Abstract
The diffuse field pressure transfer function H(f) to the ear canal of human infants was measured from 100–11 000 Hz. The diffuse field pressure and the ear canal pressure were simultaneously measured in a reverberant room using spatial averaging of source and microphones. The probe microphone tip was inserted 5 mm into the infant ear canal, and the parent was instructed to hold the infant while slowly walking around the room; an experimenter walked around the room with the other microphone. Results using KEMAR and in adult canals were consistent with the literature. H(f) for the 1-month-old infants has a strong peak (10–15 dB) at 4–5 kHz. The majority of the ten infants showed a twin peak structure, with the additional peak (8–12 dB) at 5–6 kHz, H(f) has a dip at 8–9 kHz and increases up to 11 kHz. A 5-dB peak at 1-2 kHz may be due to the proximity of the parent's torso to the infant's head. Additional results on older infants will be discussed. [Work supported by NIH.]
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