Cycle-modulating type of dual-tone multifrequency generator

Details Cycle-modulating type of dual-tone multifrequency generator Cycle-modulating type of dual-tone multifrequency generator

1996-09-20

1999-01-12

Hong, Harry S.

Telephonic communications

Supervisory or control line signaling

Substation originated

379350, 379357, 379353, 341147, H04M 100, H04M 300, H03M 166

Patent

active

058599053

ABSTRACT:
A cycle-modulating DTMF generator for generating a DTMF signal; the generator comprises a programmable time-pulse generator, counters or up/down counters, a memory unit for storing data, a digital adder, and a digital-to-analog converter. The circuit of such generator is substantially a digital circuit so as to overcome the problem of signal distortion, which usually exists in an analog circuit.

REFERENCES:
patent: 4068178 (1978-01-01), Tunzi
patent: 4998276 (1991-03-01), Hasegawa
patent: 5027389 (1991-06-01), Chiue et al.
patent: 5034977 (1991-07-01), Chen et al.
patent: 5714954 (1998-02-01), Chung et al.

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