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Vertical Localization of Noise Bands Pairs by Time-Separation and Frequency Separation

This study investigates how the vertical localization of the low-frequency is released from the domination of the high-frequency sound. Four different noise band pairs were used. They consist of a low-frequency band and a high-frequency band with different cut off frequency, and the low-frequency band was reproduced with a delay time of 25 ms to 200 ms to the high-frequency band. These stimuli were presented from one of five full-range speakers with different elevation set in the median plane. The speakers cover an upper vertical angle of 30 degrees and a lower vertical angle of 30 degrees. The subjects answered both the vertical sound image localization and the sound image width of the low-frequency band and the high-frequency band, respectively. As a result, while the high-frequency band was localized at the actual reproduction position, the low-frequency band showed a tendency of different vertical localization depending on the reproduction position. This tendency of the low-frequency band depending on the reproduction position was shown: in 30°, 15°, and 30°. As the delay time increased, the offset (deviation from the reproducing position) also increased, but the direction of deviation was different.

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