KR950005247B1 - Recording signal distinction circuit of recording & playing system - Google Patents

Recording signal distinction circuit of recording & playing system Download PDF

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Publication number
KR950005247B1
KR950005247B1 KR1019930001574A KR930001574A KR950005247B1 KR 950005247 B1 KR950005247 B1 KR 950005247B1 KR 1019930001574 A KR1019930001574 A KR 1019930001574A KR 930001574 A KR930001574 A KR 930001574A KR 950005247 B1 KR950005247 B1 KR 950005247B1
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South Korea
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signal
head
mode
reproducing
control
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KR1019930001574A
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Korean (ko)
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KR940020378A (en
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조도현
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주식회사금성사
이헌조
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Priority to US08/703,838 priority patent/US5838875A/en

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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
    • G11B20/02—Analogue recording or reproducing

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

a system control part for receiving a playback command to control the operation of the system and output a control signal to select one of the digital playback mode and analog playback mode; a capstan speeder for controlling the driving of the capstan according to the control signal; a drum speed for controlling the rotation speed of the head drum; a head/pre-amplifier for repeatedly switching the head of the corresponding mode and amplifying a video signal in a predetermined level; a signal verifying part for verifying the presence or not of the signal according to determination of the proper reproducing characteristic of the playback signal detected from the output of the head/pre-amplifier; and a mode selecting part for forming a reproducing loop to the analog playback part if the reproducing characteristic is good, and forming the reproducing loop to the digital playback part if the reproducing characteristic is not good.

Description

기록재생장치의 기록신호 판별회로Recording signal discrimination circuit of recording and reproducing apparatus

첨부한 도면은 본 발명에 따른 기록신호 판별회로의 블럭도.The accompanying drawings are block diagrams of recording signal discrimination circuits according to the present invention;

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

1 : 시스템 제어부 2: 캡스탄 속도계1: system control unit 2: capstan speedometer

3 : 헤드/프리앰프 4 : 드럼 속도계3: head / preamp 4: drum speedometer

5 : 신호 판별부 6 : 모드 선택부5: signal discrimination unit 6: mode selection unit

7 : 아날로그 재생부 8 : 디지탈 재생부7: analog playback section 8: digital playback section

본 발명은 기록재생장치의 기록신호 판별에 관한 것으로 특히 스틸(steel) 상태에서 브이씨알 테이프의 1트랙만을 재생하여 엔티에스씨(NTSC)인 아날로그 신호와 디지탈 신호에 따른 검출신호의 유무를 판별함에 따라 해당 모드의 재생동작을 수행하는 기록재생장치의 기록신호 판별회로에 관한 것이다.The present invention relates to discriminating the recording signal of the recording and reproducing apparatus. In particular, the present invention relates to determining the presence or absence of a detection signal according to an NTSC analog signal and a digital signal by reproducing only one track of a VRC tape in a steel state. Accordingly, the present invention relates to a recording signal discrimination circuit of a recording / playback apparatus for performing a reproducing operation in a corresponding mode.

일반적으로 아날로그 기록방식과 다른 디지탈 기록 포멧을 갖는 기록재생 장치는 디지탈 신호만 기록재생하는 방식이거나 디지탈/아날로그 겸용 기록재생 방식이 있다. 그러나, 이러한 방식이 적용된 일반적인 기록재생장치는 기록포멧을 검출하는 회로가 없어 기록된 신호를 판별하지 못함으로 재생시마다 사용자가 일일이 테이프를 확인하고 재생모드를 선택해야 하는 불편함이 있었다.In general, a recording and reproducing apparatus having a digital recording format different from the analog recording method is a method of recording and reproducing only a digital signal or a digital / analog recording and reproducing method. However, the general recording and reproducing apparatus to which such a method is applied does not have a circuit for detecting a recording format, and thus it is inconvenient for the user to check the tape and select the reproducing mode at every playback.

본 발명은 이러한 종래의 문제점을 해소시키기 위해 비디오테이프를 스틸(steel ) 상태의 아날로그 모드에서 한 트랙의 영상신호를 재생하고 재생신호의 유무를 판별함에 따라 해당 재생모드를 자동으로 선택하는 기록재생장치의 기록신호 판별신호를 창안한 것으로, 이를 첨부한 도면을 참조하여 상세히 설명하면 다음과 같다.The present invention provides a recording and playback apparatus for automatically reproducing a video signal of one track in an analog mode of a steel state and automatically selecting a corresponding playback mode in order to solve such a conventional problem. Invented the recording signal discrimination signal of the present invention, which will be described in detail with reference to the accompanying drawings.

