H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/23, 379/5, 3
H04M 1/515 (2006.01) B21D 31/04 (2006.01) B21D 49/00 (2006.01) B29C 70/26 (2006.01) E04C 5/06 (2006.01) H04M 11/06 (2006.01)
Patent
CA 1122735
ABSTRACT OF THE DISCLOSURE: A keyboard type telephone station connected to a telephone subscriber's line comprises a dial pulse train generator and a dialling multifrequency signal generator. The telephone station includes detecting means which comprises at least one threshold detector for the power level of supervisory or so-called tone signals. Each supervisory signal is transmitted from the linking exchange on the telephone subscriber's line and indicates the beginning of a dialling phase in setting up a telephone communication. In response to the detection of the supervisory signal, the detecting means controls means for blocking transmission of the pulse generator and for releasing transmission of the multifrequency generator, so that only the multifrequency generator transmits only the dialling multifrequency signal associated with the first key of the dialling phase. Then the detecting means controls automatically the blocking and releasing means such that only the pulse generator transmits the dial pulse trains associated with said first key and with the subsequent keys of the dialling phase in response to further detection of the supervisory signal, or such that only the multifrequency generator transmits the dialling multifrequency signals associated only with the said subsequent keys in response to the non-detection of the supervisory signal.
322935
Robic Robic & Associes/associates
Roche Bernard G.
LandOfFree
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