Digital detector
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsRichard A. Lane, Donald K. Fronek
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Abstract
A digital detector which responds to sinusoidal or square wave input sign to detect the presence of a particular frequency or band of frequencies and provide a selectable digital output indicating the presence of this frequency or band. A gated pulse generator operates in response to the input signals, providing pulses that are counted by a binary counter and sensed by a decoder which detects the presence or absence of the frequencies within the selectable bandwidth limits.
Claims5
A digital detector for detecting the presence of selected frequencies in an input signal comprising:
- counting means having an input and an output;
- a NAND gate having first and second inputs and an output, said output being coupled to said counting means input;
- shaping means having an input for receiving said input frequency signals and an output for providing a shaped gating pulse, the output of said shaping means being coupled to the first input of said NAND gate;
- a pulse generator having an output coupled to said second NAND gate input and having a gating input coupled to said shaping means output;
- and a decoder circuit coupled to said counter output for responding to said counter output to provide output pulses as a function of said detector input frequencies.
Dependencies are inferred from the claim text.