RFFT Calculate the DFT of real data Y=(X,N,D) Data is truncated/padded to length N if specified. N even: (N+2)/2 points are returned with the first and last being real N odd: (N+1)/2 points are returned with the first being real In all cases fix(1+N/2) points are returned D is the dimension along which to do the DFT

- fxrapt FXRAPT RAPT pitch tracker [FX,VUV]=(S,FS)
- lpcar2db LPCAR2DB LPC: Convert AR coefs to power spectrum in dB DB=(AR)
- lpcar2ff LPCAR2FF LPC: Convert AR coefs to complex spectrum FF=(AR,NP)
- lpcar2pf LPCAR2PF Convert AR coefs to power spectrum PF=(AR,NP)
- lpccc2db LPCCC2DB Convert complex cepstrum to dB power spectrum DB=(CC,NP,NC)
- lpccc2ff LPCCC2FF Convert complex cepstrum to complex spectrum FF=(CC,NP,NC)
- lpccc2pf LPCCC2PF Convert complex cepstrum to power spectrum PF=(CC,NP,NC)
- lpcra2pf LPCAR2PF Convert AR coefs to power spectrum PF=(RA,NP)
- melcepst MELCEPST Calculate the mel cepstrum of a signal C=(S,FS,W,NC,P,N,INC,FL,FH)
- modspect MODSPECT Calculate the modulation spectrum of a signal C=(S,FS,W,NC,P,N,INC,FL,FH)
- sigalign SIGALIGN align a clean reference with a noisy signal [d,g,rr,ss]=(s,r,maxd,m,fs)
- specsub SPECSUB performs speech enhancement using spectral subtraction [SS,ZO]=(S,FSZ,P)
- specsubm SPECSUBM obsolete speech enhancement algorithm - use specsub instead
- spgrambw SPGRAMBW Draw spectrogram [T,F,B]=(s,fs,mode,bw,fmax,db,tinc,ann)
- ssubmmse SSUBMMSE performs speech enhancement using mmse estimate of spectral amplitude or log amplitude [SS,ZO]=(S,FSZ,P)
- ssubmmsev SSUBMMSE performs speech enhancement using mmse estimate of spectral amplitude or log amplitude [SS,ZO]=(S,FSZ,P)
- v_windinfo WINDINFO window information and figures of merit X=(W,FS)
- vadsohn VADSOHN implements a voice activity detector [VS,ZO]=(S,FSZ,M,P)

0001 function y=rfft(x,n,d) 0002 %RFFT Calculate the DFT of real data Y=(X,N,D) 0003 % Data is truncated/padded to length N if specified. 0004 % N even: (N+2)/2 points are returned with 0005 % the first and last being real 0006 % N odd: (N+1)/2 points are returned with the 0007 % first being real 0008 % In all cases fix(1+N/2) points are returned 0009 % D is the dimension along which to do the DFT 0010 0011 0012 0013 % Copyright (C) Mike Brookes 1998 0014 % Version: $Id: rfft.m 713 2011-10-16 14:45:43Z dmb $ 0015 % 0016 % VOICEBOX is a MATLAB toolbox for speech processing. 0017 % Home page: http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html 0018 % 0019 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0020 % This program is free software; you can redistribute it and/or modify 0021 % it under the terms of the GNU General Public License as published by 0022 % the Free Software Foundation; either version 2 of the License, or 0023 % (at your option) any later version. 0024 % 0025 % This program is distributed in the hope that it will be useful, 0026 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0027 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0028 % GNU General Public License for more details. 0029 % 0030 % You can obtain a copy of the GNU General Public License from 0031 % http://www.gnu.org/copyleft/gpl.html or by writing to 0032 % Free Software Foundation, Inc.,675 Mass Ave, Cambridge, MA 02139, USA. 0033 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 0034 0035 s=size(x); 0036 if prod(s)==1 0037 y=x 0038 else 0039 if nargin <3 || isempty(d) 0040 d=find(s>1,1); 0041 if nargin<2 0042 n=s(d); 0043 end 0044 end 0045 if isempty(n) 0046 n=s(d); 0047 end 0048 y=fft(x,n,d); 0049 y=reshape(y,prod(s(1:d-1)),n,prod(s(d+1:end))); 0050 s(d)=1+fix(n/2); 0051 y(:,s(d)+1:end,:)=[]; 0052 y=reshape(y,s); 0053 end

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