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Multi-frequency transmission system for implanted hearing aids

  • US 4,611,598 A
  • Filed: 04/22/1985
  • Issued: 09/16/1986
  • Est. Priority Date: 05/30/1984
  • Status: Expired due to Fees
First Claim
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1. A multi-frequency transmission system of an implanted hearing aid, comprisingmeans for converting an acoustic signal in an electric signal;

  • a plurality of band pass filters connected to said converting means for filtering different frequency bands in audio frequency range;

    a plurality of high frequency transmitters each transmitting an amplitude modulated high frequency carrier signal;

    a speech processor including a plurality of threshold switching means connected respectively between said band pass filters and inputs of said high frequency transmitters, said threshold switching means having adjustable threshold levels;

    a bipolar transmitting stage including two additional high frequency transmitters connected to said speech processor to generate alternating high frequency pulses of the same length but of different polarity;

    said high frequency transmitters and said additional high frequency transmitters being connected via an end stage to a common transmitting coil;

    a channel selector connected between said high frequency transmitters and said threshold switching means to trigger simultaneously one of said high frequency transmitters and one of said additional high frequency transmitters in said bipolar transmitting stage; and

    receiving means implanted in user'"'"'s body, said receiving means including a single high frequency input channel and a plurality of excitation electrodes responsive to different frequencies of the received signal.

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