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1. (WO2018178639) APPARATUS AND METHODS FOR MONITORING A MICROPHONE

Pub. No.:    WO/2018/178639    International Application No.:    PCT/GB2018/050754
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 23 00:59:59 CET 2018
IPC: H04R 29/00
H04R 19/00
G01K 11/26
Applicants: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LIMITED
Inventors: LESSO, John Paul
HARDY, Emmanuel Philippe Christian
Title: APPARATUS AND METHODS FOR MONITORING A MICROPHONE
Abstract:
This application relates to an apparatus (300) for monitoring an operating temperature condition of a microphone device (100) having an acoustic port (1 10). The apparatus includes a spectrum peak detect block (301) for receiving a microphone signal (SMIC) and determining, from the microphone signal, a resonance frequency (fH) and a quality factor (QH) of a resonance (202) associated with the acoustic port of the microphone. A condition monitoring block (302) is configured to determine any change in resonance frequency and quality factor with respect to respective reference values of resonance frequency and quality factor and to determine a temperature condition for the air temperature within the acoustic port based on said determined changes.