Hearing aid operative to cancel sounds propagating through the hearing aid case
OwnerGeorge Jay Lichtblauinventor
Life of this patent
Estimating the term…
Abstract
Apparatus for use in a hearing aid wherein a first microphone is connected to the hearing aid case and exposed to free air and a second microphone is connected to the hearing aid case and sealed from free air. The audio inputs from the two microphones are applied to a subtractive circuit so as to cancel any audio signals transmitted through the case of the hearing aid while passing audio signals received by the microphone exposed to free air.
Claims57
A hearing aid comprising:
- a hearing aid case configured to be worn by a person;
- a first microphone fixed to the hearing aid case and exposed to sound originating in free air and sound propagating through the hearing aid case;
- a second microphone fixed to the hearing aid case and sealed from sound propagating through air and exposed to sound propagating through the hearing aid case;
- subtractive circuitry operative to receive electrical outputs from the first microphone and the second microphone and to subtract one of the electrical outputs from the other of the electrical outputs to produce a resulting electrical signal in which audio signals which are propagated thorough the hearing aid case are minimized and audio signals received through the air are passed;
- and
- a transducer element operative to change the resulting electrical signal into an audio signal.
The hearing aid claim of 16, wherein the transducer element operative to change the resulting electrical signal into an audio signal is electrically connected to the subtractive circuitry by a pair of twisted wires.
A hearing aid comprising:
- a hearing aid case configured to be worn by a person;
- a first microphone fixed to the hearing aid case and exposed to sound propagating through free air and sound propagating through the hearing aid case;
- a second microphone fixed to the hearing aid case and sealed from sound propagating through air and exposed to sound propagating through the hearing aid case;
- subtractive means for receiving electrical outputs from the first microphone and the second microphone and subtracting one of the electrical outputs from the other of the electrical outputs to produce a resulting electrical signal representative of audio signals transmitted through air;
- and
- a transducer element operative to change the resulting electrical signal into an audio signal.
Dependencies are inferred from the claim text.