Sorry it was to help understand some results from a lab i did. But I have
already since figured it out on my own! Thanks :)
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Reply by Jerry Avins●February 2, 20052005-02-02
me again wrote:
> Sorry it was to help understand some results from a lab i did. But I have
> already since figured it out on my own! Thanks :)
>
> This message was sent using the Comp.DSP web interface on DSPRelated.com
Please don't keep us in suspense; explain a little.
Jerry
--
Engineering is the art of making what you want from things you can get.
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Reply by dspchick●February 2, 20052005-02-02
yes, this was a last resort to help me understand results of a lab, after
trying to figure this out over the period of a week with no avail. i have
since figured out what was happening! thanks.
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Reply by John Smith●February 2, 20052005-02-02
Homework season strikes again.... second posting of EXACTLY the same
question. Hmmmmmm.....
Reply by Gordon Sande●February 2, 20052005-02-02
quick one wrote:
> What I meant to ask about crosscorrelation:
>
> Suppose I have 2 signals r[n] and y[n] each of length N, and zero pad them
> to double their lengths and compute Y[k]R[k]* using FFTs in matlab. And
> then I zero pad that product with 8N zeros BEFORE taking the 10N-IFFT to
> get the crosscorrelation.
>
> It seems my correlation results are worse, but I cant understand exactly
> why.
>
> any help is appreciated!
>
> This message was sent using the Comp.DSP web interface on DSPRelated.com
The usual technical verbal shorthand (jargon) hides a lot of details.
Zero padding of a time sequence before taking its Fourier transform
is fairly straightforward to describe and understand.
BUT what is zero padding of a sequence of Fourier coefficients? When
done slowly and in full detail the Fourier transformed operation of
zero padding transforms into an interpolation operation which takes
a moderately complicated explanation. Perhaps you need more that
about 1/3 of a jargon filled sentence to say what you intended and
what you did.
Reply by quick one●February 2, 20052005-02-02
What I meant to ask about crosscorrelation:
Suppose I have 2 signals r[n] and y[n] each of length N, and zero pad them
to double their lengths and compute Y[k]R[k]* using FFTs in matlab. And
then I zero pad that product with 8N zeros BEFORE taking the 10N-IFFT to
get the crosscorrelation.
It seems my correlation results are worse, but I cant understand exactly
why.
any help is appreciated!
This message was sent using the Comp.DSP web interface on DSPRelated.com