KR900001498Y1 - Vcr's playing control circuit - Google Patents

Vcr's playing control circuit Download PDF

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KR900001498Y1
KR900001498Y1 KR2019860019648U KR860019648U KR900001498Y1 KR 900001498 Y1 KR900001498 Y1 KR 900001498Y1 KR 2019860019648 U KR2019860019648 U KR 2019860019648U KR 860019648 U KR860019648 U KR 860019648U KR 900001498 Y1 KR900001498 Y1 KR 900001498Y1
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signal
video
output
com
control circuit
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KR2019860019648U
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Korean (ko)
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KR880013404U (en
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이승호
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주식회사금성사
구자학
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/026—Control of operating function, e.g. switching from recording to reproducing by using processor, e.g. microcomputer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/20—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

내용 없음.No content.

Description

자기기록 재생장치의 재생제어회로Playback control circuit of magnetic recording playback device

첨부된 도면은 본 고안의 재생 제어회로도이다.The accompanying drawings are a reproduction control circuit diagram of the present invention.

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

1 : 증폭기 2 : 복조기1: amplifier 2: demodulator

3 : 동기분리기 4,5 : 피크검출기3: synchronous separator 4,5: peak detector

6,7 : 재생신호 판별기 8 : 마이콤6,7: Playback signal discriminator 8: Micom

AND1: 앤드게이트AND 1 : ANDGATE

본 고안은 비디오 테이프에 영상신호를 기록 및 재생하는 자기기록 재생장치에 있어서, 비디오 테이프에 영상신호가 기록되어 있지 않을 경우에 재생이 되지 않게한 자기기록 재생장치의 재생제어회로에 관한 것이다.The present invention relates to a reproducing control circuit of a magnetic recording and reproducing apparatus in which a magnetic recording and reproducing apparatus for recording and reproducing a video signal on a video tape is not reproduced when no video signal is recorded on the video tape.

종래의 자기기록 재생장치는 사용자가 재생버튼을 누르면, 비디오 테이프의 영상신호 기록유무에 관계없이 재생하였으므로 비디오 테이프에 영상신호가 기록되어 있지 않을 경우에는 화면에 잡음신호만 나타나 사용자에게 불쾌감을 주는 결함이 있었다.In the conventional magnetic recording and playback apparatus, when the user presses the play button, the video is reproduced regardless of whether the video tape is recorded or not. Therefore, when no video signal is recorded on the video tape, only a noise signal is displayed on the screen. There was this.

본 고안은 이와 같은 종래의 결함을 감안하여, 사용자가 재생버튼을 눌러도 비디오 테이프에 영상신호가 기록되어 있지 않을 경우에는 재생되지 않게 하여 화면에 잡음신호만 나타나게 되는 것을 방지하게 안출한 것으로, 이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.The present invention has been made in view of the above-mentioned deficiency, so that when the user presses the play button, the video signal is not reproduced if no video signal is recorded on the video tape, thereby preventing only the noise signal from appearing on the screen. When described in detail with reference to the drawings as follows.

첨부된 도면에 도시한 바와 같이 영상헤드(CH)가 영상신호를 증폭기(1)로 증폭하고, 복조기(2)로 복조하는 자기기록 재생장치에 있어서, 상기 복조기(2)의 출력신호에서 동기 신호를 분리하는 동기분리기(3)와, 상기 증폭기(1) 및 동기 분리기(3)의 출력신호의 피크(PECK)를 각기 검출하는 연산증폭기(OP1),(OP2) 및 다이오드[D1),(D2) 콘덴서(C1),(C2) 전계효과 트랜지스터(FET1),(FET2), 저항(R1),(R2)로된 피크검출기(4)(5)와, 상기 피크검출기(4)(5)의 출력전압과 설정된 기준전압을 비교하여 재생신호의 유,무를 판별하는 비교기(COM1),(COM2) 및 저항(R3,R4),(R5,R6)으로 된 재생신호 판별기(6)(7)와, 상기 재생신호 판별기(6)(7)의 출력신호를 앤드화하여 마이콤(8)의 제어단자(CS)에 인가되는 앤드게이트(AND1)로 구성한 것으로, 상기에서 마이콤(8)은 제어단자(CS)에 저전위신호가 입력되면 재생을 정지시킴과 아울러 오디오 및 영상 뮤팅신호를 출력하게 하고, 도면의 설명중 미설명 부호 Vcc, VDD, -VSS는 전원단자이다.In the magnetic recording and reproducing apparatus in which the image head CH amplifies the image signal with the amplifier 1 and demodulates it with the demodulator 2, as shown in the accompanying drawings, the synchronization signal is output from the output signal of the demodulator 2. A synchronous separator (3) for separating the signal, and an operational amplifier (OP 1 ), (OP 2 ) and a diode (D 1 ) for respectively detecting peaks (PECK) of the output signal of the amplifier (1) and the synchronous separator (3). (D 2 ) peak detectors (4) (5) consisting of capacitors (C 1 ), (C 2 ) field effect transistors (FET 1 ), (FET 2 ), resistors (R 1 ), (R 2 ), Comparators (COM 1 ), (COM 2 ), and resistors (R 3 , R 4 ), (R 5 ) for comparing the output voltages of the peak detectors (4) (5) and the set reference voltage to determine the presence or absence of a reproduction signal. AND applied to the control terminal CS of the microcomputer 8 by oxidizing the output signal of the reproduction signal discriminator 6, 7 and R 6 ) and the output signal of the reproduction signal discriminator 6, 7. It is configured as a gate (AND 1), the microcomputer (8) is in the control terminal (CS) When a low potential signal is input to the device, playback is stopped and an audio and video muting signal is output. In the description of the drawings, reference numerals V cc , V DD , and -V SS are power terminals.

