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How to Measure and Interpret Coherence Loss in Magnetic Recording

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Coherence is a frequency-domain measure of common (that is, statistically linearly dependent) spectral components between the input and the output of a system. Coherence loss indicates the cumulative effect of noise, nonlinear distortion, and time-base distortion. Using appropriate digital signal processing techniques, it is possible to isolate and measure these three forms of signal degradation. All linear distortions are also predictable.

JAES Volume 35 Issue 11 pp. 869-887; November 1987
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AES - Audio Engineering Society