첨부한 도면은 본 발명에 따른 기록신호 판별회로의 블럭도로서 이에 도시한 바와 같이, 시스템의 기록재생 동작을 제어하는 시스템 제어부(1)와, 이 시스템 제어부( 1)의 제어신호(VS1)에 따라 캡스탄(Capstan)의 회전을 제어하는 캡스탄 속도계(2)와, 상기 시스템 제어부(1)의 제어신호(VS2)에 따라 재생헤드를 선택함과 아울러 헤드의 검출신호를 소정레벨 중폭하는 헤드/프리앰프(4)와, 상기 시스템 제어부(1)의 제어신호(VS3)에 따라 헤드드럼의 속도를 제어하는 드럼 속도계(3)와, 상기 헤드/프리앰프 (4)의 출력(V1)을 검출하여 이 재생신호의 특성량이 양호한지 판별함에 따라 신호의 유무를 판별하는 신호판별부(5)와, 이 신호판별부(5)의 출력호(V2)에 따라 재생특성이 양호한 경우 상기 시스템 제어부(1)에서 선택한 아날로그 재생모드를 선택하고 재생특성이 불량한 경우 상기 시스템제어부(1)에서 선택하지 않은 디지탈 재생모드를 선택하는 모드선택부(6)와, 이 모드선택부(6)의 출력(VA1)(VD1)을 각기 재생하는 아날로그 재생부(7), 디지탈 재생부(8)로 구성한다.The accompanying drawings are block diagrams of recording signal discrimination circuits according to the present invention, as shown therein. The system control section 1 controls the recording / reproducing operation of the system, and the control signal VS 1 of the system control section 1 . According to the capstan speedometer 2 for controlling the rotation of the capstan and the control head VS 2 of the system controller 1, and the detection signal of the head The head / preamplifier 4, the drum tachometer 3 for controlling the speed of the head drum in accordance with the control signal VS 3 of the system control unit 1, and the output of the head / preamplifier 4 V 1 ) is detected to determine whether the characteristic amount of the reproduced signal is good, and according to the signal discrimination section 5 for discriminating the presence or absence of a signal, and the output arc V 2 of the signal discrimination section 5, If good, select the analog playback mode selected by the system control unit 1 and play back. If the property bad the system control unit 1 the mode selection unit 6 to select a digital reproduction mode is not selected from, an output of the mode selection section 6 (VA 1) analog to each play back (VD 1) It consists of a regeneration part 7 and a digital regeneration part 8.

상기 캡스탄 속도계(2)는 디지탈 모드시 테이프를 이송시키기 위한 캡스탄(Cap stan)을 아날로그 모드시의 속도(Vt)에 1/2의 속도(1/2Vt)로 회전시키며, 상기 드럼속도계(3)는 아날로그 모드시 헤드드럼을 1800rpm으로 회전시키고 디지탈모드시 3600 rpm으로 회전시킨다.The capstan tachometer 2 rotates the capstan for conveying the tape in the digital mode at a speed of 1 / 2Vt to the speed Vt in the analog mode, and the drum tachometer ( 3) Rotate head drum at 1800rpm in analog mode and 3600rpm in digital mode.

이와같이 구성한 본 발명회로의 작용 및 효과를 상세히 설명하면 다음과 같다.The operation and effects of the circuit of the present invention configured as described above are described in detail.

브이씨알에 비디오테이프가 삽입되어 재생명령(CPB)이 입력되면 시스템제어부 (1)는 캡스탄 속도계(2)에 정지명령인 제어신호(VS1)를 출력하여 테이프의 진행을 정지시킴으로써 스틸(steel) 재생모드가 되게한 후 헤드/프리앰프(4)에 헤드 선택명령인 제어신호(VS2)를 출력하여 아날로그 헤드를 선택하고 드럼속도계(3)에 속도 선택명령인 제어신호(VS3)를 출력하여 헤드드럼의 회전속도를 1800rpm이 되게 한다.When the video tape is inserted in the V-Cal and the play command C PB is input, the system controller 1 outputs a control signal VS 1 , which is a stop command, to the capstan tachometer 2 and stops the tape from moving. steel) After entering the regeneration mode, the control signal VS 2 , which is a head selection command, is output to the head / preamp 4 to select an analog head, and the control signal VS 3 , which is a speed selection command, to the drum tachometer 3 . Output the head drum to 1800rpm.

