Telephone signal classification and phone message delivery metho

Details Telephone signal classification and phone message delivery metho Telephone signal classification and phone message delivery metho

1993-06-22

1994-05-10

Dwyer, James L.

Telephonic communications

Audio message storage, retrieval, or synthesis

Multilingual system or operation

379 80, 379351, 379377, 379386, 381 42, H04M 164, H04M 322, G10L 500

Patent

active

053115759

ABSTRACT:
A method of processing a signal having characteristics and received from a telephone line is presented. The method includes defining a frame by measuring a plurality of samples from the signal over a predetermined period. Additionally, linear prediction coding coefficients of a selected group from the plurality of samples are determined. Further, the variance of the linear prediction coding coefficients are determined and the variances compared to a reference variance. A heuristic rule is applied to a selected characteristic of the signal to determine if the signal comprises a voice signal.

REFERENCES:
patent: 3873772 (1975-03-01), Dumler
patent: 4032711 (1977-06-01), Sambur
patent: 4689760 (1987-08-01), Lee et al.
patent: 4809321 (1989-02-01), Morganstein et al.
patent: 5054083 (1991-10-01), Naik et al.

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