NORMSPECTROGRAM This function create a normalized spectrogram matrix by
doing the following algorithm:
Each spectrum is divided on 5-second windows overlapped by 2.5 seconds
(50%), on each window is applied:
1. Baseline correction
2. Tuckey window is applied with r=5%.
3. FFT on window signal.
4. Spectrum is smoothed by 5 points halfwidth moving average.
5. Each element of spectrum is normalized by maximum epsectral
amplitude.
Usage:
matrix = normspectrogram(t, acc)
[matrix, matrix_t, matrix_f] = normspectrogram(t, acc)
Where:
t: Time array
acc: Acceleration array (g)
Author: Pablo Pizarro @ppizarror.com, 2017-2019.
This program 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
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.