이때, 시스템제어부(1)의 제어에 따라 헤드/프리앰프(4)의 아날로그 헤드는 비디오테이프의 기록 포맷에서 1트랙의 신호(Vi)를 검출하여 소정레벨 증폭하면 상기 헤드/프리앰프(4)의 출력(V1)을 입력받은 신호판별부(5)는 신호의 유무를 판별하여 판별신호(V2)를 모드선택부(6)에 출력하게 된다.At this time, according to the control of the system controller 1, the analog head of the head / preamplifier 4 detects one track of signal Vi in the video tape recording format and amplifies the signal Vi by a predetermined level. The signal discriminating unit 5 which receives the output V 1 of the main body determines whether a signal is present and outputs the discriminating signal V 2 to the mode selection unit 6.

즉, 비디오테이프에 아날로그신호가 기록되어 있어 영상신호(Vi)가 헤드/프리앰프(4)에서 충분히 재생된 신호(V1)가 출력하면 신호판별부(5)는 아날로그신호가 기록되어 있음을 판별하고 이 판별신호(V2)를 입력받은 모드선택부(6)는 아날로그 재생모드를 선택하게 된다.That is, that there is an analog signal recorded on a video tape a video signal (Vi) a head / preamplifier When 4 is fully reproduced signal (V 1) output from the signal discrimination section 5, the analog signal is recorded The mode selection unit 6 which discriminates and receives this discrimination signal V 2 selects the analog reproduction mode.

이에 따라, 시스템제어부(1)의 제어신호(VS1)(VS2)(VS3)에 의해 캡스탄속도계(2)가 캡스탄(Capstan)을 정속(Vt)으로 회전시켜 테이프를 이송시키고 드럼속도계 (3)의 헤드드럼을 1800rpm으로 회전시킴과 아울러 헤드/프리앰프(4)의 아날로그 헤드를 반복스위칭시키면 아날로그재생부(7)는 모드선택부(6)의 모드선택에 따른 재생 루프(Loop)의 아날로그신호(VA1)를 입력받아 복조시킴으로써 엔티에스씨(NTSC)의 영상을 재현한다.Accordingly, the capstan tachometer 2 rotates the capstan at a constant speed Vt by the control signals VS 1 (VS 2 ) and VS 3 of the system control unit 1 to convey the tape and to the drum. When the head drum of the speedometer 3 is rotated to 1800 rpm and the analog head of the head / preamplifier 4 is repeatedly switched, the analog reproducing section 7 regenerates the loop according to the mode selection of the mode selecting section 6. The analog signal VA 1 is inputted and demodulated to reproduce an NTSC image.

또한, 비디오테이프에 디지탈신호가 기록되어 있어 영상신호(Vi)가 헤드/프리앰프(4)의 아날로그 헤드에서 충분히 재생되지 않으면 이 재생신호(V1)를 입력받은 신호판별부(5)는 디지탈신호가 기록된 것으로 판별하여 이 판별신호(V2)를 입력받은 모드선택부(6)는 디지탈 재생모드를 선택함으로써 디지탈 재생루프(Loop)가 형성되어 진다.In addition, if a digital signal is recorded on the video tape and the video signal Vi is not sufficiently reproduced by the analog head of the head / preamplifier 4, the signal discriminating unit 5 which receives this reproduction signal V 1 is a digital signal. is received to determine that the signal is written into the determination signal (V 2) the mode selection unit 6 by selecting a playback mode, the digital reproduced digital loop (loop) is formed.

따라서, 시스템제어부(1)의 제어신호(VS1)(VS2)(VS3)에 의해 캡스탄속도계 (2)가 캡스탄(Capstan)을 아날로그 모드의 1/2속도(1/2Vt)로 회전시켜 테이프를 이송시키고 드럼속도계 (3)의 헤드드럼을 3600rpm으로 회전시킴과 아울러 헤드/프리앰프(4)의 디지탈 헤드를 반복스위칭시키면 디지탈재생부(8)는 모드선택부(6)의 모드선택에 따른 디지탈신호(VD1)를 입력받아 복조시킴으로써 고밀도의 디지탈 영상을 재현한다.Accordingly, the capstan tachometer 2 converts the capstan to 1/2 speed (1/2 Vt) of the analog mode by the control signals VS 1 (VS 2 ) and VS 3 of the system control unit 1. The tape is rotated to transfer the tape, the head drum of the drum tachometer 3 is rotated at 3600 rpm, and the digital head of the head / preamplifier 4 is repeatedly switched. A high density digital image is reproduced by receiving and demodulating a digital signal VD 1 according to a selection.

