Voice Audio Processing: fullFFT=shiftdown(coeff,n) - File Exchange

No BSD License

Highlights from
Voice Audio Processing

[deltaFs,fftSpect,halfSpect]=... Compute the FFT on the sampled signal
[fullFFT]=loudness2(fscale,co... function: given a range of frequencies [inf,sup]
[newcoeff]=loudness(fscale,co... find the indexes in the frequency scale
fullFFT=scaledown(coeff,n) function: scale down the frequency components
fullFFT=scaleup(coeff,n) function: scale up the frequency components
fullFFT=shiftdown(coeff,n) shift down the frequencies by n steps
fullFFT=shiftup(coeff,n) wav file in PCM forma to morph
mirrored=mirrorfft(newcoeff,c... this function make consistent the FFT that has been modified
newcoeff=pitchshift(coeff,nsh... wav file in PCM forma to morph
newspectrum=cthresh(spectrum,... Thresholding funcion on the module of the spectrum
playFile(y,Fs,filename) play original
plotSpectrum(fscale,spectrum) function: plot the spectrum
plotSpectrumColor(fscale,spec... plot the magnitude
plotTime(tscale,signal)
assignment1a.m
assignment1b.m
assignment1c.m
assignment1d.m
assignment1e.m
squaring.m
View all files

from Voice Audio Processing by Paolo Di Prodi
Basic processing of audio samples in wav format, using fourier transformation.

fullFFT=shiftdown(coeff,n)

% shift down the frequencies by n steps
% keep the DC component in place
function fullFFT=shiftdown(coeff,n)
%select the part that must be shifted
L=floor(length(coeff)/2);

%make the new vector with the DC in place
newcoeff=zeros(L,1);
newcoeff(1)=coeff(1);
newcoeff(2:L-n+2)=coeff(n:L);
fullFFT=mirrorfft(newcoeff,coeff);
end

Highlights from Voice Audio Processing

Highlights from
Voice Audio Processing