Programmable digital tone detector

Details Programmable digital tone detector Programmable digital tone detector

H - Electricity

04

Q

328/162, 354/67

H04Q 9/10 (2006.01) H04Q 1/457 (2006.01)

Patent

CA 1126865

- 1 - PROGRAMMABLE DIGITAL TONE DETECTOR 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 combina- tion 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 an output when a specific com- bination 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.

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