Given the significant impact of interaural time difference on horizontal localization, and based on existing research findings on binaural cue perception mechanisms, this paper studies the relationship between interaural time difference, azimuth, and frequency. It further explores the orientation perception characteristics of interaural time difference, providing foundational data and laying a theoretical basis for efficient compression in parametric encoding. Seven discrete interaural time difference values were non-uniformly selected based on the sensitivity of human ears to different horizontal directions for auditory perception experiments. Experimental results indicate that within the low-frequency range of 350-1370 Hz and the interaural time difference range of 0 ?s to 500 ?s, as interaural time difference increases, its perceptual effect is increasingly influenced by frequency. Specifically, the interaural time difference is more sensitive to sounds with frequencies below 1000 Hz compared to those above 1000 Hz. Additionally, when the interaural time difference is less than approximately 380 ?s, the ability to accurately perceive interaural time difference stabilizes within the frequency range of approximately 1000 Hz to 1370 Hz. So the optimal frequency range for interaural time difference perception of azimuth appears to be between approximately 1000 Hz and 1500 Hz.
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