Abstract
Measurements of the frequency response curves of the combined sound pressure in the ear canal—natural sound and amplified sound—with a no-mould fitted hearing aid are reported. Two sets of measurements were made: the first one shows the typical frequency response shape in ear canals grouped after their size—wide, normal and narrow —and the second one how the shape of the response curve can be affected by changing different parameters in the sound path from hearing aid microphone to sound tube opening. The frequency response curve in a no-mould fitting very often needs to be changed to match the specific audiogram and ear canal size of the patient. The influence from the different parameters on the frequency response curves are reported, but not all parameters have the same degree of modifying effect,—even some modification methods are recommende not to be used in the fitting work. The best means to modify the frequency response curve is a change of the I. D. (inner diameter) of the sound tube. This findin...
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