Duration Sensation When Listening to Pure Tone and Complex Tone
Kazi Saifuddin, Takaji Matsushima and Yoichi Ando
The duration sensation (DS) is a primary sensation of the sound stimuli of complex-tone, because musical notes include information of pitch and duration as well as loudness. Paired-comparison tests while changing the residue pitch or fundamental frequency, which correspond to the delay time of the first peak (t1) extracted from the autocorrelation function (ACF) were conducted. In Experiment 1, the white noise was used as a reference, and complex-tones (two pure-tone components) with three fundamental frequencies (250, 500, and 1000 Hz) were used as the test stimuli. Ten subjects judged whether or not the white-noise duration was longer than the complex-tone duration. Throughout investigation, the sound pressure level was fixed at 80 dB(A). And, the rise and fall times, defined as the time at a -3 dB drop from the steady level were kept a constant 1 ms. Results show that the DS of pure-tone and bandpass-noise stimuli is judged to be longer when is longer t1. Results of experiment 2 show that the DS of complex-tone stimuli is the same as that of the pure tone, if values of t1 are the same.
Key words: duration sensation, autocorrelation function (ACF), pure tone, complex tone
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