Abstract
The cubic difference tone (CDT) 2f1−f2 is measured by compensation as a function of the stimulus level L and of the frequency ratio f2/f1 of the primaries f1, f2 (f1<f2) in the 2−kHz region. Relative minima of the cancellation level LCT are observed for a certain range of the stimulus level L and the frequency ratio f2/f1 which can be regarded as a ’’region of existence’’ for these nonmonotonicities. No satisfactory explanation can be given for the observed nonmonotonic behavior of the CDT. In a second part some research is done on the quasicubic difference tone (QCDT) f1+f2−f3 that can be perceived under certain stimulus conditions if three tones f1, f2, f3 are presented to a normal human ear. Its dependence on the amplitude and on the frequencies of the primaries is comparable to the analogous behavior of the CDT. In particular, the QCDT f1 + f2 − f3 shows the same nonmonotonicity as a function of the stimulus frequencies as the CDT 2f1 − f2. From this similarity, it can be concluded that the nonmonoton...
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