Does High Sampling Frequency Improve Perceptual Time-Axis Resolution of Digital Audio Signal?

The effect of frequency bandwidth on perceptual time-axis resolution of a digital audio signal was studied experimentally. Four kinds of pulse train having constant intervals were used for the test signal. To make the test signal, the upper frequencies were limited using an FIR low-pass filter.

Cutoff frequencies of the FIR low-pass filter were 40 kHz and 20 kHz. The experiment was performed in a room with a volume of 54.7 m3, reverberation time of 0.36 s (at 1 kHz), and noise level of NC-25. As the reference signals, pulse trains having designated intervals 1, 0.5, 0.25, and 0.125 s were used.

On the other hand, pulse train having slightly different intervals from the reference signals (maximum+20% to -20% were used as the test signals. Reference signals and test signals were presented alternately to the subjects. The subjects were asked whether the test signal is equal to the reference signal or not by hearing.

The subjects were 11 males, age 22 to 24, having normal hearing. ... more.

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