Voice activity detector

Details Voice activity detector Voice activity detector

1998-04-30

2000-05-09

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704214, 704227, 704233, G10L 1100, G10L 1904

Patent

active

060616474

ABSTRACT:
Speech is distinguished from noise by a spectral comparison of an input signal with a stored noise estimate. Updating of the noise estimate stored in a buffer is permitted during periods when speech is absent under control of an auxiliary detector. In order to improve operation in the presence of signals with strong harmonic components, e.g., signaling tones, an LPC prediction gain is computed from the input (x(i)) and a residual (y(i)) obtained from the input following filtering by a filter having a response complementary to the frequency spectrum of the input, and if the gain exceeds a threshold, buffer updating is suppressed.

REFERENCES:
patent: 4227046 (1980-10-01), Nakajima et al.
patent: 4283601 (1981-08-01), Nakajima et al.
patent: 4358738 (1982-11-01), Kahn
patent: 4672669 (1987-06-01), DesBlache
patent: 4688256 (1987-08-01), Yasunaga et al.
patent: 4696039 (1987-09-01), Doddington
patent: 4700392 (1987-10-01), Kato et al.
patent: 4731846 (1988-03-01), Secrest et al.
patent: 4918734 (1990-04-01), Muramatsu et al.
patent: 5103481 (1992-04-01), Iseda et al.
patent: 5276765 (1994-01-01), Freeman et al.
patent: 5659622 (1997-08-01), Ashley
patent: 5680508 (1997-10-01), Liu
patent: 5749067 (1998-05-01), Barrett
Atal et al, "A Pattern Recognition Approach to Voice-Unvoiced-Silence Classification with Applications to speech Recognition" IEEE Transactions On Acoustics, Speech, And Signal Processing, vol. ASSP-24, No. 3, Jun. 1976, pp. 201-202.
Rabiner et al, "Evaluation of a Statistical Approach to Voiced-Silence Analysis for Telephone-Quality Speech", The Bell System Technical Journal, vol. 56, No. 3, Mar. 1997, pp. 455-481.
Johnson et al, "Speech Detector" IBM Technical Disclosure Bulletin, vol. 22, No. 7, Dec. 1979, pp. 2624-2625.
Drago et al, Digital Dynamic Speech Detectors; IEEE Transactions On Communications, vol. COM-26, No. 1, Jan. 1978, pp. 140-145.
Rabiner et al, "Application of an LPC Distance Measure to the Voiced-Invoiced-Silence Detection Problem", IEEE Transaction On Acoustics, Speech, And Signal Processing, vol. ASSP-25, No. 4, Aug. 1977, pp. 338-343.
McAulay, "Optimum Speech Classification and Its Application to Adaptive Noise Cancellation", M.I.T. Lincoln Lab, Lexington, Massachusetts, pp. 425-426.
Un et al, "Improving LPC Analysis of Noisy Speech By Autocorrelation Subtraction Method", Department of Electrical Science Korea Advanced Institute of Science, Seoul Korea Central Research Lab., pp. 1082-1083.
ICASSP 81 Proceedings, Mar. 30, 31, Apr. 1981, Sheraton Atlanta Hotel, Atlanta, Ga. pp. 1082-1083.
1977 IEEE International Conference on Acoustics, Speech & Signal Porcessing, Held at the Sheraton-Hartford Hotel, Hartford Connecticut, May 9-11, 1997, pp. 427-428.

Affiliated with

Also associated with

Rating

Voice activity detector 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 activity detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voice activity detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1074533