Disc controlling apparatus for displaying the status of playback information
US6493293B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2000 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Jan 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/65
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical or magnetic disc audio system, during conventional play the audio is decoded and played from the disc (RDISC) under the direction of a presentation control (PC) and the subcodes indicating time on the disc, track number and so forth are generated. Depending on the system hardware, for some speeds and directions (other than normal play) it may not be possible to decode real subcodes from the disc, and an emulator module (EMU) is switched in at these times. The emulator (EMU) plays a virtual disc (VDISC) using a timer (TIM) and the table of contents (TOC) from the real disc. While the audio is not replayed, the track and time listing display (DISP) is kept up to date, with a typical update for each second of real disc play time. As an extension to this feature, the emulator module (EMU) periodically generates seek commands for the read head in relation to the real disc (RDISC) such that, when normal playback is resumed, there is minimal delay in locating the chosen audio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.