How to Measure and Interpret Coherence Loss in Magnetic Recording
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.
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