Samsung Electronics Co., Ltd.

Jong-gyu Lee

Young-gi Kwon

Gyu-Yeong Son

A method for controlling the speed of a capstan motor in a video cassette recorder (VCR) includes modulating a capstan frequency generating (CFG) signal into a pulse signal. Time intervals corresponding to one of a rising edge to a next rising edge and a falling edge to a next falling edge of the pulse signal are calculated. The calculated time intervals are compared to a target time to obtain a difference therebetween. A rotation speed of the capstan motor is compensated based on the obtained difference to control the rotation speed of the capstan motor.

Method and apparatus for controlling speed of capstan motor of a video cassette recorder

A method for controlling tracking position during low-speed reproducing in a video cassette recorder (VCR) which provides noise suppression noise and increased image quality. In one aspect, in a VCR having a pair of main heads for reproducing video signals from a recording medium at a normal operating speed associated with said VCR, a method for controlling tracking position when reproducing at speeds lower than the normal speed comprises the steps of: detecting a period of an envelope waveform of a video signal which is reproduced by the pair of main heads; generating a pseudo head switching pulse (PHSP) signal in accordance with the detected period; and tracing a tracking position at a position where a voltage level of the envelope waveform is the largest within one period of the PHSP signal.

Method for controlling tracking position during low-speed reproducing in a video cassette recorder

A method for low-speed reproducing in a video cassette recorder (VCR) having a pair of main heads for normal-speed reproducing and at least a pair of additional heads neighboring said main heads is disclosed. A period which is regularly repeated from an envelope waveform of a video signal reproduced by said main heads is detected. The voltage level of the detected envelope waveform is then compared with a voltage level of the envelope waveform detected by the additional heads by generating a pseudo head switching pulse for switching the operation state of said main heads and additional heads according to the detected period. And, a reproduced signal from one of the said main and additional heads which has the envelope waveform having a high voltage level detected, thereby reproducing a high quality continuous time varying image without a noise.

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Kyonggi-do, South Korea

Jong-gyu Lee