Multiple use digital tone generator in telephone

Details Multiple use digital tone generator in telephone Multiple use digital tone generator in telephone

1984-10-22

1986-02-18

Dwyer, James L.

179 84R, 179 81R, 179 84VF, H04M 150

Patent

active

045714622

ABSTRACT:
Electronic telephone set having DTMF tone dialling. By some slight additions to the logic circuits of the digital DTMF tone generator this tone generator is made suitable for generating a two-tone ringing signal, for supervising the frequency of the incoming ringing voltage and for generating a tone interval of approximately 0.1 s for the call-back function.

REFERENCES:
patent: 4070551 (1978-01-01), Weir
patent: 4503288 (1985-03-01), Kessler
W. David Pace, "LSI for Telecommunications-A One Chip Telephone", Telecommunications, Apr. 1984.

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