Apparatus to control time base fluctuation in a signal from a de

Details Apparatus to control time base fluctuation in a signal from a de Apparatus to control time base fluctuation in a signal from a de

1982-12-06

1986-09-02

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358342, H04N 5781

Patent

active

046099484

ABSTRACT:
A time base control unit in an apparatus for reproducing recorded information from a disc is provided, which comprises information reproduction processing means for reading and processing the recorded information, disc rotating means, tracking servo means for jumping an information read-spot, sync separating means for separating a sync signal from the information signal read, reference signal generating means, means for detecting a relation between the sync and reference signals and for outputting a phase difference signal, and time base servo means for compensating the time base fluctuation of the reproduction information signal in response to the phase difference signal. The reference signal generating means serves to coincide the phases of the sync signal and the reference signal before and after the jumping operation in order to permit the time base servo control such as spindle servo or tangential servo to be locked-in immediately after the jumping operation of the read-spot. For this purpose, the reference sync signal generating means is provided with fundamental signal generating means, integrating means and stopping means.

REFERENCES:
patent: 4330791 (1982-05-01), Ohara et al.
patent: 4358796 (1982-11-01), Ceshkovsky et al.
patent: 4388713 (1983-06-01), Tatsuguchi
patent: 4389678 (1983-06-01), Mizukami et al.
patent: 4403259 (1983-09-01), Masaki
patent: 4415935 (1983-11-01), Suzuki
patent: 4423498 (1983-12-01), Kimura et al.

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