Time dependant, variable amplitude threshold output circuit for frequency variant and frequency invarient signal discrimination
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United States of America Patent
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-
Dec 3, 1991
Issued Date -
N/A
app pub date -
Mar 12, 1990
filing date -
Mar 2, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An audio compression system wherein the compression theshold may be adjusted to a calibrated level. The audio compression system is utilizable in a receiver system whereinan audio input signal received by the receiver system via a communications channel is applied to conditioning circuitry. The conditioning circuitry, in turn, provides a conditioned input signal to an acoustic transducer element for generating a corresponding audio output signal. The audio compression system compares the conditioned input signal and an initial threshold signal to provide a comparator output signal corresponding to the difference between the conditoned input signal and the initial threshold signal. The comparator output signal is provided as a control input to the conditioning circuitry. If the conditioned input signal exceeds the initial threshold signal for a preselected period of time, then the initial threshold signal is switched to a second threshold signal.
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