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Thread Subject: Fold Amplitude Spectrum

Subject: Fold Amplitude Spectrum

From: Neo

Date: 1 Dec, 2008 16:19:01

Message: 1 of 2

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Hi does anyone know how to fold the amplitude spectrum below. There is a line of symmetry at about 4800 on my spectrum and I need the values on the right of this line to be on the negative x axis. I believe this is called folding the amplitude spectrum.

Any help much appreciated.

[s,fs,M]=wavread('dogbark.wav');

N=length(s)
T=1/fs;
y=fft(s);
X=y/N;
P=N*T;
f0=1/P;
Nf=N/2+1;
freq=[0:f0:(N-1)*f0];

stem(abs(Ax))
title('Amplitude Spectrum of Dogbark.wav')
xlabel('Frequency (Hz)')
ylabel('Amplitude')

Subject: Fold Amplitude Spectrum

From: Rune Allnor

Date: 1 Dec, 2008 16:55:44

Message: 2 of 2

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On 1 Des, 17:19, "Neo" <wills0...@hotmail.com> wrote:
> Hi does anyone know how to fold the amplitude spectrum below. There is a line of symmetry at about 4800 on my spectrum and I need the values on the right of this line to be on the negative x axis.

doc fftshift

Rune

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Tag Activity for This Thread
Tag	Applied By	Date/Time
wav	Neo	1 Dec, 2008 11:20:21
amplitude	Neo	1 Dec, 2008 11:20:21
spectrum	Neo	1 Dec, 2008 11:20:21

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