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Speech Analyzing Circuitry

IP.com Disclosure Number: IPCOM000096825D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Nassimbene, EG: AUTHOR

Abstract

The circuits analyze speech to secure information useful in segregating the various phonetic sounds.

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Speech Analyzing Circuitry

The circuits analyze speech to secure information useful in segregating the various phonetic sounds.

The vocal chords create a series of pulses called glottal pulses. Each resonates in the mouth and nasal cavities to provide a damped transient oscillation of sound waves. The resultant waveform of each series of sound waves created by a glottal pulse differs for each of the various voiced phonetic sounds. Each such series of sound waves created by a glottal pulse is called a vocal clap.

The circuit (upper drawing) counts the number of positive-going, zero-axis crossings of the received sound waves within each vocal clap of a received voice signal. This circuit has positive-going, zero-axis crossing detector 10, counter 11 and glottal pulse detector 12. Detector 10 provides an output pulse whenever the voiced signal crosses the zero axis in a positive-going direction and transmits output pulses to counter 11. Detector 12 provides an output pulse at the beginning of each vocal clap. This output is used to reset the counter, which then provides an output indicative of the count reached. Thus, the counter provides the count of the number of the positive-going, zero crossings for each vocal clap.

The circuit in the lower drawing measures the time required for the first three positive-going, zero-axis crossings of each vocal clap in a voiced sound wave. Timing device 13 provides a digital output representative of the time between the receipt o...