filter: added Parks-McClellen algorithm.

Renamed gr_remez to pm_remez here. Added QA code and fixed coding style.

2 files changed, 73 insertions, 0 deletions

diff --git a/gr-filter/include/filter/CMakeLists.txt b/gr-filter/include/filter/CMakeLists.txt
index 108509e9a..cdb07b2f9 100644
--- a/gr-filter/include/filter/CMakeLists.txt
+++ b/gr-filter/include/filter/CMakeLists.txt
@@ -76,6 +76,7 @@ add_custom_target(filter_generated_includes DEPENDS
 install(FILES
     api.h
     firdes.h
+    pm_remez.h
     fir_filter.h
     fft_filter.h
     ${generated_includes}
diff --git a/gr-filter/include/filter/pm_remez.h b/gr-filter/include/filter/pm_remez.h
new file mode 100644
index 000000000..a57e9e276
--- /dev/null
+++ b/gr-filter/include/filter/pm_remez.h
@@ -0,0 +1,72 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * 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 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_FILTER_PM_REMEZ_H
+#define INCLUDED_FILTER_PM_REMEZ_H
+
+#include <filter/api.h>
+#include <gr_types.h>
+#include <string>
+#include <stdexcept>
+
+namespace gr {
+  namespace filter {
+    /*!
+     * \brief Parks-McClellan FIR filter design using Remez algorithm.
+     *
+     * \ingroup filter_design
+     *
+     * Calculates the optimal (in the Chebyshev/minimax sense) FIR
+     * filter inpulse reponse given a set of band edges, the desired
+     * reponse on those bands, and the weight given to the error in
+     * those bands.
+     *
+     * \param order         filter order (number of taps in the returned filter - 1)
+     * \param bands         frequency at the band edges [ b1 e1 b2 e2 b3 e3 ...]
+     * \param ampl  	    desired amplitude at the band edges [ a(b1) a(e1) a(b2) a(e2) ...]
+     * \param error_weight  weighting applied to each band (usually 1)
+     * \param filter_type   one of "bandpass", "hilbert" or "differentiator"
+     * \param grid_density  determines how accurately the filter will be constructed. \
+     *			    The minimum value is 16; higher values are slower to compute.
+     *
+     * Frequency is in the range [0, 1], with 1 being the Nyquist
+     * frequency (Fs/2)
+     *
+     * \returns vector of computed taps
+     *
+     * \throws std::runtime_error if args are invalid or calculation
+     * fails to converge.
+     */
+
+    FILTER_API std::vector<double>
+    pm_remez(int order,
+	     const std::vector<double> &bands,
+	     const std::vector<double> &ampl,
+	     const std::vector<double> &error_weight,
+	     const std::string filter_type = "bandpass",
+	     int grid_density = 16
+	     ) throw (std::runtime_error);
+    
+  } /* namespace filter */
+} /* namespace gr */
+
+#endif /* INCLUDED_FILTER_PM_REMEZ_H */