Abstract: In the digital detector the center frequency and bandwidth of a digital fer is controlled by a microprocessor. Amplitude information for the original input signal may be preserved or a simple threshold of energy may be detected within a bandpass. The microprocessor scans a selected frequency spectrum by digitally changing the decoding data controlled by software. This detector in conjunction with a scanning algorithm permits data acquisition in addition to energy detection, data acquisition being the process of controlling an incoming signal within a bandpass by moving the center frequency and bandpass of the filter and generating a corresponding error signal as the feedback control signal.

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.

Abstract: The dual edge and level (DEL) flip-flop not only is sensitive to both posve and negative edges and level inputs, but the device can be made sensitive to (1) positive edges only, (2) negative edges only, (3) both positive and negative edges, or (4) neither positive or negative edges. In any case, the output can be controlled by the level inputs which override the edge operation.