KR930005151Y1 - Recording/reproducing circuit for vcr - Google Patents
Recording/reproducing circuit for vcr Download PDFInfo
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- KR930005151Y1 KR930005151Y1 KR2019870021277U KR870021277U KR930005151Y1 KR 930005151 Y1 KR930005151 Y1 KR 930005151Y1 KR 2019870021277 U KR2019870021277 U KR 2019870021277U KR 870021277 U KR870021277 U KR 870021277U KR 930005151 Y1 KR930005151 Y1 KR 930005151Y1
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- recording
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- color
- reproduction
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
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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
- H04N9/7908—Suppression of interfering signals at the reproducing side, e.g. noise
Abstract
내용 없음.No content.
Description
제1도는 종래의 비디오카세트 레코더의 녹음 재생회로도.1 is a recording and reproducing circuit of a conventional video cassette recorder.
제2도는 본 고안에 따른 비디오카세트 레코더의 녹음 재생회로도.2 is a recording and reproducing circuit diagram of a video cassette recorder according to the present invention.
제3도는 제2도에 따른 노이즈 제거부의 상세회로도.3 is a detailed circuit diagram of a noise removing unit according to FIG. 2.
*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
21 : 기록/재생헤드 22, 34 : 로우패스 필터21: recording / playback head 22, 34: low pass filter
23 : 주재생 컨버터 24 : 튜너23: main playback converter 24: tuner
25 : 밴드패스 필터 26 : 칼라자동조절장치25: band pass filter 26: color automatic adjustment device
27 : 디엠퍼시스 28 : 색신호 분리필터27 de-emphasis 28: color signal separation filter
29, 51 : 버퍼앰프 30, 35 : 믹서29, 51: buffer amplifier 30, 35: mixer
31 : 티브이 모니터 32 : 버스트 엠퍼시스31: TV Monitor 32: Burst Emphasis
33 : 주기록 컨버터 50 : 노이즈 제거부33: main recording converter 50: noise removing unit
52 : 회도신호 트랩부 SW3-SW6: 스위치52: turn signal trap part SW 3 -SW 6 : switch
본 고안은 비디오카세트 레코더에 관한 것으로, 특히 칼라신호/잡음(S/N : Signal/Noise)비율이 떨어진 신호를 휘도/칼라(Y/C)에서 녹음 재생시키는 경우 칼라의 노이즈 성분으로 인해 스트리킹노이즈(Streaking Noise)가 발생되는 것을 방지하도록 한 칼라노이즈 제거회로를 갖는 비디오카세트 레코더의 녹음재생회로에 관한 것이다.The present invention relates to a video cassette recorder, in particular, streaking noise due to the noise component of color when recording and reproducing a signal having a low color signal / noise (S / N) ratio at luminance / color (Y / C) A recording and reproducing circuit of a video cassette recorder having a color noise removing circuit for preventing generation of (Streaking Noise).
종래의 비디오카세트 레코더는 입력된 영상신호의 S/N이 좋지않을 경우 이에 대한 보상회로가 없으므로 재생, 녹화시에 스트리킹 노이즈를 제거하지 못해 거친 화면을 시청하는 단점이 있었다.In the conventional video cassette recorder, when the S / N of the input video signal is not good, there is no compensating circuit for this, and thus there is a disadvantage in that a rough screen cannot be watched because the streaking noise cannot be removed during playback and recording.
