diff nonExposed/ebr.m @ 14:b1901e8d8f5f

initial commit

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nonExposed/ebr.m	Tue Mar 17 09:34:13 2015 +0100
@@ -0,0 +1,35 @@
+function s = ebr (fg, bg, offset, fgScale)
+% Computes the EBR of fg relatively to bg
+% If the optional argument offset is provided, will compute the EBR of fg
+% at position 'offset' in bg
+% If the optional argument fgScale is provided, the SNR of fg*fgScale over
+% bg will be returned instead
+
+% This program was written by Mathias Rossignol & Grégoire Lafay
+% is Copyright (C) 2015 IRCAM <http://www.ircam.fr>
+%
+% 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 3 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/>.
+
+if (nargin<=2) offset=1; end
+if (nargin<=3) fgScale=1; end
+
+endPosBg = min(offset+length(fg)-1, length(bg));
+endPosFg = endPosBg-offset+1;
+
+aFg = sqrt(sum((fg(1:endPosFg).*fgScale).^2)/endPosFg); %RMS
+aBg = sqrt(sum(bg(offset:endPosBg).^2)/endPosFg); %RMS
+
+s = 20*log10(aFg/(aBg+.001));
+%fprintf('fg from position %i to %i, %i samples, scale = %f, bg pow = %f, fg pow = %f, snr = %f\n', offset, endPosBg, endPosFg, fgScale, aBg, aFg, s);
+end