×

Hearing aid and system for use with cellular telephones

  • US 5,768,397 A
  • Filed: 08/22/1996
  • Issued: 06/16/1998
  • Est. Priority Date: 08/22/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A hearing aid for use with a light-emitting diode (LED)-equipped cellular telephone, comprising:

  • a microphone;

    a receiver;

    a hearing aid circuit operatively connected to the microphone and receiver;

    a photodiode;

    an audio-frequency demodulator;

    a bandpass filter connected in series between the photodiode and the demodulator; and

    switch means having a first state and a second state, the switch means causing the receiver to be operatively responsive to signals from the demodulator when in the first state and causing the receiver to be operatively responsive to signals from the microphone when in the second states.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×