이와 같이 구성된 본 고안의 작용효과를 상세히 설명하면, 다음과 같다.Referring to the effects of the present invention configured in this way in detail, as follows.

전원단자(VCC), (VDD), (-VSS)에 전원이 인가되고, 사용자가 재생버튼을 눌러 재생시키면, 영상헤드(CH)는 비디오 테이프에 기록된 신호를 재생하고, 재생된 신호는 증폭기(1)에서 증폭되고, 복조기(2)에서 복조된 후 동기 분리기(3)에서 동기 신호가 분리된다.When power is applied to the power supply terminals (V CC ), (V DD ), and (-V SS ), and the user presses the play button to play, the video head (CH) plays back the signal recorded on the video tape. The signal is amplified in the amplifier 1, demodulated in the demodulator 2 and then the synchronous signal is separated in the synchronous separator 3.

이때, 비디오 테이프에 영상신호가 기록되어 있어 영상헤드(CH)가 영상신호를 재생하면, 증폭기(1)에서 영상신호가 출력되어 피크검출기(5)에 입력되므로 피크검출기(5)는 고전위신호를 출력하여 재생신호판별기(7)의 비교기(COM2)의 비반전입력단자(+)에 인가되고, 또한 동기 분리기(3)도 동기신호를 분리하여 피크검출기(4)에 입력되므로 피크검출기(4)도 고전위신호를 출력하여 재생신호(6)의 비교기(COM1)의 비반전 입력단자(+)에 인가된다.At this time, when the video signal is recorded on the video tape and the video head CH reproduces the video signal, the video signal is output from the amplifier 1 and input to the peak detector 5 so that the peak detector 5 has a high potential signal. Is output to the non-inverting input terminal (+) of the comparator (COM 2 ) of the reproduction signal discriminator (7), and the synchronous separator (3) separates the synchronous signal and is input to the peak detector (4). (4) also outputs a high potential signal and is applied to the non-inverting input terminal (+) of the comparator COM 1 of the reproduction signal 6.

여기서, 비디오 테이프에 영상신호가 기록되어 있을 경우에 비교기(COM1),(COM2)의 비반전입력단자(+)(+)에 인가되어 고전위신호가 전원단자(VCC)의 전원을 저항(R3,R4), (R5,R6)으로 각기 분할하여 비교기(COM1),(COM2)의 반전입력단자(-)(-)에 인가되는 기준전압보다 높게 저항(R3,R4), (R5,R6)의 값을 설정하면, 비교기(COM1),(COM2)의 출력단자에는 고전위신호가 출력되어 앤드게이트(AND1)에 입력되므로 앤드게이트(AND1)의 출력단자에는 고전위신호가 출력되어 마이콤(8)의 제어단자(CS)에 인가되고, 이에 따라 마이콤(8)은 영상헤드(CH)가 비디오 테이프에 기록되어 있는 영상신호를 계속 재생하게 된다.Here, when a video signal is recorded on the video tape, the high potential signal is applied to the non-inverting input terminal (+) (+) of the comparators (COM 1 ) and (COM 2 ) to supply power to the power supply terminal (V CC ). The resistors R are divided into resistors R 3 , R 4 , and R 5 , R 6 , respectively, and are higher than the reference voltage applied to the inverting input terminals (-) (-) of the comparators COM 1 and COM 2 . When the values of 3 , R 4 ) and (R 5 , R 6 ) are set, high-potential signals are output to the output terminals of the comparators (COM 1 ) and (COM 2 ) and input to the AND gate (AND 1 ). A high potential signal is output to the output terminal of AND 1 and is applied to the control terminal CS of the microcomputer 8. As a result, the microcomputer 8 outputs a video signal in which the video head CH is recorded on the video tape. Will continue to play.

