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The IIR interpolator module implements an upsampler followed by an IIR filter. The IIR low-pass filter is implemented as an 8th order elliptical filter. The module variable cutoffFreq must be smaller than Fs*0.5/D, where Fs is the sampling rate and D is the interpolation factor.
This module excepts accepts any input block size.
The output block size equals the input block size times the interpolation factor D.
The output sample rate equals the input sample rate times D
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