Houston, we have a trunk.

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

1 files changed, 27 insertions, 0 deletions

diff --git a/gnuradio-core/src/utils/lp_to_bp.m b/gnuradio-core/src/utils/lp_to_bp.m
new file mode 100644
index 000000000..8718baed2
--- /dev/null
+++ b/gnuradio-core/src/utils/lp_to_bp.m
@@ -0,0 +1,27 @@
+#
+# 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.
+# 
+
+## transform low pass coefficients into bandpass coefficients
+
+function bp_taps = lp_to_bp (lp_taps, center_freq, sampling_freq)
+  arg = 2 * pi * center_freq / sampling_freq;
+  bp_taps = lp_taps .* exp (j*arg*(0:length(lp_taps)-1)');
+endfunction