Optical disk player with coarse and fine speed control
US5745457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Feb 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk player utilizes an analog read signal generated from a pickup. The analog read signal is converted to a digital read signal consisting of a plurality of bits in synchronism with a sampling clock in an A/D converter. The digital read signal is then decoded in a decoder and decoded data are generated. An error signal according to the difference between an actual rotational speed of the optical disk and a specified speed is generated on the basis of the digital read signal generated from the A/D converter or the decoded data generated from the decoder. And a rotational speed of a spindle motor is controlled in accordance with the error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.