Transmission circuit for a DTMF-telephone set

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

1984-03-28

1986-04-29

Dwyer, James L.

H04M 126

Patent

active

045859094

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 frequencies 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.

REFERENCES:
patent: 3832639 (1974-08-01), Janssen

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