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Voiced Sound Detector

IP.com Disclosure Number: IPCOM000097275D
Original Publication Date: 1962-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Dersch, WC: AUTHOR

Abstract

This circuitry distinguishes human speech from mechanically generated noise, distinguishes voiced sounds from unvoiced sounds and segregates various voiced sounds. Use is made of the asymmetry which invariably exists between components of opposite polarities in voiced sounds.

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Voiced Sound Detector

This circuitry distinguishes human speech from mechanically generated noise, distinguishes voiced sounds from unvoiced sounds and segregates various voiced sounds. Use is made of the asymmetry which invariably exists between components of opposite polarities in voiced sounds.

The complex wave of the incoming signals 10 is split 12 into positive going and negative going cyclic components, e.g., by a pair of parallel coupled oppositely poled diodes. The two components of opposite polarity are integrated in separate circuits 14 and 15 over a typical syllabic speech interval and are subtracted from one another 17. An output of the following threshold circuit 19 is an indication of a voiced sound.

To facilitate the discrimination of different voiced sounds, the interposition of a phase shifter between 10 and 12 is effected.

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