PSYCH 3A03 Lecture Notes - Interaural Time Difference, Inverse-Square Law, Sound Localization
5 Dec 2013
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Document Summary
Experiments have shown that the first wavefront arriving at the ears dominates in establishin location of sound source, and that we suppress information coming from later arriving wavefronts (echoes or reflections) This phenomenon is called law of first wavefront or precedence (haas) effect. Interaural time difference (itd) versus interaural phase difference (ipd) Interaural time difference (itd) does not vary with frequency. This is because the speed of sound (c) is independent of frequency. Interaural phase difference (ipd) does vary with frequency. Individual frequencies: percent localization errors at 1000hz due to phase locking. At high frequencies using interaural level differenes. At low frequencies using interaural time differences. Listeners make errors localzing pure tones near 1-3khz. Plot to right shows interaural level differences calculated for a source in the horizontal plane. The source is at an azimuth q of 10o, 45o, or 90-o- relative to straight ahead. Calculations assume that the ears are at opposite poles of a rigid sphere.
