Hearing aid having plural microphones and a microphone switching system

  • US 6,101,258 A
  • Filed: 10/21/1997
  • Issued: 08/08/2000
  • Est. Priority Date: 04/13/1993
  • Status: Expired due to Term
First Claim
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1. A hearing aid apparatus comprising:

  • an omnidirectional microphone for converting sound waves to electrical signals;

    a directional microphone of at least the first order for converting sound waves into electrical signals, said electrical signals of said directional microphone having low, mid, and high frequency components, said low frequency components of said electrical signals of said directional microphone having a lower amplitude than said mid and high frequency components of said electrical signals of said directional microphone;

    an equalization amplifier accepting said electrical signals from said directional microphone for at least partially equalizing said amplitude of said low frequency electrical signal components of said electrical signals of said directional microphone with said amplitude of said mid and high frequency electrical signal components of said electrical signals of said directional microphone, said equalization amplifier having an equalized electrical signal output;

    a hearing aid amplifier for amplifying electrical signals received at an input thereof, andswitch means for switching between first and second switching states, said switch means connecting said electrical signal from said omnidirectional microphone to said input of said hearing aid amplifier when said switch means is in said first switching state, said switch means connecting said equalized electrical signal from said equalization amplifier to said input of said hearing aid amplifier when said switching means is in said second switching state.

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