Class D hearing aid amplifier

Details Class D hearing aid amplifier Class D hearing aid amplifier

1986-03-19

1987-08-25

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 684, 381 686, 330251, H04R 300

Patent

active

046898190

ABSTRACT:
A sub-miniature power amplifier for hearing aids configured to be completely self-contained and to fit within the user's ear features a Class D amplifier stage providing a peak-to-peak output voltage greater than the power supply voltage. By configuring all signal elements as digital units, circuit balance is readily maintained. A substantial economy of battery drain is achieved while preserving a low value of distortion at low signal levels. Oscillator frequency is governed by a single resistance element. The amplifier and an optional efficiency-improving inductor can be accommodated entirely within the residual volume of the motor chamber of a state-of-the-art earphone housing. Pulse feedback networks are provided to achieve positive stable latching of each output pulse throughout its duration without producing significant pulse duration distortions.

REFERENCES:
patent: 3995114 (1976-11-01), Marschinke
patent: 4068090 (1978-01-01), Komatsu
patent: 4471490 (1984-09-01), Bellafiore
patent: 4592087 (1986-05-01), Killion

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