Sound signal output circuit and method
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United States of America Patent
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Jan 6, 1998
Grant Date -
N/A
app pub date -
Aug 26, 1994
filing date -
Aug 31, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A sound signal output circuit and method which controls the volume every time a new signal source is selected which has a different modulation degree, than the previous signal source and which prevents sound distortion caused by an over-modulated sound signal input. The circuit detects the peak value of the selected sound signal source, stores the detected peak value, compares the stored peak level with the detected peak level, and thereby selects the greater peak level. Next, the circuit applies the selected peak level to a gain control amplifier as a gain control value, so that when the sound signal source having a different modulation degree is selected, the volume can be automatically controlled.
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