Classification of audio signals on a telephone line

Details Classification of audio signals on a telephone line Classification of audio signals on a telephone line

1989-06-28

1991-04-09

Kemeny, Emanuel S.

Boots, shoes, and leggings

381 46, 379 34, G01L 500

Patent

active

050070002

ABSTRACT:
This telephone solicitation system provides automatic dialing and call-progress detection. Audio signals on the line are analyzed to recognize network operation tones, noise bursts, and speech. A "sample" is the total number of crossings during a 25 millisecond period. A "window" is a sequence of eight samples analyzed for spectral and time patterns.

REFERENCES:
patent: 4027102 (1977-05-01), Ando
patent: 4405833 (1983-09-01), Cave et al.
patent: 4477698 (1984-10-01), Szlam
patent: 4540855 (1985-09-01), Szlam
patent: 4542525 (1985-09-01), Hopf

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