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Message: <blockquote data-quote="thch" data-source="post: 3717602" data-attributes="member: 562032">the title is pretty close, Q = Bandwidth / CenterFrequency.(center frequency is geometric, not arithmetic)eg, a filter with a Q of 1, centered at 100hz, would mainly affect 61.8hz - 161.8hz.  note that this is 100hz of bandwidth (1 * 100hz = Q * Fc), and that 100hz is the geometric mean (61.8 * 161.8 = 100 * 100).  a Q of 10 would mean only 10hz around 100hz are primarily affected (95.1hz to 105.1hz)since your HU has feasible Q values, the "Q" might actually refer to Q.  Simpler HUs often have Q as a "1 2 or 3", where 1,2, and 3 are settings and not literal values for Q.</blockquote>

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