Apparatus for recording/reproducing a digital signal at variable speeds
US4942487A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1988 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Feb 19, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B15/4678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital signal recording/reproducing apparatus for enabling recording/reproduction at variable speeds including normal speed, and at least one of N-times normal speed and 1/N-times normal speed while maintaining the reproducing frequency constant so as to not require switching of analog circuits. At the time of reproduction at normal speed, N-times normal speed or 1/N-times normal speed, the feed speed of the magnetic tape and the timing of picking up of a reproducing signal from the magnetic tape are varied while the speed of revolution of a cylinder of a rotary head is maintained constant so that the timing of detection of pilot signals for generating a tracking error signal is varied to cope with difference in track scanning conditions in recording and reproducing modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.