제1도는 종래의 비디오카세트 레코더의 녹음재생 회로도로서, 이에 도시된 바와 같이 기록/재생헤드(1)에서 재생되는 신호가 휘도신호(18)로 출력됨과 아울러 로우패스 필터(2) 및 주재생 컨버터(3)을 통해 스위치(SW1)의 재생선택단자(P1)에 인가되게 접속되고, 튜너(4)의 출력신호가 그 스위치(SW1)가 밴드패스필터(5) 및 칼라자동조절장치(6)을 통해 스위치(SW2)에 접속되며, 그 스위치(SW2)의 기록선택단자(R1)는 버스트 엠퍼시스(12), 주기록 컨버터(13), 로우패스필터(14) 및 기록휘도신호(17)가 입력되는 믹서(15)를 통해 상기 기록/재생헤드(1)에 접속되며, 상기 스위치(SW2)의 재생선택단자(P2)는 디엠퍼시스(7), 색신호분리필터(8), 버퍼(10) 및 재생휘도신호(16)가 입력되는 믹서(10)를 통해 티브이 모니터(11)에 접속되어 구성된 것으로, 상기 스위치(SW1)(SW2)는 서로 연동되는 스위치로서 재생모드시에는 재생선택단자(P1), (P2)에 단락되고, 기록모드시에는 기록 선택단자(R1), (R2)에 단락되게 되어있다.FIG. 1 is a circuit diagram for recording and reproducing a conventional video cassette recorder. As shown therein, a signal reproduced by the recording / reproducing head 1 is outputted as a luminance signal 18, and a low pass filter 2 and a main reproduction converter. (3) it is connected to be applied to the playback selection terminal of the switch (SW 1) (P 1) through a tuner (4) the output signal that the switch (SW 1), a band-pass filter 5 and the collar automatically adjust the device's 6 is connected to a switch (SW 2) via a selected record of the switch (SW 2) terminal (R 1) has a burst emphasis 12, and main recording converter 13, low pass filter 14 and The recording / reproduction head 1 is connected to the recording / reproducing head 1 through a mixer 15 to which a recording luminance signal 17 is input, and the reproduction selecting terminal P 2 of the switch SW 2 is deemphasis 7 and color signal separation. filter 8, to be configured is connected to the buffer 10 and the reproduction luminance signal TV monitor 11 through the mixer 10 in which 16 is input, the switch (SW 1) (SW 2 Are connected to each other, and are short-circuited to the playback selection terminals P 1 and P 2 in the playback mode, and short-circuited to the recording selection terminals R 1 and R 2 in the recording mode.
따라서, 재생모드시에 스위치(SW1), (SW2)가 그의 재생선택단자(P1), (P2)에 단락되고, 이때 기록/재생헤드(1)에서 재생되는 신호는 로우패스필터(2), 주재생컨버터(3), 스위치(SW1), 3.58MHz의 밴드패스 필터(5), 칼라자동조절장치(6), 스위치(SW2), 디엠퍼시스(7), 색신호 분리필터(8) 및 버퍼(9)를 순차로 통한후 재생휘도신호(16)와 믹서(10)에서 합성되어 티브이 모니터(11)로 표시된다.Therefore, in the regeneration mode, the switches SW 1 and SW 2 are short-circuited to their regeneration selection terminals P 1 and P 2 , and at this time, the signal reproduced by the recording / reproducing head 1 is a low pass filter. (2), main regeneration converter (3), switch (SW 1 ), band pass filter (5) of 3.58 MHz, color automatic control device (6), switch (SW 2 ), de-emphasis (7), color signal separation filter (8) and the buffer (9) in sequence and then synthesized by the reproduction luminance signal 16 and the mixer 10 is displayed on the TV monitor (11).
한편, 기록모드시에는 스위치(SW1)(SW2)가 그의 기록선택단자(R1)(R2)에 단락되고, 이에 따라 튜너(4)에서 출력되는 영상신호중 칼라신호는 3.58MHz의 밴드패스필터(5)에서 추출된 후 칼라자동조절장치(6), 스위치(SW2) 및 버스 엠퍼시스(12), 주기록 컨버터(13) 및 로우패스필터(14)를 순차로 통해 믹서(15)에서 기록휘도신호 (17)와 합성되어 기록/재생헤드(1)에 기록신호로 인가된다.On the other hand, in the recording mode, the switch SW 1 (SW 2 ) is short-circuited to its recording selection terminals R 1 (R 2 ), whereby the color signal of the video signals output from the tuner 4 has a band of 3.58 MHz. After being extracted from the pass filter 5, the color controller 15, the switch SW 2 and the bus emulation 12, the main recording converter 13 and the low pass filter 14 are sequentially passed through the mixer 15. Is combined with the recording luminance signal 17 and applied to the recording / reproducing head 1 as a recording signal.
