Abstract
A variety of subjective effects due to the phase spectra of complex stimuli have been observed. The stimuli were periodic wave forms of constant amplitude spectrum containing up to 31 coherent harmonics. Among the more striking effects are the following: Strong dependence of the “timbre” on the “peak factor” of the stimulus. Weaker, but still audible, effects occur for phase changes which lead to identical peak factors. Small or no subjective changes are produced by variations of the phase spectrum which leave the “envelope” of the stimulus invariant. Other manipulations of the phases produce distinct tones which permit one to play simple melodies by varying only the relative phases. The results of formal measurements of phase difference limen for periodic stimuli will also be presented.
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