Apparatus and method for matching the response of microphones in magnitude and phase
US7113604B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 2003 |
| Grant date | Sep 26, 2006 |
| Priority date | — |
| Expiry date | Mar 9, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R29/006
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus is provided for matching the response of a pair of microphones. The two microphones provide a first and second output, respectively, in response to an audible input. The microphone outputs are subtract from each other to produce a gain control output for operably controlling the gain of the first microphone output, resulting in a gain compensated microphone output. A phase adjustment circuit also is provided responsive to the gain compensated microphone output and a rolloff control output for producing a matching output. The rolloff control output is generated by a phase difference subtractor circuit responsive to both the matching output and the second microphone output. Moreover, the output of at least one of the microphones has a resonance frequency that is shifted to a desired preselected frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.