X-Git-Url: https://git.gag.com/?a=blobdiff_plain;ds=sidebyside;f=gnuradio-core%2Fsrc%2Flib%2Ffilter%2Fgr_iir_filter_ffd.h;h=0382646f10f81547013f4f7f964b9320efdba203;hb=f1cda009dfd5edd7e1e234b97a4456076aebac0a;hp=5ef36349e1e7bcf6d040b3541ce12a90f21667c5;hpb=5d69a524f81f234b3fbc41d49ba18d6f6886baba;p=debian%2Fgnuradio

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 5ef36349..0382646f 100644
--- a/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
+++ b/gnuradio-core/src/lib/filter/gr_iir_filter_ffd.h
@@ -6,7 +6,7 @@
  * 
  * GNU Radio is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
+ * the Free Software Foundation; either version 3, or (at your option)
  * any later version.
  * 
  * GNU Radio is distributed in the hope that it will be useful,
@@ -16,8 +16,8 @@
  * 
  * You should have received a copy of the GNU General Public License
  * along with GNU Radio; see the file COPYING.  If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
  */
 
 #ifndef INCLUDED_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