Speech detector with improved line-fault immunity

Details Speech detector with improved line-fault immunity Speech detector with improved line-fault immunity

1990-06-27

1992-10-27

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 47, G10L 500

Patent

active

051596385

ABSTRACT:
A speech detector has an intensity detector that indicates whether the intensity of a PCM signal exceeds a first threshold, and a normal-zero-crossing-count detector that indicates whether the zero-crossing count of the PCM signal exceeds a second threshold. The outputs of the intensity detector and normal-zero-crossing-count detector are combined by AND logic to produce the output of the speech detector. The second threshold is set well below the minimum zero-crossing count occurring in normal speech, the function of the normal-zero-crossing-count detector being to disable speech detection during line faults.

REFERENCES:
patent: 3712959 (1973-01-01), Fariello
patent: 3985956 (1976-10-01), Monti et al.
patent: 4001505 (1977-01-01), Araseki et al.
patent: 4061878 (1977-12-01), Adoul et al.
Casale, et al, IEEE Global Telecommunications Conference and Exhibition, Hollywood, FL, "A DSP implemented . . . discriminator" Nov. 28-Dec. 1, 1988, vol. 3, pp. 1419-1427.
"A Highly Sensitive Speech Detector and High-Speed Voiceband Data Discriminator in DSI-ADPCM Systems" Y. Yatsuzuka, IEEE Transactions on Communications, vol. COM-30, No. 4, Apr. 1982.
"Pattern Recognition Approach to Voiced-Unvoiced-Silence Classification with Applications to Speech Recognition." B. S. Atal and L. R. Rabiner, IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-24, No. 3, Jun. 1976.

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