PCM audio signal reproducing apparatus
US4748517A · kind A · utility
10Cited by
3References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 1986 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Jun 18, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/913
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an apparatus for reproducing either a video signal or a PCM (pulse code modulated) audio signal from a record medium, the existence of a PCM audio signal recorded on the record medium is detected in response to an identifying pilot signal recorded together with the PCM audio signal, and, when a video signal is being reproduced, detection of a PCM audio signal is obviated. Thus, even if the identifying pilot signal and a portion of the video signal are superposed upon each other on a frequency axis, erroneous assumption of the presence of a recorded PCM audio signal can be avoided to prevent incorrect reproducing operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.