Adjustable-period dual-tone multifrequency generator

Details Adjustable-period dual-tone multifrequency generator Adjustable-period dual-tone multifrequency generator

1996-09-03

1999-03-30

Tsang, Fan S.

Telephonic communications

Supervisory or control line signaling

Substation originated

379362, 379418, 364721, H04M 100

Patent

active

058898530

ABSTRACT:
An adjustable-period dual-tone multifrequency (DTMF) generator, which includes a plurality of programmable counters or up/down counters, a control unit, a memory unit for storing data, a digital adder, and a digital-to-analog converter. The programmable counter and the control unit are combined together to form into at least two programmable counting address generators, in which the circuit is a digit-process circuit for overcoming the problem of signal distortion that usually exists in an analog circuit.

REFERENCES:
patent: 4110567 (1978-08-01), Boucher
patent: 4132871 (1979-01-01), Lake
patent: 4639554 (1987-01-01), Masuda et al.
patent: 4727570 (1988-02-01), Tarbouriech
patent: 4998276 (1991-03-01), Hasegawa
patent: 5034977 (1991-07-01), Chen et al.
patent: 5475627 (1995-12-01), Inoue

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