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Feedback-cancelling electro-acoustic transducer apparatus

  • US 3,922,488 A
  • Filed: 12/17/1973
  • Issued: 11/25/1975
  • Est. Priority Date: 12/15/1972
  • Status: Expired due to Term
First Claim
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1. An electro-acoustic transducer apparatus comprising a loudspeaker and microphone means having two closely spaced transducers, electronic circuit means, said circuit means including an additive circuit element and a substractive circuit element, each of said elements receiving output from both of said transducers, said elements providing two outputs one of which is wanted sound plus noise and the other of which is only noise, said circuit means comprising also phase adjustment means to receive said other output and to produce a noise component 180* out of phase with said other output, said circuit means comprising also means to combine said one output with said outof-phase component to cancel noise from said one output.

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