Tone-type recognition method

Details Tone-type recognition method Tone-type recognition method

1989-08-23

1991-11-05

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Signal receiver

379372, 379377, H04M 100

Patent

active

050635930

ABSTRACT:
There is disclosed a tone type recognition method capable of recognizing a call progress state of a central office line switching system by using a tone detector. The method enables the system to correctly recognize the type of call progress tone, regardless of its frequency, by conducting periodic detection of characteristics of cadence classified by tone-type.

REFERENCES:
patent: 3270143 (1966-08-01), Germond et al.
patent: 4405833 (1983-09-01), Cave et al.
patent: 4439639 (1984-03-01), Munter
patent: 4528664 (1985-07-01), Cheng et al.
patent: 4686699 (1987-08-01), Wilkie
patent: 4696031 (1987-09-01), Freudberg et al.

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