Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / filter / gr_iir_filter_ffd.h

diff --git a/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h b/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
index 48413e6815f1f1a55b763c76b47c71d2ef692d6d..0382646f10f81547013f4f7f964b9320efdba203 100644 (file)
--- a/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
+++ b/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
@@ -35,17 +35,16 @@ gr_make_iir_filter_ffd (const std::vector<double> &fftaps,
 
 /*!
  * \brief  IIR filter with float input, float output and double taps
- * \ingroup filter
+ * \ingroup filter_blk
  *
  * This filter uses the Direct Form I implementation, where
  * \p fftaps contains the feed-forward taps, and \p fbtaps the feedback ones.
  *
- * \p fftaps and \p fbtaps must have equal numbers of taps
- *
+ * 
  * The input and output satisfy a difference equation of the form
 
  \f[
- y[n] - \sum_{k=1}^{N} a_k y[n-k] = \sum_{k=0}^{M} b_k x[n-k]
+ y[n] - \sum_{k=1}^{M} a_k y[n-k] = \sum_{k=0}^{N} b_k x[n-k]
  \f]
 
  * with the corresponding rational system function