generate coefficients for WFS FIR prefilters#29

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trettberg wants to merge 5 commits intomasterfrom

wfs_fir_prefilter

Commits on Dec 11, 2016

Add wfs_prefilter
Till Rettberg
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Fix wfs_prefilter: normalize to unit energy.
Till Rettberg
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Commits on Dec 12, 2016

Clean-up wfs_prefilter.
Till Rettberg
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Commits on Jan 24, 2017

Add wrapper function for WFS prefiltering.
Till Rettberg
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Commits on Feb 11, 2017

Use DelayedSignal in wfs_25d_fir_prefilter
Till Rettberg
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