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<blockquote data-quote="Michael John" data-source="post: 206523" data-attributes="member: 830"><p>Hi Phillip,</p><p></p><p>A number of smoothing/averaging functions in FIR Designer have the option to "Use coherence." Coherence (usually plotted as a function of frequency) is a measure of how reliable each frequency component is, on a scale of 0.0 to 1.0.</p><p></p><p>When "Use coherence" is checked, the smoothing/averaging process considers frequency values with a higher coherence score to be more important than frequency components with a low coherence score, and so the smoothed/averaged result will tend closer to the values with high coherence.</p><p></p><p>Mathematically, rather than taking a simple average (i.e. summing values and dividing by the number of values), using coherence involves multiplying each frequency component by its coherence value, summing them all up, then dividing by the sum of the coherence scores themselves: essentially weighted averaging.</p><p></p><p>Coherence appears in SMAART trace (TRF) files and SysTune overlay (STO) files.</p><p></p><p>Kind regards,</p><p>Michael</p></blockquote><p></p>
[QUOTE="Michael John, post: 206523, member: 830"] Hi Phillip, A number of smoothing/averaging functions in FIR Designer have the option to "Use coherence." Coherence (usually plotted as a function of frequency) is a measure of how reliable each frequency component is, on a scale of 0.0 to 1.0. When "Use coherence" is checked, the smoothing/averaging process considers frequency values with a higher coherence score to be more important than frequency components with a low coherence score, and so the smoothed/averaged result will tend closer to the values with high coherence. Mathematically, rather than taking a simple average (i.e. summing values and dividing by the number of values), using coherence involves multiplying each frequency component by its coherence value, summing them all up, then dividing by the sum of the coherence scores themselves: essentially weighted averaging. Coherence appears in SMAART trace (TRF) files and SysTune overlay (STO) files. Kind regards, Michael [/QUOTE]
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