/usr/share/octave/packages/audio-1.1.4/soundsc.m is in octave-audio 1.1.4-4build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | ## Copyright (C) 2000 Paul Kienzle
##
## 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, see <http://www.gnu.org/licenses/>.
## usage: soundsc(x, fs, limit) or soundsc(x, fs, [ lo, hi ])
##
## soundsc(x)
## Scale the signal so that [min(x), max(x)] -> [-1, 1], then
## play it through the speakers at 8000 Hz sampling rate. The
## signal has one column per channel.
##
## soundsc(x,fs)
## Scale the signal and play it at sampling rate fs.
##
## soundsc(x, fs, limit)
## Scale the signal so that [-|limit|, |limit|] -> [-1, 1], then
## play it at sampling rate fs. If fs is empty, then the default
## 8000 Hz sampling rate is used.
##
## soundsc(x, fs, [ lo, hi ])
## Scale the signal so that [lo, hi] -> [-1, 1], then play it
## at sampling rate fs. If fs is empty, then the default 8000 Hz
## sampling rate is used.
##
## y=soundsc(...)
## return the scaled waveform rather than play it.
##
## See sound for more information.
function data_r = soundsc(data, rate, range)
if nargin < 1 || nargin > 3, usage("soundsc(x, fs, [lo, hi])") endif
if nargin < 2, rate = []; endif
if nargin < 3, range = [min(data(:)), max(data(:))]; endif
if isscalar(range), range = [-abs(range), abs(range)]; endif
data=(data - mean(range))/((range(2)-range(1))/2);
if nargout > 0
data_r = data;
else
sound(data, rate);
endif
endfunction
%!demo
%! [x, fs] = auload(file_in_loadpath("sample.wav"));
%! soundsc(x,fs);
%!shared y
%! [x, fs] = auload(file_in_loadpath("sample.wav"));
%! y=soundsc(x);
%!assert (min(y(:)), -1, eps)
%!assert (max(y(:)), 1, eps)
|