Abstract
When a presented stimulus includes three pure-tone primaries of frequencies f1, f2, and f3, a combination tone generated by two of the primaries may combine with the third primary in generating further combination tones: for instance, 2f1 − (2f2 minus; f3) = 2f1 minus; 2f2 + f3. If the parent combination tone (in this case, 2f2−f3) is eliminated by canceling it with a pure tone of appropriate frequency, the “second-generation” tone (2f1 − f2 + f3) disappears along with it. The process of combination-tone generation thus appears to be a recursive one in which a combination tone, once generated, may participate in the generation of other combination tones. This suggests that distortion products in the ear are coupled back to the input of the distorting stage and themselves undergo distortion. Similar experiments using only two primaries suggest that all combination tones of odd order arise mainly from the recursive generation of cubic distortion products. The combination tone 2f2−f1, as well as the tone 2f1−f2 may be an important contributor to higher-order tones.
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