Yang Lu,Dayong Zhou,Jon D. Hendrix,Jeffrey Alderson
申请号：
US13794931
公开号：
US09230532B1
申请日:
2013.03.12
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A personal audio device, such as a wireless telephone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from an output of a microphone that measures ambient audio. The anti-noise signal is combined with source audio to provide an output for a speaker. The anti-noise signal causes cancellation of ambient audio sounds that appear at the microphone. A processing circuit estimates a level of background noise from the microphone output and sets a power conservation mode of the personal audio device in response to detecting that the background noise level is lower than a predetermined threshold.
