Telephone having improved hands free operation audio quality and method of operation thereof

  • US 6,785,381 B2
  • Filed: 11/27/2001
  • Issued: 08/31/2004
  • Est. Priority Date: 11/27/2001
  • Status: Active Grant
First Claim
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1. A telephone having a hands-free mode of operation, said telephone comprising:

  • a first microphone receiving sound in hands-free mode, and providing first audio signals representative of received sounds to a first delay path;

    a second microphone receiving said sounds in hands-free mode and providing second audio signals representative of said received sounds to a second delay path, said second microphone spaced a selected distance from said first microphone;

    an adder combining said first audio signals from said first delay path with said second audio signals from said second delay path;

    an analysis and control unit analyzing received said signals and adjusting delay through said second delay path; and

    an adjustable filter receiving combined said signals from said adder and filtering noise from said combined signals.

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