Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-09-27
1992-07-28
Shaw, Dale M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381110, 381121, H04B 1500, G10L 906
Patent
active
051346583
ABSTRACT:
The preferred embodiment of the apparatus comprises a first signal level detector which receives the communications signal as an input and generates a detection signal as an output, a second signal level detector which receives the detection signal as an input and generates a noise detection signal as an output, and a comparing circuit which compares the detection signal and the noise detection signal and produces a speech burst detection signal. Each of the signal level detectors comprises a digital low pass filter having an input and an output which employs a comparator for comparing current samples of signals at the input with previous samples of signals at the output and generating a representative comparator output. Each low pass filter includes circuitry for establishing an attack time and a decay time, in response to the comparator output. The attack time and the decay time in the first signal level detector being established as a fast attack time and a slow decay time relative to the attack time and the decay time in the second signal level detector.
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Chen Herbert M.
Hendrickson Alan F.
Advanced Micro Devices , Inc.
Knepper David D.
Shaw Dale M.
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