따라서, 튜너(4)의 영상신호 기록시에 칼라 S/N이 저하되나, 녹음재생시 나타나는 스트리킹 노이즈를 제거할 수 없는 회로가 없으므로 저질의 화면을 시청하게 된다. 즉 튜너(4)의 복합영상신호가 휘도/칼라(Y/N)로 입력되면, 그 영상신호는 스위치(SW1)를 통해 밴드패스 필터(5)에 입력되어 칼라신호만이 추출되고, 이 칼라신호는 칼라자동조절장치(6)로 입력된후 그 칼라자동조절장치(6)에서 칼라신호 레벨의 변동에 관계없이 일정하게 되어 버스트 엠파시스(12)에 입력된다. 따라서 버스트신호가 업(UP)된 칼라신호는 주기록 컨버터(13)에 입력되어 칼라기록신호가 저역변환되고, 이 저역변환된 신호는 로우패스 필터(14)를 통해 믹서(15)에 입력되어 기록 휘도신호(17)와 합성된후 기록/재생헤드(1)에 인가되어 테이프에 기록된다. 이에 따라 스트리킹 노이즈를 제거할 수 있는 문제점이 있었다.Therefore, while the color S / N is degraded when the tuner 4 records the video signal, there is no circuit that cannot remove the streaking noise that appears during recording and playback, so that a poor quality screen can be viewed. That is, when the composite video signal of the tuner 4 is input in luminance / color (Y / N), the video signal is input to the band pass filter 5 through the switch SW 1 to extract only the color signal. The color signal is input to the color automatic control device 6 and then becomes constant at the color automatic control device 6 and is input to the burst emphasis 12 regardless of the change in the color signal level. Therefore, the color signal with the burst signal UP is input to the main recording converter 13 so that the color recording signal is low-converted, and the low-converted signal is input to the mixer 15 through the low pass filter 14. After combining with the recording luminance signal 17, it is applied to the recording / reproducing head 1 and recorded on the tape. Accordingly, there was a problem that can remove streaking noise.
본 고안은 이와 같은 종래의 문제점을 감안하여, 재생시에만 사용하는 색신호 분리필터(Comb Filter)를 녹화시에도 사용하고, 또한 버퍼 앰프와 휘도신호 트랩회로를 사용하여 튜너 영상신호의 신호/잡음(S/N)비가 조금 떨어지더라도 칼라 노이즈를 제거하여 녹화함으로써 칼라 S/N 및 스트리킹 노이즈를 개선시키도록 안출한 것으로, 이를 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다.In consideration of such a conventional problem, the present invention uses a color signal separation filter (Comb Filter), which is used only during playback, and also uses a buffer amplifier and a luminance signal trap circuit to signal / noise the tuner video signal (S). Even if the / N) ratio slightly drops, the color S / N and streaking noise are improved by recording by removing the color noise, which will be described in detail with reference to the accompanying drawings.
