The amplitude spectrum of an acoustic signal presented to the microphone of a hearing aid is altered drastically before it finally reaches the user’s eardrum. A major part of this alteration is due to the interaction of various mechanical and acoustic resonances which are characteristic of the hearing‐aid receiver and the sound transmission system linking the receiver with the eardrum. Because of the complexity of this phenomenon, there is yet no means for predicting, apriori, the true shape of the sound spectrum that will occur at the user’s eardrum. This paper reports on the development and testing of just such a scheme. The accuracy of this scheme—a computer‐aided mathematical technique—is measured in the laboratory on real and artificial ears. The results of those measurements show good agreement between experimental and computer‐generated data below 5000 Hz.

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