Microphone actuation control system suitable for teleconference systems
US4658425A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1986 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Jun 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2201/401
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A microphone and loudspeaker arrangement for use in a teleconference system, wherein a plurality of microphones are held in a fixed relationship to a loudspeaker. The microphones are independently gated ON in response to (1) speech picked up by the microphone, (2) a loudspeaker signal driving the loudspeaker and (3) an electrical signal related to the microphone signals of the other associated microphones. A noise adapting threshold circuit generates a voltage level representative of background noise which is compared with the microphone signal of a respective microphone for determining whether the microphone is receiving speech. A decisional circuitry monitors the microphone signal of the associated microphone with respect to a MAX bus which carries microphone signals representative of the level of microphone signals at the other microphones. The decisional circuitry generates a signal indicating that the associated microphone is the first loudest microphone signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.