Cancellation tones alter inner-ear nonlinearity by only 1-2 dB at worst

Evidence

The pulsation-threshold method (see Sect. 4.4.6) uses a non-simultaneous presentation, in which the pulsation threshold of the additionally presented electronically produced tone at the difference frequency is measured. The cancellation method has been partially opposed in the literature, using the argument that the additional cancellation tone may change the nonlinearity and lllay therefore influence the result. In principle such an effect appears in any nonlinear device. However, this influence has been studied carefully. and it was shown that, for the worst case (equal amplitude of the primaries), it results in oul)’ small 1- or 2-dB effects. which arc about the accurae)’ of measurement. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1531