Optical disc playback device having uniform frame interval track

Details Optical disc playback device having uniform frame interval track Optical disc playback device having uniform frame interval track

1989-09-29

1993-10-19

Chin, Tommy

Facsimile and static presentation processing

Facsimile

Recording apparatus

358322, 358312, 360 101, 369 58, H04N 576

Patent

active

052551024

ABSTRACT:
An optical disc playback device for playing back video data employs a rotation signal generation circuit for generating a signal at a period of a rotation angle provided by dividing one rotation of a disc motor to detect a record position on a disc of picture data stored in a picture memory. A laser beam spot is caused to jump a predetermined number of tracks each time a position on the disc has a specific relation to the record position in response to a signal generated by the rotation signal generation circuit whereby a still picture playback and a still picture shifting can be made frame by frame. Further, trace angle data necessary for reading one picture data from the disc and a track jump amount necessary for achieving a multiplying number of fast/slow playback speed set on the basis of this trace angle data are obtained in accordance with detected recorded angle amount data and, when computed trace angle amount has been detected by a rotation angle generation circuit, the laser beam spot is caused to jump a computed track jump amount whereby change in a picture in a fast/slow playback can be made uniform regardless of the circumferential position on the disc.

REFERENCES:
patent: 4809094 (1989-02-01), Akiyama
patent: 4814897 (1989-03-01), Kojima et al.
patent: 4835623 (1989-10-01), Okano et al.
patent: 4845572 (1989-07-01), Yasuda
patent: 4858030 (1989-08-01), Oku et al.
patent: 4887253 (1989-12-01), Tateishi
patent: 5001570 (1991-03-01), Tagawa

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