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Electronic audio device and method of operation

  • US 5,771,297 A
  • Filed: 08/14/1995
  • Issued: 06/23/1998
  • Est. Priority Date: 08/12/1994
  • Status: Expired due to Fees
First Claim
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1. An electronic audio device comprising:

  • an audio stage having an audio output for providing an audio output signal;

    an acoustic transducer coupled to the audio output for outputting an acoustic signal;

    a microphone element with selectable gain, acoustically coupled to the acoustic transducer to provide a feedback signal representative of the output of the acoustic transducer;

    a comparator coupled to the audio stage and the microphone element for comparing parameters of the audio output signal and parameters of the feedback signal;

    a control circuit responsive to the comparator for controlling the audio stage when a parameter of the feedback signal differs from that parameter of the audio output signal by a predetermined amount;

    a microphone gain switching element for increasing the gain of the microhone element for monitoring of ambient noise and decreasing the gain for provision of the feedback signal; and

    a volume control element for controlling the audio output signal responsive to the control circuit to reduce the volume of the acoustic signal when the difference between the feedback signal parameter and the audio output signal parameter indicates distortion in the audio output signal.

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