Theory of frequency modulation detection for low modulation frequencies

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Abstract
There is general agreement that the frequency difference limenmeasured in a two‐sine‐tone frequency discriminationexperiment is smaller than that measured in a frequency modulation(FM)experiment. We present a model of frequency modulation detection for low modulation frequencies, within the framework of signal detection theory, which accounts well for the observed difference between frequency discriminationexperiments and FM detection experiments. The FM detection model also predicts psychometric functions for detection of FM with different modulation waveforms. FM detection experiments with square, sine, trapezoid, and triangle FM are in reasonable agreement with the model predictions.

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