Cancellation equalizes internally produced combination tones with an external tone

Evidence

At test-tone frequencies near 1.4 kHz, the subject indicates audibility of an additional tone at the relatively low test-tone level of 40 dB. A careful examination of these results and discussions with experienced subjects show that inexperienced subjects do not hear the test tone at that frequency and level, but a difference tone near 600 Hz. This difference tone is produced through nonlinear distortions that originate in our own hearing system. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 430 (#expands, via linked claim)

Categorization

• XREF: connects to: Combination tones exist below both source tones and vary in audibility; Hardware cochlear model reproduces measured difference-tone cancellation data closely; Combination tones arise from the hearing system’s own nonlinearity — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 430 (+1 more)

Broader Connections

• Hardware cochlear model reproduces measured difference-tone cancellation data closely #corroborates (0.90)
• Combination tones exist below both source tones and vary in audibility #expands (0.85)
• Combination tones arise from the hearing system’s own nonlinearity #expands (0.80) — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 430
• Pure-tone instruments readily produce audible combination tones #exemplifies (0.80) — David Howard, Jamie Angus, coustics and Psychoacoustics, 1621