Digital tone signal generator for telephony system

Details Digital tone signal generator for telephony system Digital tone signal generator for telephony system

1983-12-02

1986-02-11

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

H04J 312

Patent

active

045702608

ABSTRACT:
A digital tone signal generator for generating digital tone words of selected frequencies and selected cadences in a predetermined number of sequential time slots for use by a telephony system. The generator stores signals representative of each of the frequencies and, in response to a timing signal from the telephony system, generates update signals representative of the amplitudes of the tones at the time the timing signal is received. The cadence is applied to the amplitude signals to obtain the output digital tone word.

REFERENCES:
patent: 3985965 (1976-10-01), Field et al.
patent: 4171466 (1979-10-01), Carbrey
patent: 4390983 (1983-06-01), Duplessis et al.
patent: 4399535 (1983-08-01), Southard

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