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annotate scripts/signal/synthesis.m @ 11469:c776f063fefe

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Overhaul m-script files to use common variable name between code and documentation.
author Rik <octave@nomad.inbox5.com>
date Sun, 09 Jan 2011 12:41:21 -0800
parents a1dbe9d80eee
children 1740012184f9
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1 ## Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2005, 2006,
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2 ## 2007 Andreas Weingessel
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} synthesis (@var{y}, @var{c})
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22 ## Compute a signal from its short-time Fourier transform @var{y} and a
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23 ## 3-element vector @var{c} specifying window size, increment, and
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24 ## window type.
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25 ##
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26 ## The values @var{y} and @var{c} can be derived by
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27 ##
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28 ## @example
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29 ## [@var{y}, @var{c}] = stft (@var{x} , @dots{})
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30 ## @end example
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31 ## @end deftypefn
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32
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33 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
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34 ## Description: Recover a signal from its short-term Fourier transform
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35
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36 function x = synthesis (y, c)
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37
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38 if (nargin != 2)
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39 print_usage ();
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40 endif
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41
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42 [nr, nc] = size (c);
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43 if (nr * nc != 3)
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44 error ("synthesis: c must contain exactly 3 elements");
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45 endif
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46
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47 w_size = c(1);
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48 inc = c(2);
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49 w_type = c(3);
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50
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51 if (w_type == 1)
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52 w_coeff = hanning (w_size);
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53 elseif (w_type == 2)
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54 w_coeff = hamming (w_size);
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55 elseif (w_type == 3)
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56 w_coeff = ones (w_size, 1);
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57 else
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58 error ("synthesis: window_type must be 1, 2, or 3");
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59 endif
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60
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61 z = real (ifft (y));
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62 st = fix ((w_size-inc) / 2);
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63 z = z(st:st+inc-1, :);
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64 w_coeff = w_coeff(st:st+inc-1);
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65
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66 nc = columns(z);
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67 for i = 1:nc
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68 z(:, i) = z(:, i) ./ w_coeff;
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69 endfor
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70
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71 x = reshape(z, inc * nc, 1);
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72
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73 endfunction