Audio recorder with retroactive storage
US5903868A · kind A · utility
Inventors
Key dates
| Filing date | Feb 13, 1996 |
| Grant date | May 11, 1999 |
| Priority date | — |
| Expiry date | Feb 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio recorder with retroactive storage capability operates under control of a sound responsive switch to enter signals representative of the instantaneous amplitude of sound signals received by a microphone into a first-in first-out memory. When the memory is filled, digital signals representative of newly recorded sound supplant the oldest signals in the memory. An operator listening to the sound may retroactively capture signals representative of the most recently occurring sounds against erasure by depressing a pushbutton. Circuitry responsive to the resulting signal removes the most recently generated sound signals from the first-in first-out queue so that they may be later recalled to reproduce the sounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.