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Speech Recognition Voicing Detector

IP.com Disclosure Number: IPCOM000095561D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Comer, DT: AUTHOR [+2]

Abstract

The voicing detector circuit produces an output whenever a voiced sound is detected. The detector operates by periodically sampling the zero axis crossing rate of the complex voice waveform and provides an out put if a certain minimum rate is detected.

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Speech Recognition Voicing Detector

The voicing detector circuit produces an output whenever a voiced sound is detected. The detector operates by periodically sampling the zero axis crossing rate of the complex voice waveform and provides an out put if a certain minimum rate is detected.

Low pass filter 15 attenuates friction and other high frequency sound. The resultant waveform is supplied to zero-axis crossing detector 16. Detector 16 produces a pulse for each axis crossing, which pulse is applied through And 17 to counter 18. The other input to And 17 is derived from clock 19 which periodically opens gate 17 for fixed intervals.

Another output of clock 19 operates And 20 to sample the last stage of counter 18 after And 17 has been closed. If the last stage indicates a count, the output operates monostable multivibrator 21. The output of multivibrator 21 is then applied to integrating level detector 22. If multivibrator 21 is triggered at a preselected rate, detector 22 produces an output Signal to indicate that a voicing signal has been detected.

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