한편, 테이프에 아날로그신호와 디지탈신호가 교대로 기록되어 있는 경우 테이프의 재생동작중 헤드로 신호가 검출되지 않으면 초기 판별동작과 동일하게 시스템제어부(1)의 제어에 따라 스틸(steel) 재생모드에서 모드판별을 수행한 후 해당모드의 재생동작을 수행하게 된다.On the other hand, if the analog signal and the digital signal are alternately recorded on the tape, and if the signal is not detected by the head during the tape reproducing operation, in the steel regeneration mode under the control of the system controller 1 in the same manner as the initial discriminating operation. After the mode discrimination, the playback operation of the mode is performed.

상기에서 상세히 설명한 바와 같이 본 발명은 비디오테이프를 재생하면 한 트랙분의 영상신호를 검출하여 아날로그신호인지 디지탈신호인지를 판별하고 이 판별에 따라 해당 모드의 재생동작을 자동으로 수행함으로써 신호가 교대로 혼합되어 기록된 경우에도 한 번의 조작으로 테이프를 재생할 수 있어 사용자에게 만족감을 주는 효과가 있다.As described in detail above, when the video tape is reproduced, the present invention detects a video signal for one track to determine whether it is an analog signal or a digital signal, and automatically performs a reproducing operation of a corresponding mode according to this determination. Even when mixed and recorded, the tape can be reproduced in one operation, thereby providing an effect to the user.

Claims (1)

테이프의 재생명령(CPB)을 입력받아 시스템의 동작을 제어하고 디지탈 재생모드 또는 아날로그 재생모드중 한 모드를 선택하도록 제어신호를 출력하는 시스템 제어부(1)와, 이 시스템 제어부(1)의 제어신호(VS1)에 따라 캡스탄(Capstan)의 구동을 제어하는 캡스탄 속도계(2)와, 상기 시스템제어부(1)의 제어신호(VS3)에 따라 헤드드럼의 회전속도를 제어하는 드럼 속도계(3)와, 상기 시스템제어부(1)의 제어신호(VS2)에 따라 해당 모드의 헤드가 반복 스위칭되고 이에 따라 영상신호(Vt)를 소정레벨 증폭하는 헤드/프리앰프(4)와, 이 헤드/프리앰프 (4)의 출력(V1)에서 검출한 재생신호의 재생특성량이 양호한지 판별함에 따라 신호의 유무를 판별하는 신호판별부(5)와, 이 신호판별부(5)의 출력(V2)에 따라 재생 특성량이 양호하면 아날로그 재생부(7)로 재생 루프(Loop)를 형성하고 재생 특성량이 불량하면 디지탈 재생부(8)로 재생 루프를 형성하는 모드 선택부(6)로 구성함을 특징으로 하는 기록재생장치의 기록신호 판별회로.A system controller 1 which receives a tape play command C PB to control the operation of the system and outputs a control signal to select one of the digital play mode and the analog play mode, and the control of the system control 1 Capstan speedometer (2) for controlling the operation of the capstan in accordance with the signal VS 1 , and drum speedometer for controlling the rotational speed of the head drum in accordance with the control signal (VS 3 ) of the system control unit (1) (3) and a head / preamplifier 4 for repeatedly switching the head of the mode in accordance with the control signal VS 2 of the system controller 1 and amplifying the video signal Vt by a predetermined level. A signal discriminating unit 5 for discriminating whether a signal is present or not, and an output of the signal discriminating unit 5, which discriminates the presence or absence of a signal according to whether the reproduction characteristic amount of the reproduction signal detected at the output V 1 of the head / preamplifier 4 is good. If the reproducing characteristic amount is good according to (V 2 ), the reproducing loop is made to the analog reproducing section 7 And a mode selector (6) for forming a loop in the digital reproducing section (8) if a loop is formed and the reproduction characteristic amount is poor.
KR1019930001574A 1993-02-05 1993-02-05 Recording signal distinction circuit of recording & playing system KR950005247B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1019930001574A KR950005247B1 (en) 1993-02-05 1993-02-05 Recording signal distinction circuit of recording & playing system
US08/703,838 US5838875A (en) 1993-02-05 1996-08-27 Apparatus and method for discriminating between analog and digital video signals in high definition video cassette recorder

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KR1019930001574A KR950005247B1 (en) 1993-02-05 1993-02-05 Recording signal distinction circuit of recording & playing system

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KR940020378A KR940020378A (en) 1994-09-16
KR950005247B1 true KR950005247B1 (en) 1995-05-22

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