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- W2037576307 abstract "Subjects listened to diotic sine-wave tones (72 dB) with center frequency f0 (700⩽f0 < 900 Hz) frequency modulated at sub-audible rate v (0.5 < v 10 Hz). In a 2IFC experiment subjects decided whether the first or second tone of a pair of tones had the wider vibrato. One tone of the pair was made with sine-wave FM waveform; the other was made with triangle FM waveform. The sine-wave modulation excursion was fixed at Δfs = ± 20 Hz; the triangle wave excursion varied amongst the trials 0.8Δfs < ΔfT < 1.5Δfs. (In this range of v and Δf it is impossible to identify the FM waveform.) The subject judgments were analyzed by a least-squares procedure to determine a locus of subjective equality, ΔfT(v), for which vibrato widths due to the different modulations seem to be equal. The resulting locus unambiguously shows that pitch averaging takes place for such stimuli. For v < 7 Hz the locus of subjective equality can be reproduced by a model of pitch averaging with averaging-time constant of 130 msec, a factor of 10 greater than pitch recognition times. For v > 7 Hz a different averaging process appears to proceed. This simple model was tested by additional identical experiments with Δfs = ± 40 Hz and Δfs = ± 10 Hz. The model may survive these tests, but in the small v regime we find that the averaging time is approximately inversely proportional to Δfs." @default.
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- W2037576307 date "1976-11-01" @default.
- W2037576307 modified "2023-10-18" @default.
- W2037576307 title "Time dependence of pitch perception—vibrato experiment" @default.
- W2037576307 doi "https://doi.org/10.1121/1.2003340" @default.
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