Intermittent errors in digital disc players
US6278784A · kind A · utility
Inventor
Key dates
| Filing date | Dec 20, 1998 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Dec 20, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2562
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for automatically and non-invasively detecting and recording random and/or intermittent errors made during play by digital disc players without supervision, without need for invasive player component testing or disassembly, and without need for analyzing complex waveforms, or use of high level processors. Intermittent errors are found in an actual playback audio signal derived from the output of a digital disc player. A test digital disc prerecorded with a test tone comprising an expected audio signal is played, while an analyzer reads the actual playback audio signal produced, and detects deviations of the actual playback audio signal from the expected audio signal. To detect deviations of the actual playback audio signal from the expected audio signal, the analyzer can comprise an amplitude detection circuit, a phase detection circuit, and a noise detention circuit, each optionally generating character signals that simplify processing. Embodiments allow intermittent error detection for players giving only digital output, through a frame decoder and D-A converter to derive, from the actual playback digital signal, the actual playback audio signal needed. Low r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.