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Active noise control earpiece being compatible with magnetic coupled hearing aids

  • US 5,740,257 A
  • Filed: 12/19/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 12/19/1996
  • Status: Expired due to Term
First Claim
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1. Apparatus for use in an active noise control arrangement comprising:

  • receiver apparatus including an interior cavity and acoustic output ports for emanating sound into an ear cavity;

    an input for an input signal;

    a receiver element disposed in the interior cavity and being supplied with a first signal for emitting an acoustic signal into the interior cavity;

    a transducer arranged so that it will be disposed in the ear cavity when in use or be disposed in the interior cavity for communicating to the ear cavity when in use by an acoustic point for generating a second signal representative of the acoustic signal including any ambient noise signal present in the ear cavity;

    an algebraic combining unit for algebraically subtracting the second signal from the input signal to generate a third signal;

    modification apparatus for modifying the third signal in a manner to generate the first signal; and

    a coil arrangement disposed in the interior cavity and being responsive to a modified version of the input signal for generating a magnetic field substantially free of room noise effects, the magnetic field being intended to drive a magnetically coupled hearing aid including a telecoil being employed by a user of the handset, so that reduced acoustic noise coupling is realized to magnetically coupled hearing aids to be employed by users.

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