Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / lib / general / gr_cpfsk_bc.cc

diff --git a/gnuradio-core/src/lib/general/gr_cpfsk_bc.cc b/gnuradio-core/src/lib/general/gr_cpfsk_bc.cc
new file mode 100644 (file)
index 0000000..95d7c17
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_cpfsk_bc.cc
@@ -0,0 +1,78 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_cpfsk_bc.h>
+#include <gr_io_signature.h>
+#include <gr_expj.h>
+
+#define M_TWOPI (2*M_PI)
+
+gr_cpfsk_bc_sptr 
+gr_make_cpfsk_bc(float k, float ampl, int samples_per_sym)
+{
+  return gr_cpfsk_bc_sptr(new gr_cpfsk_bc(k, ampl, samples_per_sym));
+}
+
+gr_cpfsk_bc::gr_cpfsk_bc(float k, float ampl, int samples_per_sym)
+  : gr_sync_interpolator("cpfsk_bc",
+                        gr_make_io_signature(1, 1, sizeof(char)),
+                        gr_make_io_signature(1, 1, sizeof(gr_complex)),
+                        samples_per_sym)
+{
+  d_samples_per_sym = samples_per_sym;
+  d_freq = k*M_PI/samples_per_sym;
+  d_ampl = ampl;
+  d_phase = 0.0;
+}
+
+gr_cpfsk_bc::~gr_cpfsk_bc()
+{
+}
+
+int 
+gr_cpfsk_bc::work(int noutput_items,
+                     gr_vector_const_void_star &input_items,
+                     gr_vector_void_star &output_items)
+{
+  const char *in = (const char *)input_items[0];
+  gr_complex *out = (gr_complex *)output_items[0];
+
+  for (int i = 0; i < noutput_items/d_samples_per_sym; i++) {
+    for (int j = 0; j < d_samples_per_sym; j++) {
+      if (in[i] == 1)
+       d_phase += d_freq;
+      else
+       d_phase -= d_freq;
+      
+      while (d_phase > M_TWOPI)
+       d_phase -= M_TWOPI;
+      while (d_phase < -M_TWOPI)
+       d_phase += M_TWOPI;
+      
+      *out++ = gr_expj(d_phase)*d_ampl;
+    }
+  }
+
+  return noutput_items;
+}