Circuit arrangement for a digital multifrequency-signal...

Details Circuit arrangement for a digital multifrequency-signal... Circuit arrangement for a digital multifrequency-signal...

H - Electricity

04

M

328/164, 379/21,

H04M 1/50 (2006.01) H04Q 1/457 (2006.01) H04Q 1/46 (2006.01)

Patent

CA 1078980

Circuit Arrangement for a Digital Multifrequency-Signal Receiver Abstract of the Disclosure In a digital voice-frequency receiver, upon detection of a disturbance in one frequency group, the associated counter is reset and, at the same time, the counter of the other group is provided with a reset command which takes effect at the next zero crossing. The instants at which the counting restarts in the two groups are not more than one half cycle apart. This insures faster and more accurate recognition.

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