Dual-microphone frequency amplitude response self-calibration
US9532139B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2012 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | May 7, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A frequency domain method and system for online self-calibrating microphone frequency amplitude response based on noise floor (minima) tracking are disclosed. A cellular telephone or other system with dual microphones may self-calibrate itself on-the-fly. The system selects one of the microphones as a reference and calibrates the frequency response of the two microphones using the first microphone as a reference, so that they have a matched frequency amplitude response. To achieve this on-the-fly calibration, the system uses background noise for calibration purposes. The signal power spectra of the noise minima at the two microphones is used to calibrate the respective microphone frequency response. The system may then adapt the frequency amplitude responses of the two microphones so that the power spectral density from each microphone matches the other, and the system is then calibrated. This calibration could occur any time the device is receiving a noise minima and could be done continuously as the device is being used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.