Class D hearing aid amplifier
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United States of America Patent
Stats
-
May 27, 1986
Grant Date -
N/A
app pub date -
Dec 8, 1983
filing date -
Dec 8, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A subminiature power amplifier for hearing aids configured to be completely self-contained and fit within the user's ear features a Class D amplifier stage. 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.
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