그리고, 상기에서 비디오 테이프에 영상신호가 기록되어 있지 않을 경우에는 영상헤드(CH)가 재생하는 신호가 없어 증폭기(1) 및 동기분리기(3)가 저전위신호를 출력하게 되므로 피크검출기(4)(5)도 저전위신호를 출력하여 비교기(COM1)(COM2)의 비반전입력단자(+)(+)에 인가되고, 이에 따라 비교기(COM1),(COM2)의 반전입력단자(-)(-)에 인가되는 기준전압이 그의 비반전입력단자(+)(+)에 인가되는 전압보다 높게 되므로 비교기(COM1),(COM2)의 출력단자에는 모두 저전위신호를 출력하고, 앤드게이트(AND1)도 저전위신호를 출력하여 마이콤(8)의 제어단자(CS)에 인가된다.In the case where the video signal is not recorded on the video tape, the peak detector 4 does not have a signal reproduced by the video head CH, and the amplifier 1 and the synchronous separator 3 output a low potential signal. 5 is also applied to the non-inverting input terminals (+) (+) of the comparator (COM 1) (COM 2) outputs a low potential signal, so that the inverting input terminal of the comparator (COM 1), (COM 2) Since the reference voltage applied to (-) (-) becomes higher than the voltage applied to its non-inverting input terminal (+) (+), a low potential signal is output to both output terminals of the comparators COM 1 and COM 2 . The AND gate AND 1 also outputs a low potential signal and is applied to the control terminal CS of the microcomputer 8.

따라서, 마이콤(8)은 정지신호를 출력하여 비디오 테이프의 재생을 정지시킴과 아울러 오디오 및 영상뮤팅신호를 출력하여 뮤팅시키게 된다.Therefore, the microcomputer 8 outputs a stop signal to stop playback of the video tape, and outputs and mutes audio and video muting signals.

이상에서 설명한 바와 같이 본 고안은 비디오 테이프에 영상신호가 기록되어 있지 않을 경우에는 재생버튼을 눌러도 재생되지 않게 하여 화면으로 잡음신호만 출력되는 것을 방지하는 효과가 있다.As described above, when the video signal is not recorded on the videotape, the present invention does not play even when the play button is pressed, thereby preventing only the noise signal from being output to the screen.

Claims (1)

영상헤드(CH)가 재생한 영상신호를 증폭기(1)로 증폭하고, 복조기(2)로 복조하게 한 자기기록 재생장치에 있어서 상기 복조기(2)의 출력신호에서 동기 신호를 분리하는 동기 분리기(3)와, 상기 증폭기(1) 및 동기 분리기(3)의 출력신호의 피크를 검출하는 피크검출기(4)(5)와, 상기 피크검출기(4)(5)의 출력전압과 설정된 기준전압을 비교하여 재생신호의 유무를 판별하는 재생신호판별기(6)(7)와, 상기 재생신호판별기(6)(7)의 출력신호를 앤드화하여 마이콤(8)에 입력시키는 앤드게이트(AND1)로 구성하여 비디오 테이프에 영상신호가 기록되어 있지 않을 경우에 재생되지 않게함을 특징으로 하는 자기기록 재생장치의 재생제어회로.In the magnetic recording and reproducing apparatus in which the video signal reproduced by the video head CH is amplified by the amplifier 1 and demodulated by the demodulator 2, a synchronous separator for separating the synchronous signal from the output signal of the demodulator 2 ( 3) the peak detectors 4 and 5 for detecting peaks of the output signals of the amplifier 1 and the synchronous separator 3, and the output voltages of the peak detectors 4 and 5 and the set reference voltages. An AND signal for inputting the output signal of the reproduction signal discriminator 6 and 7 and the output signal of the reproduction signal discriminator 6 and 7 to compare the input signal to the microcomputer 8 in comparison with each other. 1 ) A reproduction control circuit of a magnetic recording and reproducing apparatus, characterized in that it is not reproduced when a video signal is not recorded on a video tape.
KR2019860019648U 1986-12-09 1986-12-09 Vcr's playing control circuit KR900001498Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019860019648U KR900001498Y1 (en) 1986-12-09 1986-12-09 Vcr's playing control circuit

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Application Number Priority Date Filing Date Title
KR2019860019648U KR900001498Y1 (en) 1986-12-09 1986-12-09 Vcr's playing control circuit

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KR880013404U KR880013404U (en) 1988-08-30
KR900001498Y1 true KR900001498Y1 (en) 1990-02-28

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KR2019860019648U KR900001498Y1 (en) 1986-12-09 1986-12-09 Vcr's playing control circuit

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