Circuit arrangement for signal-pause detection

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude

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327 80, 327 81, 327 87, 327 61, H03K 5153, H03K 3017

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active

058670440

ABSTRACT:
A circuit arrangement is disclosed which detects a signal pauses in an audio signal, The audio signal is amplified, rectified, and then sent to a control unit. The control unit periodically sets the output of the rectifier to a predetermined level below a threshold level. The control unit then waits a predetermined period of time and determines whether the signal at the output of the rectifier has exceeded the threshold. If is does not, a signal pause has occurred.

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patent: 5120995 (1992-06-01), Abdi
Data Sheet--TEA0675, Dual Dolby B-Type Noise Reduction Circuit for Playback Applications, Philips Semiconductors, Oct. 1992.
Manfred Riedel, "Suchen Und Finden", Funkschau 1977, Heft 24, Bd. 49, Nr. 24, Nov. 1977, Munchen, 1121-1123.
Anonymous: IBM Techinical Disclosure Bulletin, Bd. 20, Nr. 12, May 1978, New York, US. 5437-5440, "Amplitude Detection Method for Producing Rate Controlled Speech".

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