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Example magnitude spectra to visualize the criteria for the detection of ear-generated distortions. To this end, a portion of the spectra of the bottom left panel of Figure 4 is redrawn. The dark gray boxes indicate the 0.4 Hz wide frequency bands around the higher harmonics that were used to derive their power spectral densities. The light gray boxes indicate the 2.4 Hz wide frequency bands around the higher harmonic that were used to estimate the power spectral density of the noise. From these two quantities, a tone-to-noise ratio was calculated and expressed as a level difference ΔLtn. In addition, the ratio between the power in the narrow frequency band around the higher harmonics between the spectrum recorded in the listener’s ear and that recorded in the occluded-ear simulator was computed and expressed as a level difference ΔLtt,s. Based on these measures, it was decided whether an ear-generated distortion product is present (indicated by the black arrow) or not (see text for details).
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