Electrical audio signal processing systems and devices – With amplifier
Patent
1995-06-07
1998-04-28
Isen, Forester W.
Electrical audio signal processing systems and devices
With amplifier
381 96, 330263, 330265, 330267, H03F 2100, H04R 300
Patent
active
057455872
ABSTRACT:
An electroacoustic device such as a hearing aid having a battery, microphone, speaker, a preamplifier, a voltage regulator and power amplifier. The power amplifier includes identically configured output and bridge stages connected to opposite sides of the speaker, the output signals from the output stage being connected through a blocking capacitor to the input of the bridge stage. The output/bridge stage circuit includes an interface stage and two current gain stages. The interface stage converts voltage signals to current signals with a pair of outputs respectively connected to the two like-configured current gain stages. Each current gain stage includes two successive sections, each having a pair of transistors, one of which is configured as a diode connected in series with a resistor to shunt current from the base of the other transistor. The current output of the current gain stages is thus responsive to the input current level, permitting low quiescent current with efficient delivery of current to the receiver, and providing high peak currents with minimum distortion. Also, quiescent current is essentially insensitive to variations in battery voltage and temperature.
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Scheller Thomas A.
Statz Timothy V.
Bausch & Lomb Incorporated
Isen Forester W.
Larson Craig E.
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