Abstract
Subjective comparisons of the sensations produced by frequency- and amplitude-modulated octave-band noises were made by the method of adjustment. The results indicate a general correlation between the sensations produced by the two kinds of modulation. Expressed in changes of level (ΔL) and shifts (Δz) along the critical-band function, ΔL seems to be equal to C⋅Δz, where C = 10 dB/1.6 Bark. A second experiment shows the possibility of increasing and decreasing the sensation produced by amplitude modulation by adding in-phase or out-of-phase frequency modulation. The conclusion is reached that at least for noises the sensation produced by amplitude changes and that produced by frequency changes are based on the same mechanism.
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