Videodisc reproducing apparatus
US5062005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 1989 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Feb 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/87
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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 i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.