周期性ピッチによるピッチ知覚の領域

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In pitch perception of complex tones, two kinds of pitch are recognized. Namely, in the lower pitch region the temporal information can be as a dominant cue in pitch perception, while the spectral one is dominant in the higher pitch region. Some different values, however, are reported by certain authors as the upper frequency limit of periodicity pitch. They are considered to be divided into two groups, i. e. about 800Hz and 200Hz. It is not expected that the transition from the periodicity pitch to the place pitch occurs abruptly. There may exist the frequency region where the periodicity pitch coexists with the place pitch. Therefore, the frequency region where the temporal information is a dominant cue in pitch perception may be lower than the upper frequency limit of periodicity picth. In order to investigate this region, we determined the pitch of the following stimuli;(a)a pulse train in which every second pulse is shifted 3 to 30% from its regular place along the time axis, (b)a pulse train in which the intensity of every second pulse is attenuated from 2 to 10dB, and (c)a pulse train in which a jitter is imposed on the time of appearance of every second pulse. The fundamental frequency of these series is a half of the pulse-rate. The results obtained are as follows:(1)As a relative displacement of every second pulse increases, the proportion of pulse-rate match decreases(Fig. 3)and instead the proportion of fundamental frequency match increases. (2)As a relative intensity of every second pulse decreases, the proportion of pulse-rate match decreases(Fig. 7). (3)As a relative temporal jitter of every second pulse increases, the proportion of pulse-rate match decreases(Fig. 9). (4)Along with an increase in pulse-rate, the pitch mode changes from pulse-rate match to fundamental frequency match. Up to about 150pps, in general, the pulse-rate match is dominant, where as the fundamental frequency match is dominant above 200 or 250pps for stimulus(a)and stimulus(b), and above 400pps for stimulus(c). Judging from the histograms of pitch matching(Fig. 4)and responses of basilar membrane model(Fig. 10 and 11)to stimuli used, it seems that the pitch is perceived on the basis of the temporal cue in the region of pulse-rate match and on the basis of the spectral cue in the region of fundamental frequency match. From these results, it is considered that the temporal cue is dominant in pitch perception up to about 200pps.
社団法人日本音響学会の論文
1973-05-01

周期性ピッチによるピッチ知覚の領域

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