Intelligent automatic threshold circuit
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United States of America Patent
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-
Nov 16, 1993
Grant Date -
N/A
app pub date -
Mar 10, 1992
filing date -
Mar 10, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A circuit for conditioning an input signal containing audio and noise components is provided in which a first circuit branch is used for deriving a first DC signal proportionate to the decibel level of high band information in the input signal and a second circuit branch is used for deriving a second DC signal proportionate to the amplitude of the input signal. A preselected maximum threshold reference is provided when the second DC signal drops below a preselected threshold and also for a predetermined time period when the second DC signal rises above the preselected threshold. The first DC signal and the maximum threshold reference are used to provide a peak detector signal input which is maintained at a level equal to the most negative level of the first DC signal when the maximum threshold reference is not provided and at a level equal to the most positive level of the first DC signal but not greater than the preselected maximum threshold reference when the maximum threshold reference is provided.
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