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Abstract
The investigation was carried out for the purpose of clarifying the acoustic differences which arise between the ears at different azimuths. Measurements of time, phase and intensity differences of the sound entering the ears of a dummy head were performed with the sound source placed at different azimuths around the head, and using the frequencies 500, 1000, 2000, 4000 and 8000 cps, with the sound source 165 cm from the head. The results indicate that the time difference constitutes a linear function of azimuth between the angles of 0°-60° and between 120°-180°. The same thing applies to the phase difference, if expressed in time. The difference in intensity appears to be a very irregular function of azimuth and has to a great extent failed to agree with previously published findings. The matter of directional hearing is discussed on the basis of physical measurements and data obtained.
