Videodisc reproducing apparatus

Details Videodisc reproducing apparatus Videodisc reproducing apparatus

1989-02-01

1991-10-29

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 358320, 358323, 358335, 358339, 358158, 360 361, 360 362, H04N 576

Patent

active

050620053

ABSTRACT:
A videodisc reproducing apparatus includes a pilot carrier extraction circuit for extracting a pilot carrier from a videodisc reproduced signal and a clock generating circuit. The clock generating circuit includes an analog/digital converter and a phase-locked loop oscillator for generating a sampling clock signal for the analog/digital converter, whereby the videodisc reproduced signal is converted into digital form in synchronism with the pilot carrier. A phase-shift circuit is provided for phase shifting the sampling clock signal and for applying a thus phase-shifted sampling clock signal to the analog/digital converter. A phase detecting circuit is provided for detecting a digital sampling phase of a synchronizing signal included in a MUSE signal of the videodisc reproduced signal which has been converted into digital form according to positional information in the synchronizing signal of the videodisc reproduced signal detected by a synchronizing signal detection circuit. The phase detecting circuit further detects whether the detected digital sampling phase is advanced or retarded with respect to a digital sampling phase of a specified normal MUSE signal. An up/down counter is provided for generating an address signal output according to an output of the phase detecting circuit to control the phase-shift circuit.

REFERENCES:
patent: 4488170 (1990-07-01), Nillesen
patent: 4672470 (1987-06-01), Morimoto et al.
patent: 4677499 (1987-06-01), Shirota et al.
patent: 4733311 (1990-07-01), Yoshinaka
Toyama et al., Optical Videodisc for High-Definition Television by the MUSE, Jan. 1986, pp. 25-29, Dec. 1985.

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