Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-01-19
1989-08-29
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 710
Patent
active
048625035
ABSTRACT:
A technique for extracting voice parameters from oral or combined oral and nasal air flow involves having a test subject or patient pronounce a vowel sound that has a high first formant into a pneumotachographic device which produces an output voiced speech waveform that includes the mean air flow. This output signal is appropriately filtered to remove the formant frequencies and produce a smoothed glottal waveform approximation. From the pneumotachograph output waveform and smoothed glottal waveform are derived a peak value P, a minimum value L, glottal wave period T.sub.O and average value M for the glottal waveform. The amplitude and wave center value can readily be calculated, and from these the open quotient Q.sub.O can be derived which represents the ratio of the duration of the open portion B of the glottal wave cycle to the entire period T.sub.O thereof. These values can be recorded directly, or can be used to synthesize a replica of the subject's glottal airflow for either one typical vocal fold vibratory cycle or a number of successive cycles. The technique can be carried out using digital techniques.
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Harkcom Gary V.
Merecki John A.
Syracuse University
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