Pulse counting circuit for key telephone system

Details Pulse counting circuit for key telephone system Pulse counting circuit for key telephone system

H - Electricity

04

M

379/33, 328/56,

H04M 3/42 (2006.01) H04M 1/31 (2006.01) H04M 1/72 (2006.01) H04M 9/00 (2006.01) H04Q 1/32 (2006.01) H04Q 3/42 (2006.01)

Patent

CA 1079882

ABSTRACT A counting circuit is disclosed which generates an electrical representation corresponding to the number of pulses in a plurality of pulse trains, each pulse train containing at most ten pulses. The circuit does not start to count the number of pulses in individual pulse trains until a first pulse train with more than a preselected number of pulses is received. The circuit then counts each pulse in subsequently received pulse trains for a preselected number of pulse trains. The circuit is parti- cularly useful in key telephone dial pulse signalling apparatus as a register circuit which is not responsive to false pulses generated by lifting the handset.

287119

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