제2도는 본 고안의 비디오카세트 레코더 녹음 재생회로도로서, 이에 도시한 바와 같이 기록/재생헤드(21)에서 재생되는 신호가 로우패스필터(22) 및 주재생 컨버터(23)를 통해 스위치(SW4)의 재생 선택단자(P4)에 인가되게 접속하고, 튜너(24)의 출력신호가 그 스위치(SW4)의 기록선택단자(R4)에 인가되게 접속되어, 그 스위치(SW4)거밴스패스필터(25) 및 칼라자동조정장치(6)를 통해 스위치(SW5)에 접속되며, 그 스위치(SW5)의 기록선택단자(R5)는 버스트 엠퍼시스(32) 주기록컨버터 (33), 로우패스필터(34) 및 기록휘도신호(36)가 입력되는 믹서(35)로 구성된 기록부(60)를 통해 상기 기록/재생헤드(21)에 접속되고, 그 스위치(SW5)의 재생선택단자 (P5)는 디엠퍼시스(27), 색신호분리필터(28), 버퍼앰프(29) 및 재생휘도신호(37)가 입력되는 믹서(30)를 통해 티브이 모니터(31)에 접속되어 구성된 비디오카세트 레코더의 녹음재생회로에 있어서, 상기 튜너(24)의 출력측을 버퍼앰프(51) 및 휘도신호 트랩부(52)로 구성되어 색신호중의 노이즈성분인 휘도신호를 제거하는 노이즈 제거부(50)를 통해 스위치(SW8)의 기록선택단자(R6)에 접속함과 아울러 상기 디엠피시스(27)의 출력단자를 그 스위치(SW6)의 재생선택단자(P8)에 접속하여, 그 스위치(SW8)를 상기 색신호 분리필터(28)의 입력단자에 접속하고, 상기 버퍼앰프(29)의 출력단자를 스위치(SW3)에 접속한후 그의 재생선택단자(P3)를 상기 믹서(30)의 입력단자에 접속하고, 기록선택단자(R3)를 상기 스위치(SW4)의 기록선택단자(R4)에 접속하여 구성한 것으로, 상기 스위치(SW3-SW8)는 재생모드시에 그의 재생선택단자(P3-P6)에 각기 단락되고 기록모드시에 그의 기록선택단자(R3-R6)에 각기 단락되게 되어 있다.2 is a video cassette recorder recording and reproducing circuit diagram of the present invention, in which a signal reproduced by the recording / reproducing head 21 is switched through the low pass filter 22 and the main reproducing converter 23 (SW 4). ) it is to be connected to the reproduction selection terminal (P 4) of, and the output signal of the tuner 24 are connected to be applied to the write select terminal (R 4) of the switch (SW 4), the switch (SW 4) I The switch SW 5 is connected to the switch SW 5 via the vance pass filter 25 and the color automatic adjustment device 6, and the recording selector terminal R 5 of the switch SW 5 is connected to the burst emulation 32 main recording converter ( 33), is connected to the low-pass filter 34 and a recording luminance signal (the mixer 35, the recording / reproducing head 21 through the recording unit 60 made up to 36) is input, of the switch (SW 5) The reproduction selection terminal P 5 is provided through the mixer 30 to which the de-emphasis 27, the color signal separation filter 28, the buffer amplifier 29, and the reproduction luminance signal 37 are input. In the recording and reproducing circuit of the video cassette recorder connected to the controller 31, the output side of the tuner 24 is constituted by the buffer amplifier 51 and the luminance signal trap unit 52, and the luminance signal which is a noise component of the color signal. Is connected to the recording select terminal R 6 of the switch SW 8 through the noise removing unit 50 to remove the signal, and the output selector of the dempsis 27 is connected to the reproduction select terminal of the switch SW 6 . P 8 ), the switch SW 8 is connected to the input terminal of the color signal separation filter 28, and the output terminal of the buffer amplifier 29 is connected to the switch SW 3 , and then the reproduction selection thereof is performed. to be connected to the terminal (P 3) to an input terminal of the mixer 30, and is configured by connecting a recording selection terminal (R 3) in the record selection terminal (R 4) of the switch (SW 4), the switch (SW 3 -SW 8) are respectively short-circuited in his play selection terminal (P 3 -P 6) for the playback mode, the recording of his choice at the time of the recording mode, Here it is presented respectively in paragraphs (R 3 -R 6).
