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