Automatic gain control in a digital signal processor
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United States of America Patent
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May 24, 1988
Grant Date -
N/A
app pub date -
Oct 11, 1985
filing date -
Oct 11, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Automatic gain control (AGC) is provided in a digital signal processor environment. A predetermined threshold value, a predetermined automatic gain control value, and a predetermined count threshold value are established and stored in a data memory associated with a signal processor. Each incoming signal sample that is received is multiplied by the AGC value with the product being temporarily stored in the data memory. The absolute value of the resulting product is taken and added to the predetermined threshold value. If the result of this operation results in a signal processor overflow, then the AGC value is reduced and stored back into the data memory. The adjustment period of the AGC value is chosen to be well under the allowable distortion time for speech, dual tone multi-frequency reception, and modem operation.
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