The Baffle Effect of the Human Body on the Response of a Hearing Aid

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Abstract
Response curves of a hearing aid as a function of frequency of sound were obtained in relation to differences in body size, position on the body, distance from the body, and size and shape of the transmitter. All of these factors produce material effects on the response of the aid. In general, the effective response of an aid is changed about ten decibels when worn by a person facing the source of sound, but the variation in this change in relation to the factors studied and to additional effects makes the adoption of a standardized correction curve for a given hearing aid impossible. In addition, a correction curve for a given aid, obtained by careful measurements, cannot be applied to another hearing aid of similar dimensions.

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