FREQUENCY RESOLVING POWER MEASURED BY RIPPLED NOISE

Frequency resolving power (FRP) was measured in normal humans using ri ppled noise with a phase-reversal test. The principle of the test was to find the highest ripple density at which an interchange of mutual p eak and trough position (the phase reversal) in the rippled spectrum i s detectable. In the frequency range below 0.5 kHz FRP was found to be about 21 ripples per kHz when tested by both broad-band and narrow-ba nd rippled noise. In the frequency range above 2 kHz, FRP measured by the narrow-band rippled noise was 22 to 23 relative units (relation of the noise central frequency to the ripple frequency spacing).