Houston, we have a trunk.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 61 insertions, 0 deletions

diff --git a/gnuradio-core/src/utils/plotfftavgk.m b/gnuradio-core/src/utils/plotfftavgk.m
new file mode 100644
index 000000000..3e19f40ce
--- /dev/null
+++ b/gnuradio-core/src/utils/plotfftavgk.m
@@ -0,0 +1,61 @@
+#
+# Copyright 2002 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 2, 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., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+# 
+
+function plotfftavgk_db (all_data, k, sample_rate)
+
+  if (nargin == 2)
+    sample_rate = 1.0;
+  endif;
+
+  if ((m = nargchk (2,3,nargin)))
+    usage (m);
+  endif;
+
+  ## len = 1024;
+  len = 8192;
+  ##window = ones (len, 1);
+  window = kaiser (len, 5);
+
+  s = zeros (len,1);
+
+  count = min (100, floor (length (all_data)/len));
+
+  for i = 0:count-1;
+    data = all_data((k+i)*len + 1 : (k+i+1)*len);
+    s = s + abs (fft (data.*window));
+  endfor;
+
+  s = s ./ count;
+
+  incr = sample_rate/len;
+  min_x = -sample_rate/2;
+  max_x = sample_rate/2 - incr;
+
+  x = min_x:incr:max_x;
+  ## y = 20 * log10(fftshift(s));
+  y = (fftshift(s));
+  plot (x, y);
+
+  i = find (y == max(y))
+  x(i)
+  y(i)
+
+endfunction