August West
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I'll get up and fly away
Posts: 71
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I suspect that you want to design for maximally flat delay over frequency. That way it looks most like simple delay and there is the least distortion of the waveshape. A filter with maximally flat envelope delay (MFED) is referred to as a Bessel or a Thompson filter [W.E. Thomson, "Delay Networks Having Maximally Flat Frequency Characteristics," Proc. IEEE, part 3, vol. 96. Nov 1949, pp. 487-490].
-August
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