Signal Identification Using A Microprocessor Based Phase Locked Loop System
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A scheme for waveform comparison and the measurement of periodic signal parameters through processing, controlling and measuring programs is realised. A microcomputer is used with a phase locked loop voltage controlled oscillator that operates as a synchronised sample generator. The comparison (matching) method is based on a sample-to-sample comparison, where the normalised sample is compared with a reference at specified instants. The reference samples are of normal sinusoidal, triangular or square waveforms.