Voiceband signal classification

Details Voiceband signal classification Voiceband signal classification

1986-11-06

1989-03-21

Salce, Patrick R.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 46, 3645135, 379351, 341143, G10L 506

Patent

active

048151360

ABSTRACT:
A signal is classified as one among a plurality of classifications by employing the autocorrelation of a complex low-pass version of the signal, i.e., the complex autocorrelation. The normalized magnitude of the complex autocorrelation obtained at a prescribed delay interval, i.e., "lag", is compared to predetermined threshold values to classify the signal as having one of a plurality of baud rates.

REFERENCES:
patent: 4281218 (1981-07-01), Chuang et al.
patent: 4297533 (1981-10-01), Gander et al.
"Visual Pattern Recognition by Moment Invariants", M. K. Hu, IRE Transactions on Information Theory, Feb. 1962, pp. 179-187.
IEEE Transactions on Communications, vol. COM-30, No. 4, Apr. 1982--Highly Sensitive Speech Detector and High-Speed Voiceband Data Discriminator in DSI-ADPCM Systems by Yohtaro Yatsuzuka.
IBM Technical Disclosure Bulletin vol. 26 No. 1, Jun. 1983--Voice/Data Detector and Discriminator for Use in Transform Speech Coders by D. R. Irvin.

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