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1. (WO2018085025) ON/OFF HEAD DETECTION OF PERSONAL ACOUSTIC DEVICE USING AN EARPIECE MICROPHONE

Pub. No.:    WO/2018/085025    International Application No.:    PCT/US2017/056714
Publication Date: Sat May 12 01:59:59 CEST 2018 International Filing Date: Tue Oct 17 01:59:59 CEST 2017
IPC: H04R 1/10
H04R 5/033
H04R 29/00
Applicants: BOSE CORPORATION
Inventors: SHETYE, Mihir D.
OOMMEN, Binu K.
MCELHONE, Dale
Title: ON/OFF HEAD DETECTION OF PERSONAL ACOUSTIC DEVICE USING AN EARPIECE MICROPHONE
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.