Apparatus for recording and reproducing a digital signal
US4525752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1983 |
| Grant date | Jun 25, 1985 |
| Priority date | — |
| Expiry date | Feb 10, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/913
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for reproducing a digital signal recorded on a recording medium in the form of successive data blocks, in which each data block includes at least plural data words and a block address circulating with a predetermined phase relation to a certain reference signal. In accordance with the reference signal, a control signal is recorded on the recording medium. The control signal is reproduced from the recording medium and a reference phase signal with a frequency of an integral multiple of more than twice the frequency of the control signal is sampled by the control signal, and a phase comparison output and a lock mode signal are generated from the sampling output. The running phase of the recording medium is controlled by the phase comparison output whereby the fluctuation of running speed of the recording medium due to discontinuities of the control signal can be suppressed. Further, by the lock mode signal, it becomes easy to change the phase of a block address which will be added to a newly recordable digital signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.