Microphone system for communication devices
US7751575B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Sep 25, 2003 |
| Grant date | Jul 6, 2010 |
| Priority date | — |
| Expiry date | Jul 2, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/05
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The microphone system for communication devices that comprises an electric circuit comprising two microphone elements connected to a signal flow processor. This processor uses a digital signal processor or comparable analog circuitry to provide a particular electrical time delay (τ) to one of the microphone elements (nearest the ear or loudspeaker) and a compatible amplitude gain (Gm1) to the other microphone element (nearest the user's mouth) in order to substantially reduce the external acoustic coupling and echo of communication devices in the receive and doubletalk state. Further, this processing system allows the microphone system to reduce the pickup of ambient noise in the send and idle state, while still being sensitive to the user's speech.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.