Frequency Discrimination in Noise

Abstract

Frequency-discrimination performance is measured as a function of the ratio of signal energy to noise power density ([epsilon] - [eta]o) for several values of frequency separation at 250, 1000, and 4000 cps. Discrimination performance at all frequencies and all frequency separations increases with increasing [epsilon] - [eta]o until [epsilon] - [eta]o reaches 40 dB. No further increase in performance was apparent with a further increase of 40 dB in [epsilon] - [eta]o.