1991-05-28
1994-03-08
Knepper, David D.
395 242, G10L 302
Patent
active
052934500
ABSTRACT:
A voice signal coding system includes a voice signal detector for receiving a mixed signal of an intermittent voice signal and background noise signal and for detecting the presence and absence of the voice signal contained in the mixed signal. A voice signal period detector is provided for detecting a voice signal period in which the voice signal is present. A coding period control circuit is coupled to the voice signal period detector for producing a coding period control signal during the voice signal period. A coding circuit receives and encodes the mixed signal in response to the coding period control signal. Thus, the mixed signal is coded in the coding circuit only during the voice signal periods.
REFERENCES:
patent: 4053712 (1977-10-01), Reindl
patent: 4630304 (1986-12-01), Borth et al.
patent: 4696039 (1987-09-01), Doddington
patent: 4696040 (1987-09-01), Doddington et al.
patent: 4918734 (1990-04-01), Muramatsu et al.
patent: 4920568 (1990-04-01), Kamiya et al.
McAulay, "Optimum Speech Classification and Its Application to Adaptive Noise Cancellation," IEEE ICASSP, Hartford, Conn., May 1977, pp. 425-427.
Boll, "Suppression of Acoustic Noise in Speech Using Spectral Subtraction", IEEE Trans on ASSP, vol. 27, No. 2, Apr. 1979, pp. 113-120.
Conway et al., "Adaptive Processing with Feature Extraction to Enhance the Intelligibility of noise-Corrupted Speech," International Conf. on Industrial Electronics, Control, and Instrumentation, Nov. 1987, pp. 1-6.
"Cepstrum Pitch Determination", A. Michael Noll, The Journal of the Acoustical Society of America, pp. 293-309.
"Quality Improvement of Synthesized Speech in Noisy Speech Analysis-Synthesis Processing", Hiromi Nagabuchi et al., 433 Electronics & Communications in Japan vol. 64-A, No. 9, 1981.
Kane Joji
Nohara Akira
Knepper David D.
Matsushita Electric - Industrial Co., Ltd.
LandOfFree
Voice signal coding system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voice signal coding system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voice signal coding system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-159241