Adaptive close-talking differential microphone array
US7123727B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2001 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Apr 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R29/006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for providing a differential microphone with a desired frequency response are disclosed. The desired frequency response is provided by operation of a filter, having an adjustable frequency response, coupled to the microphone. The frequency response of the filter is set by operation of a controller, also coupled to the microphone, based on signals received from the microphone. The desired frequency response may be determined based upon the orientation angle and the distance between the microphone and a source of sound. The frequency response of the filter may comprise the substantial inverse of the frequency response of the microphone to provide a flat response. In a preferred embodiment, the gain of the differential microphone is adjusted so that the output level is effectively independent of microphone position relative to the source. In particular embodiments, the controller may determine, based on the distance from the sound source, whether to operate the differential microphone in a nearfield mode of operation or a farfield mode of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.