diff options
Diffstat (limited to 'gnuradio-core/src/utils/plotfftk_db.m')
| -rw-r--r-- | gnuradio-core/src/utils/plotfftk_db.m | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/gnuradio-core/src/utils/plotfftk_db.m b/gnuradio-core/src/utils/plotfftk_db.m new file mode 100644 index 0000000000..498c22fccb --- /dev/null +++ b/gnuradio-core/src/utils/plotfftk_db.m @@ -0,0 +1,43 @@ +# +# Copyright 2001 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 plotfftk_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; + data = all_data(k*len + 1 : (k+1)*len); + ## s = fft (data.*kaiser(len, 5)); + ## s = fft (data.*hamming(len)); + s = fft (data.*hanning(len)); + + incr = sample_rate/len; + min_x = -sample_rate/2; + max_x = sample_rate/2 - incr; + plot (min_x:incr:max_x, 20 * log10(abs(fftshift(s)))); + +endfunction |