KR940012371A - Finestil device and finestil control method of video cassette recorder - Google Patents

Finestil device and finestil control method of video cassette recorder Download PDF

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Publication number
KR940012371A
KR940012371A KR1019920021200A KR920021200A KR940012371A KR 940012371 A KR940012371 A KR 940012371A KR 1019920021200 A KR1019920021200 A KR 1019920021200A KR 920021200 A KR920021200 A KR 920021200A KR 940012371 A KR940012371 A KR 940012371A
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KR
South Korea
Prior art keywords
still
pwm
pulse
fine
capstan motor
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KR1019920021200A
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Korean (ko)
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KR970008648B1 (en
Inventor
이광희
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이헌조
주식회사 금성사
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Priority to KR1019920021200A priority Critical patent/KR970008648B1/en
Publication of KR940012371A publication Critical patent/KR940012371A/en
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Publication of KR970008648B1 publication Critical patent/KR970008648B1/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
    • G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

본 발명은 비디오 카세트 레코더(VCR)에서 재생중 일시 정지화면(스틸;STILL)출력시에 화면상에 나타나는 잡음을 최소화시키는 위치로 캡스턴 모터를 가변펄스폭 변조된 구동신호로 자동 제어하여 파인스틸(Fine Still)을 수행시켜주는 장치와 그 파인스틸 제어방법에 관한 것으로, 종래의 파인스틸 장치에 의하면 캡스턴을 포함하는 데크의 주행계의 부하가 증가되거나 캡스터 모터의 기동 토오크(TORQUE)가 낮은 경우에는 이러한 변수요인의 고려없이 일정 듀티의 펄스만으로 캡스터 모터구동을 수행하므로 정확한 파인스틸이 어렵고, 따라서 스틸화면의 화질이 크게 저하되며, 각각의 VCR 세트마다 나타나는 편차에 따라 미세하게 서로 다른 스틸제어(구동펄스의 공급제어)가 요구됨에도 이에 대응하지 못하여 기기의 품질이 저하되었던 문제점을 해결하기 위한 것이다.According to the present invention, the capstan motor is automatically controlled by a variable pulse width modulated driving signal to minimize the noise appearing on the screen when the still picture (still) is output during playback in a video cassette recorder (VCR). Fine Still) and a method of controlling the fine steel, and according to the conventional fine-steel device when the load of the traveling system of the deck including the capstan is increased or the starting torque of the capster motor is low In this case, it is difficult to precisely fine the steel because it performs the capster motor driving only with a certain duty pulse without considering these variable factors. Therefore, the picture quality of the steel screen is greatly deteriorated. To solve the problem that the quality of the device is deteriorated due to the failure of the supply pulse supply control One will.

본 발명은 스틸화면 재생시에 비디오 RF 엔벨로프 파형의 디지탈 레벨을 헤드 스위칭신호의 라이징엣지 또는 폴링엣지에서 샘플앤드 홀드하고 이 값이 최대값이 되도록 캡스턴 모터 구동 펄스(펄스폭 변조 : PWM)의 변조폭을 가변 제어하고 최적 펄스폭 정보를 다음의 스틸 제어를 위한 초기정보로 저장하여 활용하므로서 정확한 파인스틸과 고화질 확보 및 세트별 편차에 대응하는 비디오 카세트 레코더의 파인스틸 장치와 그 제어방법을 제공한 것으로 VCR에 적용한다.In the present invention, the modulation level of a capstan motor driving pulse (pulse width modulation: PWM) is sampled and held so that the digital level of the video RF envelope waveform is held at the rising edge or falling edge of the head switching signal when the still picture is reproduced. To control the fine pulse width and store the optimum pulse width information as initial information for the next still control. Applies to VCR.

Description

비디오 카세트 레코더의 파인스틸 장치와 파인스틸 제어방법Finestil device and finestil control method of video cassette recorder

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제3도는 본 발명의 비디오 카세트 레코더 파인스틸 장치 블록구성도,3 is a block diagram of a video cassette recorder finest device of the present invention;

제4도는 본 발명의 비디오 카세트 레코더 파인스틸 제어방법의 플로우챠트.4 is a flowchart of a video cassette recorder fine steel control method of the present invention.

