Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1987-05-21
1990-04-17
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 300
Patent
active
049187341
ABSTRACT:
A speech coding system includes apparatus for generating a variable threshold dependent upon the power of an input speech signal, and a comparator for comparing the power of the input speech signal with the variable threshold value to generate a discriminating signal for discriminating between a period when a speech continues and a period when the speech pauses, to change the coding operation for the input speech signal in accordance with the level of the discriminating signal, thereby forming voiced and unvoiced frames independently of each other.
REFERENCES:
patent: 4219695 (1980-08-01), Wilkes et al.
patent: 4301329 (1981-11-01), Taguchi
patent: 4351983 (1982-09-01), Crouse et al.
patent: 4359604 (1982-11-01), Dumont
patent: 4449190 (1984-05-01), Flanagan et al.
patent: 4700394 (1987-10-01), Selbach et al.
Atal et al., "A New Model of LPC Excitation for Producing Natural Sounding Speech at Low Bit Rates", IEEE ICASSP 1982, pp. 614-617.
Ichifana et al., "A Speech Coding Method Using Thinned-out Residual", IEEE ICASSP 85, pp. 961-964.
Itakupa et al., "An Audio Response Unit Based on Partial Autocorrelation", IEEE Trans. Comm., vol. COM--20, No. 4, 8/72, pp. 792-797.
Kondo Kazuhiro
Miyamoto Takanori
Muramatsu Ryujiro
Suzuki Toshiro
Harkcom Gary V.
Hitachi , Ltd.
Merecki John A.
LandOfFree
Speech coding system using variable threshold values for noise r does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Speech coding system using variable threshold values for noise r, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speech coding system using variable threshold values for noise r will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1058467