Apparatus for reproducing data signal
US4685098A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1984 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Nov 7, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data signal reproducing apparatus reproduces digital data from a recording medium on which a digital data signal modulated in accordance with the run length limited code modulation is recorded together with a synchronous signal. The apparatus is improved so that erroneous detection of a false synchronous signal is avoided when there is a defective part on the recording surface of the recording medium. In the apparatus, a reproduced signal of rectangular waveform from waveform shaping means (9) is prevented from being supplied to reproduced signal processing means (13) when the amplitude of a head output signal detected by amplitude detecting means (14 to 17) is less than a predetermined value, thereby avoiding erroneous detection of the false synchronous signal. The apparatus is suitable for being constituted to be a player for a digital audio disc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.