Equipment for playing back data
US5134599A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1988 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Sep 28, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08517
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for skipping tracks in apparatus playing back data that is readable from data-storage tracks on a recording medium by an optical scanner when a base of light is positioned on the tracks by a tracking circuit. The optical scanner is shifted from one data track to another by a skipping pulse during a track-skipping procedure, and is halted in place there by a braking pulse. The tracking circuit is opened not prior to the beginning of the skipping pulse and not later than the departure from the data-storage track. The optical scanner is braked by a first braking pulse of constant length and amplitude, but which is too small. A second braking pulse is produced with pulse characteristics dependent on the time that elapses until a predetermined point on the next data-storage is arrived at. The second braking pulse thereby halts the scanner in the middle of the next data-storage track. The tracking circuit is then closed, but not prior to the beginning of the second braking pulse and not later than the middle of the next data-storage track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.