Digital tone detector

Details Digital tone detector Digital tone detector

1985-02-26

1987-05-26

Dwyer, James L.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379231, 379234, H04M 300

Patent

active

046691146

ABSTRACT:
A digital progress tone detector, for connection to a telephone line and a PABX, comprising circuitry for generating one or more reference tones having user definable frequencies and performing single frequency discrete Fourier transforms on one or more signals received from the telephone line at the defined frequencies, and providing an output signal to the PABX in response thereto. The output signal provides an indication of whether or not a predetermined one or more progress tone frequencies have been detected in the received signals. Because the generated reference tone frequencies are user definable, the present invention can be easily adapted for use in various foreign countries having different progress tone frequency requirements. A preferred embodiment of the invention is implemented on a single microcomputer chip in conjunction with peripherals (such as codecs, crosspoint switches, etc.). The progress tone detector is simple, small and inexpensive, thus conforming to the miniaturization and cost efficiency requirements of modern day PABX circuits.

REFERENCES:
patent: 3863030 (1975-01-01), Mills
patent: 4403298 (1983-09-01), May, Jr.

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