Sound actuated microphone system
US4489442A · kind A · utility
81Cited by
21References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Dec 18, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microphone channel is constructed from a pair of unidirectional microphone elements mounted back-to-back for monitoring sound coming from a predetermined area of space. The output signals of each microphone element are converted to D.C. logarithmic signals which are compared for gating an electrical output signal of a microphone element to the output/amplifying system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.