System for playing video information recording disks, capable of

Details System for playing video information recording disks, capable of System for playing video information recording disks, capable of

1987-10-13

1989-05-30

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358339, 358342, H04N 595

Patent

active

048356239

ABSTRACT:
A video information playback system for playing the so called CLV disks which uses a digital video memory for enabling special playback mode operations such as the SLOW mode, the STILL mode, and the FAST mode. In order to simplify the construction of the system, a frequency of write and read clock signals used in the digital video memory is selected n times the horizontal synchronizing signal frequency. A time base servo control part of the system is controlled using a phase difference signal between a playback synchronizing signal and a reference signal whose frequency is 1
time the frequency of the write and read clock signals. During a track jump operation for a special playback mode operation, a supply of the write clock signal and/or the read clock signal to the reference signal generator is stopped so that the phase difference is maintained constant before and after the track jump operation.

REFERENCES:
patent: 4277796 (1981-07-01), Ross
patent: 4313129 (1982-01-01), Fukui
patent: 4439849 (1984-03-01), Nabeshima
patent: 4519004 (1985-05-01), Wilkinson et al.
patent: 4603412 (1986-07-01), Yamazaki
patent: 4608610 (1986-08-01), Tatsuguchi
patent: 4638375 (1987-01-01), Motoyama

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