Combination tones can be cancelled by adding matched opposite-phase tones

Evidence

When two primary tones with the frequencies hand 12 are presented to an ear, additional tones with pitches correlated to the frequencies 12 - hand … 2h - 12 become audible (see Chap. 14). Such audible distortion products can be cancelled by adding a tone of corresponding frequency and correct level and phase. Such cancellation, based on psychoacoustical perception, is called hearing cancellation. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 330

Categorization

• DEFINE: Defines ‘hearing cancellation’ — the perceptual method for cancelling audible distortion product tones.