Dtmf-telephone set with multiple use of the logic of the...

Details Dtmf-telephone set with multiple use of the logic of the... Dtmf-telephone set with multiple use of the logic of the...

H - Electricity

04

M

379/23

H04M 1/50 (2006.01) H04M 1/53 (2006.01) H04M 19/04 (2006.01)

Patent

CA 1224293

ABSTRACT: "DTMF-telephone set with multiple use of the logic of the digital tone generator". 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. Fig. 3.

466175

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