Claims (2)

재생되는 비디오 RF 엔베로프 검파신호를 디지탈 신호로 변환하는 A/D 변환기(1)와, 상기 디지탈 엔벨로프검파신호를 샘플앤드 홀드하여 화면상의 노이즈가 최소가 되는 RF시의 PWM 듀티정보를 저장 및 해독하여 PWM 펄스발생을 제어하는 CPU(2)와, 캡스턴 모터(M1)에 가해지는 구동펄스의 폭을 상기 CPU(2)의 제어를 받아 가변시켜 발생해주는 PWM 발생부(3)와, 상기 화면상의 노이즈가 최소가 되는 PWM 듀티정보가 기억되는 메모리부(4)와, 상기 A/D 변환기(1)와 CPU(2) 및 PWM 발생부(3)를 포함하며 스틸시에 캡스터 모터(M1)를 제어하는 마이커(5)으로 구성된 비디오 카세트 레코더의 파인스틸 장치.A / D converter 1 for converting a reproduced video RF envelope detection signal into a digital signal, and storing and decoding PWM duty information at the time of RF that minimizes noise on the screen by sample-and-holding the digital envelope detection signal. CPU 2 for controlling PWM pulse generation, PWM generator 3 for generating a variable width of the driving pulse applied to the capstan motor M1 under the control of the CPU 2, and on the screen. A memory unit 4 storing PWM duty information for minimizing noise, the A / D converter 1, the CPU 2, and the PWM generating unit 3; Finestain device of the video cassette recorder composed of a microphone (5) for controlling the. 재생중 일시 정지(스틸)수행여부를 판단하여 스틸수행인 경우에는 캡스턴 모터의 구동을 위한 PWM 펄스를 초기화된 듀티의 PWM 펄스로 출력해주고 비디오 RF 엔벨로프 신호레벨을 헤드 스위칭 폴링 및 라이징엣지에서 샘플앤드 홀드하여 그 검색값이 최대값인가의 여부를 판단하는 과정과, 상기 판단결과 최대값이 아닌 경우에는 PWM 펄스의 듀티를 순차적으로 가변시켜 가면서 캡스턴 모터를 기동시키고 그때의 RF 엔벨로프를 검색하여 최대값 여부를 판단하는 과정과, 상기 판단결과 최대값이면 캡스턴 모터기동을 정지시켜 스틸화면을 재생해주고 그때의 PWM 듀티값을 차후의 스틸제어를 위한 상기 PWM 듀티 초기값으로 저장해주는 과정으로 이루어진 비디오 카세트 레코더의 파인스틸 제어방법.In case of still performance by determining whether to perform pause (still) during playback, output PWM pulse for driving capstan motor as PWM pulse of initialized duty and sample and output video RF envelope signal level at head switching polling and rising edge. Hold to determine whether or not the search value is the maximum value, and if it is not the maximum value, start the capstan motor while varying the duty of the PWM pulse sequentially and search for the RF envelope at that time. Video cassette recorder comprising: determining whether or not, and if the maximum value is determined, stopping the capstan motor starting to reproduce a still screen, and storing the current PWM duty value as the initial PWM duty value for subsequent still control. How to control fine steel. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920021200A 1992-11-12 1992-11-12 Fine still device and control method of vcr KR970008648B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920021200A KR970008648B1 (en) 1992-11-12 1992-11-12 Fine still device and control method of vcr

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Application Number Priority Date Filing Date Title
KR1019920021200A KR970008648B1 (en) 1992-11-12 1992-11-12 Fine still device and control method of vcr

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KR940012371A true KR940012371A (en) 1994-06-23
KR970008648B1 KR970008648B1 (en) 1997-05-27

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KR1019920021200A KR970008648B1 (en) 1992-11-12 1992-11-12 Fine still device and control method of vcr

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100255347B1 (en) * 1997-06-05 2000-05-01 윤종용 Drive control device and control method for capstan motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100255347B1 (en) * 1997-06-05 2000-05-01 윤종용 Drive control device and control method for capstan motor

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KR970008648B1 (en) 1997-05-27

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