We study the distortion products evoked by twotone stimuli, ie combination tone which is obvious physiologically and psycho-acoustically, by analyzing the frequency spectrum in the ear canal sound pressure. We must consider those as follows;
1. Selection of proper apparatus, that is, low distortion oscillator, mixer, speaker, receiver, microphone and so on.
2. Proper sound pressure level of given twotones.
Although we could actually detected combination tone in the ear canal sound pressure by our designed system, it is not yet for sure that non-linear distortion generated in the experimental apparatus could be completely eliminated In the future, at first we must rule out the non-linearity in the apparatus through a study in the dummy ears that have normal function of the external and middle ear but no function of the inner ear, and then it should be possible to evaluate the results of different kinds of ear diseases.
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