제3도는 제2도 노이즈 제거부(50)의 상세회로도로서 이에 도시한 바와 같이 버퍼앰프(51)는 콘덴서(C11, C12), 저항(R11-R16) 및 트랜지스터(Q11)로 구성하고, 휘도신호 트랩부(52)는 저항(R17), 코일(L11) 및 콘덴서(C13)로 구성한 것으로, 이와 같이 구성한 본 고안의 작용효과를 상세히 설명하면 다음과 같다.3 is a detailed circuit diagram of the second noise removing unit 50. As shown in FIG. 3, the buffer amplifier 51 includes the capacitors C 11 and C 12 , the resistors R 11- R 16 , and the transistors Q 11 . The luminance signal trap unit 52 is composed of a resistor (R 17 ), a coil (L 11 ) and a capacitor (C 13 ), the operation and effect of the present invention configured as described above will be described in detail as follows.
재생모드이면 스위치(SW3-SW6)가 그의 재생선택단자(R3-R6)에 각기 단락되고, 따라서 이때 기록/재생헤드(21)에서 재생되는 신호는 로우패스필터(22), 주재생 컨버터(23), 스위치(SW4), 3.58MHz의 밴드패스필터(25), 칼라자동조절장치(26), 스위치(SW5) 디엠퍼시스(27), 스위치(SW6), 디엠퍼시스(27), 스위치(SW6) 색신호 분리필터(28) 및 버퍼앰프(29)를 순차로 통해 믹서(30)에 인가되어, 재생휘도신호(37)와 합성된후 티브이 모니터(31)에 인가되어 표시된다.If the playback mode switch (SW 3 -SW 6) whose playback selection terminal is short-circuited to each (R 3 -R 6), Therefore, this time the signal is low-pass filter 22 to be reproduced in the recording / reproducing head 21, a main Regenerative converter 23, switch SW 4 , band pass filter 25 of 3.58 MHz, color automatic adjustment device 26, switch SW 5 de-emphasis 27, switch SW 6 , de-emphasis ( 27), the switch SW 6 color signal separation filter 28 and the buffer amplifier 29 are sequentially applied to the mixer 30, synthesized with the reproduction luminance signal 37 and then applied to the TV monitor 31. Is displayed.
한편, 기록모드이면 스위치(SW3-SW6)가 그의 기록선택단자(R3-R6)에 각기 단락되고, 이에 따라 튜너(4)의 출력신호가 버퍼앰프(15) 및 휘도신호 트랩부(52)를 통과하면서 1차적인 칼라성분신호만 추출된후 스위치(SW6) 및 색신호 분리필터(28)를 통과하면서 칼라노이즈 성분이 제거되고, 이 색신호 분리필터(28)의 출력신호는 버퍼앰프(29) 및 스위치(SW3, SW4)를 통한후 밴드패스필터(25)에서 순수한 칼라 성분신호만이 추출되고, 이 칼라성분신호는 칼라자동조정장치(26), 스위치(SW5) 및 기록부(60)를 통해 기록/재생헤드(21)에 인가되어 테이프에 기록되며, 이에 따라 스트리킹 노이즈성분이 없는 상태로 기록되어진다.On the other hand, the recording mode, the switch (SW 3 -SW 6) is short-circuited to each record his selection terminal (R 3 -R 6), thus the output signal of the tuner 4, the buffer amplifier 15 and the luminance signal trap portion After passing through the 52, only the primary color component signal is extracted, and then the color noise component is removed while passing through the switch SW 6 and the color signal separation filter 28, and the output signal of the color signal separation filter 28 is buffered. After the amplifier 29 and the switches SW 3 and SW 4 , only the pure color component signal is extracted from the band pass filter 25, and the color component signal is automatically adjusted by the color adjusting device 26 and the switch SW 5 . And applied to the recording / reproducing head 21 via the recording unit 60 and recorded on the tape, thereby recording in the absence of streaking noise components.
이를 보다 상세히 설명하면, 튜너(24)에서 수신한 영상신호는 휘도/칼라 신호로 분리되어 출력되고, 이때 칼라신호는 버퍼앰프(51)의 트랜지스터(Q11)를 통해 증폭된후 휘도신호 트랩부(52)의 저항(R17), 코일(L11) 및 콘덴서(C3)에 의한 공진주파수에 의해 휘도신호가 트랩되어 휘도신호 노이즈 성분이 제거된다.In more detail, the image signal received by the tuner 24 is separated into a luminance / color signal and outputted. In this case, the color signal is amplified through the transistor Q 11 of the buffer amplifier 51 and then the luminance signal trap unit. The luminance signal is trapped by the resonant frequencies of the resistor R 17 , the coil L 11 , and the capacitor C 3 at 52 to remove the luminance signal noise component.
