System for correcting time base error of information reproducing

Details System for correcting time base error of information reproducing System for correcting time base error of information reproducing

1986-06-11

1988-05-17

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358342, H04N 595

Patent

active

047454946

ABSTRACT:
A light emitted from a laser diode is reflected by a video disc which is rotated by a spindle motor. The reflected light is modulated by video information recorded on the video disc and converted to an electrical signal by a photodiode array. A signal generated by a trapezoidal generator is sampled with a horizontal synchronizing signal separated from the video information signal. The sampled signal is supplied to the spindle motor for correcting a time base error. A zero crossing point of the trapezoidal waveform is detected and is utilized for controlling the start of a rise portion of the trapezoidal waveform for compensating a DC offset. The trapezoidal waveform is controlled so as to vary an average power supplied to the spindle motor in accordance with a detected rotational speed difference so as to compensate a rotational speed of the spindle motor.

REFERENCES:
patent: 4053926 (1977-10-01), Lemoine et al.
patent: 4208674 (1980-06-01), Kuniyoshi et al.
patent: 4415935 (1983-11-01), Suzuki
patent: 4609948 (1986-09-01), Okano

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