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<para>compute a single interpolated differentiated output value. </para>
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<para>if mu is not in the range [0, 1].</para>
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<para>Compute intermediate samples of the derivative of a signal between signal samples x(k*Ts). </para>
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<para>This implements a Minimum Mean Squared Error interpolating differentiator with 8 taps. It is suitable for signals where the derivative of a signal has a bandwidth of interest in the range (-Fs/4, Fs/4), where Fs is the samples rate.</para>
<para>Although mu, the fractional delay, is specified as a float, in the range [0.0, 1.0], it is actually quantized. That is, mu is quantized in the differentiate method to 128th&apos;s of a sample. </para>
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