aural combination tone

6.17  combination tone; aural combination tone. Secondary tone that can be perceived when two loud primary tones are presented simultaneously. The secondary tone may be a difference tone or a summation tone. Several combination tones may be produced from a single pair of primary tones. Unit, hertz (Hz).

Annotation 1      Combination tones can also be produced by aural harmonics (see C11.38).

Annotation 2      Combination tones are the result of the nonlinear characteristics of hearing.