Radio receiver speech amplifier circuit
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United States of America Patent
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-
Jan 26, 1988
Grant Date -
N/A
app pub date -
Jan 7, 1987
filing date -
Jan 7, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A speech amplifier circuit increases the maximum perceived loudness at the speaker (412) and reduces distortion at high volume levels without increasing the power consumed by the speech powder amplifier (410). When a low volume is selected by the volume control (414), the microcomputer (418) sets the step attenuator (406) at a correspondingly high attenuation level and the high-pass filter (408) is bypassed. As the volume control (414) is advanced and the speech power amplifier (410) is 12 dB into clipping, the microcomputer (418) activates the high-pass filter (408) and simultaneously steps the gain of the step attenuator (406) by 6 dB.
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