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CORRELATORS FOR SIGNAL RECEPTION
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1952
Year
Unknown Venue
Linear Rectifier CorrelatorsEngineeringMeasurementSound QualityNoiseSpeech ProcessingAcoustical EngineeringSignal DetectionAcoustic Signal ProcessingCorrelation TechniquesTrue CorrelatorsSignal ProcessingElectromagnetic Compatibility
Abstract : Study was undertaken to investigate the application of correlation techniques to acoustic receiving systems. Correlators (multiplier-averagers) were analyzed and compared with detectors (rectifier-averagers) of various power laws from the standpoint of their use in signal reception systems. Comparison was made in terms of S/N ratio for the limiting case of small input S/N ratio and long averaging time. Of the various detectors, the square law appeared somewhat superior for determining the presence of a small signal in a noise background. When 2 samples of the signal in incoherent background noises were available, the correlator showed the advantage that no constant terms independent of the signal appear at its output. Analysis of 2 circuits, the polarity-coincidence and the linear rectifier correlators, showed that both of these were slightly inferior to true correlators in output S/N ratio.