Microprocessor controlled digital detector
First Claim
1. A microprocessor controlled digital detector for detecting the presence of selected frequencies in an input signal comprising:
- a microprocessor system having a plurality of inputs and outputs, a waveform shaping circuit having an input adapted to receive an input frequency signal and an output coupled to said microprocessor system, an analog-to-digital converter having an input coupled to receive said input frequency signal and an output coupled to said microprocessor system, a buffer coupled to receive an output from said microprocessor system and having an output indicative of the bandpass of said input signal, and a digital-to-analog converter having an input coupled to an output of said microprocessor system and having an output indicative of the amplitude of said input signal.
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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.
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Citations
6 Claims
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1. A microprocessor controlled digital detector for detecting the presence of selected frequencies in an input signal comprising:
- a microprocessor system having a plurality of inputs and outputs, a waveform shaping circuit having an input adapted to receive an input frequency signal and an output coupled to said microprocessor system, an analog-to-digital converter having an input coupled to receive said input frequency signal and an output coupled to said microprocessor system, a buffer coupled to receive an output from said microprocessor system and having an output indicative of the bandpass of said input signal, and a digital-to-analog converter having an input coupled to an output of said microprocessor system and having an output indicative of the amplitude of said input signal.
- View Dependent Claims (2, 3, 4)
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5. In a microprocessor controlled digital detector for detecting the presence of a selectable frequency above a threshold value of amplitude, the method of detection comprising the steps of:
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establishing preliminary, adjustable upper and lower band edge limits for a bandpass within a digital memory circuit; detecting a continuous wave frequency input signal; counting digital pulses indicative of the positive half cycle of said continuous wave frequency for obtaining a pulse count equivalent to the period of said frequency; comparing the count of said digital pulses to said established band edge limits for determining whether the count lies below, within, or above said limits; providing an output signal indicative of the upper and lower limits of said band edge; and adjusting said limits incrementally and recomparing the pulse count to the band edge limits until said pulse count falls within said adjustable upper and lower limits. - View Dependent Claims (6)
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Specification