The regulation of automated response during ear coupling detection and noise are eliminated in personal audio device

The regulation of automated response during ear coupling detection and noise are eliminated in personal audio device

  • CN 107,295,443 A
  • Filed: 04/30/2012
  • Published: 10/24/2017
  • Est. Priority Date: 06/03/2011
  • Status: Active Application
First Claim
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1. a kind of method that ambient audio sound is eliminated near the transducer of personal audio device, methods described includes:

  • Ambient audio sound is measured using reference microphone to provide the first measurement of reference microphone signal;

    The output of the transducer is measured using error microphone to provide the second measurement of error microphone signal;

    By adjusting the response of sef-adapting filter, anti-noise signal adaptively is produced from the reference microphone signal, is used forThe influence of the ambient audio sound at transducer voice output is offset, the sef-adapting filter filters the defeated of the reference microphoneGo out;

    The anti-noise signal is synthesized with source audio signal, to produce the audio signal for being supplied to the transducer;

    The secondary path sef-adapting filter responded is estimated to source audio shaping using with secondary path, it is shaped to produceSource audio;

    The shaped source audio is removed from the error microphone signal, anti-noise and surrounding have been synthesized to provide instructionThe error signal of audio sound is to hearer;

    Wherein, the adaptability produces the response of the adjustment sef-adapting filter so that error signal is minimized;

    The coupling between the ear of the transducer and the hearer is determined from the coefficient value of the secondary path sef-adapting filterChange that is right and detecting the degree of coupling;

    Degree of coupling change between the detected transducer and the ear of the hearer as one man changes describedThe response of sef-adapting filter;

    The anti-noise signal is synthesized with source audio signal, andIt is supplied to the transducer to produce voice output the result of the synthesis.

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