Signal analyzing system

Details Signal analyzing system Signal analyzing system

1990-08-08

1991-12-03

Schreyer, Stafford D.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379377, 379386, H04M 164

Patent

active

050705261

ABSTRACT:
An analog communication signal such as the signal transmitted over a telephone line is converted to digital form for storage in the memory of a computer. Segments of the digital representation of the signal are analyzed to determine whether or not the signal has uniform frequency components repeating at regular intervals. Detection of such regularly repeating uniform frequency components is useful in an automated telephone system to determine whether a telephone signal consists of voice or a call progress signal.

REFERENCES:
patent: 4160125 (1979-07-01), Bower et al.
patent: 4201896 (1980-05-01), Bower et al.
patent: 4356348 (1982-10-01), Smith
patent: 4405833 (1983-09-01), Cave et al.
patent: 4439639 (1984-03-01), Munter
patent: 4477698 (1984-10-01), Szlam et al.
patent: 4696031 (1987-09-01), Freudberg

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