This paper will show that IM measurements serve as a basis for correlating measured values of nonlinearity with subjective listening tests. Distortion resulting from intermodulation is more annoying than that due entirely to harmonics, and the IM method is shown to measure hi distortion-an impossibility with harmonic methods of analysis. Two types of IM measuring methods are described, and the advantages of each for certain types of component measurement are presented.
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https://aes2.org/publications/elibrary-page/?id=128
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