Method and apparatus for signaling the volume level of reproducing apparatus for digitally recorded sound
US4847825A · kind A · utility
Inventor
Key dates
| Filing date | Aug 10, 1987 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Aug 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/913
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to warn persons who are about to listen to sound performances from player apparatus using digital records and particularly those listeners using headphones, of the volume setting of the record player, a warning sound having an amplitude substantially lower than the amplitude of the recorded performance, and proportional to the volume setting of the player, is generated for a few seconds before the player begins to reproduce the performance. The warning signal may emanate from digital signals encoded on the record media before each recorded performance, or alternatively, may be generated by circuitry built into the player that generates its own warning tone for a few seconds following the actuation of the "play" button.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.