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Measurement of Nonlinear Distortion

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The harmonic, heterodyne (CCIF), and intermodulation (SMPTE) methods of distortion measurement are examined form a mathematical standpoint. It is found that all three methods yield equivalent information when properly applied but that the intermodulation method is most likely to yield objectively valid results in practical applications.

JAES Volume 1 Issue 1 pp. 62-67; January 1953
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