Programmable digital tone detector

Details Programmable digital tone detector Programmable digital tone detector

1978-08-10

1980-08-05

Yusko, Donald J.

Communications: electrical

Digital comparator systems

235 92FQ, 324 78D, 324 82, 328134, 329112, 364724, H04Q 910, H03K 1302, G06F 305, G01K 2500

Patent

active

042164630

ABSTRACT:
A plurality of up/down counters are controlled by a programmed digital reference signal. The combination of a high select signal and a high input signal causes any one of the counters to increment (up) by one count while a combination of a high select signal and a low input signal causes any one of the counters to decrement (down) one count. A threshold detector signals on output when a specific combination of the counters reaches a predetermined combination count signifying correlation of the programmed reference with the input tone over a predetermined number of cycles. The phase of the input may be determined by noting which of the counters reaches the predetermined threshold.

REFERENCES:
patent: 3760269 (1973-09-01), Beeman et al.
patent: 3922670 (1975-11-01), Shaw et al.
patent: 3935437 (1976-01-01), Schmitt et al.
patent: 4016371 (1977-04-01), Hammad
patent: 4019149 (1977-04-01), Kustka et al.
patent: 4059804 (1977-11-01), Agnus et al.
patent: 4071821 (1978-01-01), Harthill et al.
patent: 4125866 (1978-11-01), Van Essen et al.
A. D. Proudfoot, "Simple Multifrequency Tone Detector", Electronics Letters, Oct. 19, 1972, vol. 8, No. 21, pp. 524-525.

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