콘덴서(C3)에 의한 공진주파수에 의해 휘도 신호가 트랩되어 휘도신호 노이즈 성분이 제거된다.The luminance signal is trapped by the resonance frequency of the capacitor C3 to remove the luminance signal noise component.
이와 같이 1차로 휘도신호 노이즈 성분이 제거된 칼라신호는 스위치(SW6)를 통한 후 색신호 분리필터(28)를 통한 후 색신호 분리필터(28)를 통해 순수한 칼라신호로 되고, 이 칼라신호는 버퍼앰프(29), 스위치(SW3, SW4), 3.58MHz의 밴드패스필터(25), 칼라자동조절장치(26) 및 스위치(SW5)를 통해 기록부(60)에 입력되고, 이 입력신호는 버스트 엠퍼시스(32)를 통한후 주기록컨버터(33)에서 저역변환되고, 다시 로우패스필터(34)를 통해 믹서(35)에 입력되어 기록휘도신호(36)와 합성된후 기록/재생헤드(21)에 인가되어 테이프에 기록되며, 결국 이때 테이프에 기록되는 신호에는 스트리킹 노이즈신호가 없고, 칼라신호/잡음(S/N)비가 개선된 신호로 된다.In this way, the color signal from which the luminance signal noise components are first removed is a pure color signal through the color signal separation filter 28 after the color signal separation filter 28 through the switch SW 6 , and the color signal is buffered. The input signal is input to the recording unit 60 through the amplifier 29, the switches SW 3 and SW 4 , the band pass filter 25 of 3.58 MHz, the color automatic control device 26 and the switch SW 5 . After the burst emulation (32) is converted to the low-frequency conversion in the main recording converter 33, input to the mixer 35 through the low pass filter 34 is synthesized with the recording luminance signal 36, recording / playback The signal is applied to the head 21 and recorded on the tape. At this time, the signal recorded on the tape has no streaking noise signal, and the color signal / noise (S / N) ratio is improved.
이상에서 상세히 설명한 바와 같이 본 고안은 재생시에만 사용하는 색신호 분리필터를 녹화시에도 사용하고, 특히 버퍼앰프 및 휘도신호 트랩부를 사용하여 휘도신호 노이즈성분을 1차로 제거하게 되므로 영상신호의 신호/잡음비가 조금 떨어져도 칼라노이즈를 제거하여 녹화할 수 있고, 칼라신호/잡음비를 개선하고 스트리킹 노이즈를 제거할 수 있는 효과가 있게 된다.As described in detail above, the present invention uses a color signal separation filter, which is used only for playback, in recording, and in particular, a luminance signal noise component is firstly removed by using a buffer amplifier and a luminance signal trap so that the signal / noise ratio of an image signal is increased. Even if it is a little apart, it can record by removing color noise, improving color signal / noise ratio and removing streaking noise.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870021277U KR930005151Y1 (en) | 1987-11-30 | 1987-11-30 | Recording/reproducing circuit for vcr |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870021277U KR930005151Y1 (en) | 1987-11-30 | 1987-11-30 | Recording/reproducing circuit for vcr |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR890011603U KR890011603U (en) | 1989-07-13 |
| KR930005151Y1 true KR930005151Y1 (en) | 1993-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019870021277U KR930005151Y1 (en) | 1987-11-30 | 1987-11-30 | Recording/reproducing circuit for vcr |
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| Country | Link |
|---|---|
| KR (1) | KR930005151Y1 (en) |
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1987
- 1987-11-30 KR KR2019870021277U patent/KR930005151Y1/en not_active IP Right Cessation
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| KR890011603U (en) | 1989-07-13 |
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