Abstract
The frequency resolving power (FRP) of human hearing as a function of spectral bandwidth was investigated using the phase reversal test in conjunction with recording slow auditory evoked potentials (AEPs). The test signal had a band-limited rippled spectrum. The central frequency of the spectrum was 2 kHz, and equivalent rectangular bandwidth (ERB) varied from 0.5 to 5 oct. The signal level was 80 dB SPL. The maximum ripple density at which AEPs to interchange of spectral peak and trough positions could be recorded was determined. The increase in ripple density and the decrease in spectrum ERB resulted in decrease of AEPs amplitude. At spectrum bandwidths from 5 to 2 oct, FRP was from 8.5 to 7.8 ripple per octave (RPO). This result is in agreement with psychophysical data. At a bandwidth of 1 oct, FRP was 6.5 RPO which is lower than psychophysical estimates.
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