mixing the signal amplified by the reproduction amplifier 50 and the luminance signal.
이상으로 상술한 바와같이, 본 고안에 의한 의사 SECAM신호 재생시 콤손실방지회로는 PAL/SECAM판별회로로부터 출력되는 판별신호에 따라 의사 SECAM신호는 콤필터를 통과하지 않도록 절환 제어함으로써 콤필터에 의한 신호손실을 방지하므로 정상적인 화질로 재생할 수 있는 효과가 있다.As described above, when the pseudo SECAM signal is reproduced according to the present invention, the comb loss prevention circuit is controlled by the comb filter by switching the pseudo SECAM signal not to pass through the comb filter according to the discrimination signal output from the PAL / SECAM discrimination circuit. Since it prevents signal loss, it can play with normal picture quality.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910013214U KR940004394Y1 (en) | 1991-08-20 | 1991-08-20 | Comb filter loss protection apparatus when pseudo secam signal is reproduced |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019910013214U KR940004394Y1 (en) | 1991-08-20 | 1991-08-20 | Comb filter loss protection apparatus when pseudo secam signal is reproduced |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR930005882U KR930005882U (en) | 1993-03-22 |
| KR940004394Y1 true KR940004394Y1 (en) | 1994-06-25 |
Family
ID=19318071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019910013214U KR940004394Y1 (en) | 1991-08-20 | 1991-08-20 | Comb filter loss protection apparatus when pseudo secam signal is reproduced |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR940004394Y1 (en) |
-
1991
- 1991-08-20 KR KR2019910013214U patent/KR940004394Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR930005882U (en) | 1993-03-22 |
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