Transmission circuit for a dtmf-telephone set

Details Transmission circuit for a dtmf-telephone set Transmission circuit for a dtmf-telephone set

H - Electricity

04

M

379/20

H04M 1/50 (2006.01)

Patent

CA 1210540

PHN. 10.658 10 ABSTRACT: Transmission circuit for a telephone set for DTMF-tone selection. The required second-order tone filter is formed by arranging the speech filter (12) during the dialling procedure in series with a fixed first-order tone filter (10) by means of a switch (11). The resultant attenuation of the group II of high fre- quencies of the dialling tones is compensated for by increasing the amplitude of the dialling tones of the high-frequency group II and by an additional increase in the sub-group II(2) of the two highest frequencies of this group.

451792

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