Counting circuits for multifrequency tone detectors

Details Counting circuits for multifrequency tone detectors Counting circuits for multifrequency tone detectors

G - Physics

06

F

328/161, 379/20

G06F 9/00 (2006.01) G01R 23/02 (2006.01) G04F 10/04 (2006.01) H03K 21/02 (2006.01) H03K 21/38 (2006.01)

Patent

CA 1093161

COUNTING CIRCUITS FOR MULTIFREQUENCY TONE DETECTORS Abstract of the Disclosure Intervals between zero crossings of tone signals on two incoming lines are measured by a clock driven, free running binary counter common to the two lines and by an overflow counter individual to each line. The overflow counter is reset by the reception of the zero crossing of the tone signal and is then advanced by each overflow and recycle of the common counter. The common count number, produced when the zero crossing at the start of the interval is received, is processed with the common count number and the overflow number, produced when the zero crossing at the end of the interval is received, to calculate the duration of the interval and thereby determine the frequency of the tone.

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