Hearing aid

Details Hearing aid Hearing aid

1976-07-01

1978-01-10

Stellar, George G.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

179107R, 330277, 330307, H04R 300, H04R 2500, H03F 316

Patent

active

040680908

ABSTRACT:
An improved hearing aid utilizing integrated field-effect transistors to reduce the size and power consumption thereof is provided. The hearing aid includes a microphone input device for producing signals representative of sound, an amplifier circuit for amplifying the signals produced by microphone input device, and a loudspeaker output device for producing sound representative of the sound sensed by the microphone input device at an amplified level. The invention is particularly characterized by a portion of at least the microphone input device, amplifier circuit and/or microphone output device being formed of MOS field-effect transistors.

REFERENCES:
patent: 3624315 (1971-11-01), Broce et al.
patent: 3728496 (1973-04-01), Page
patent: 3862367 (1975-01-01), Kono et al.

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