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From: chung on 15 May 2010 05:28
I have a problem

now I process my signal using wavelet analysis . But the sample frequency is 22k ,not 44k

I don't know the bandwidth for each level node

anyone know hot calculate the bandwidth for each level node in wavelet analysis when the sample frequency of signal is 22k??

thanks
From: Wayne King on 16 May 2010 07:52
"chung " <mixfuture(a)hotmail.com> wrote in message <hslpf7$5vm$1(a)fred.mathworks.com>...
> I have a problem
>
> now I process my signal using wavelet analysis . But the sample frequency is 22k ,not 44k
>
> I don't know the bandwidth for each level node
>
> anyone know hot calculate the bandwidth for each level node in wavelet analysis when the sample frequency of signal is 22k??
>
> thanks

Hi Chung, at each level in the multiresolution analysis, the subband coding in the wavelet transform splits the signal into bands of approximately
[0 Fs/2^{j+1}) for the approximation
and
[Fs/2^{j+1}, Fs/2^j ) for the details (wavelet)

where j is the level of the transform. Keep in mind that this is just an approximation and the accuracy of the approximation depends on the wavelet being used. For example, it is probably not a terribly good approximation for the Haar wavelet, and a much better one for something like the Daubechies' least asymmetric length-16 wavelet.

Just substitute in your sampling frequency and level.

Wayne
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