Apparatus for discriminating information signals from noise sign

Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system

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Details

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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