On/off head detection of personal acoustic device using an earpiece microphone
US9838812B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 2016 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Nov 3, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of controlling a personal acoustic device includes generating a first electrical signal responsive to an acoustic signal incident at a microphone disposed on an earpiece of the personal acoustic device. A characteristic of a transfer function based on the first electrical signal and a second electrical signal provided to a speaker in the earpiece is determined. An operating state of the personal acoustic device is determined form the characteristic of the transfer function. The operating state include a state in which the earpiece is positioned in the vicinity of an ear of a user and a second state in which the earpiece is absent from the vicinity of the ear of the user. Examples of a microphone that may be used include feedback and feedforward microphones in an acoustic noise reduction circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.