"Rune Allnor" <allnor@tele.ntnu.no> wrote in message
news:1127834527.056157.152770@g14g2000cwa.googlegroups.com...
>
> ppirrip wrote:
> > Hi,

> A slightly longer answer is based on the periodogram.
> Let X[k] be the DFT of the time series x[n]. Then the
> periodogram P[k] is defined as
>
>   P[k] = X[k]*conj(X[k]) = |X[k]|^2.
>
You missed the division by N.

Shytot

ppirrip wrote:
> Thanks Rune!
>
> Do you have the citation of the books by Kay handy?  As there are too
> many books in that topic.

Go to amazon.com and search for Stephen L. Kay. He has written
a number of books with "Spectrum Estimation" in the title.
My favourtite is the one from 1988, which is out of print.
He published a two-volume work some three or four years ago,
that I have not seen myself, but that has gained good criticism.

> If I want to dig deep on this topic, start with google, what is the key
> word that you think I should use?  spectrum estimation doesn't seem to
> give me good result.

I don't know. I prefer to find textbooks for these kinds of things.
As I have been collecting textbooks in various subjects for 15 years,
I seldom use google to search for new material.

Rune

ppirrip wrote:
> Thanks Rune!
> 
> Do you have the citation of the books by Kay handy?  As there are too
> many books in that topic.
> 
> If I want to dig deep on this topic, start with google, what is the key
> word that you think I should use?  spectrum estimation doesn't seem to
> give me good result.  

I hope you can enlighten me. In what situation outside of a classroom 
would one know the PSD without having access to the signal itself?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

ppirrip wrote:
> Thanks Rune!
> 
> Do you have the citation of the books by Kay handy?  As there are too
> many books in that topic.
> 
> If I want to dig deep on this topic, start with google, what is the key
> word that you think I should use?  spectrum estimation doesn't seem to
> give me good result.  

I hope you can enlighten me. In what situation outside of a classroom 
would one know the PSD without having access to the signal itself?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

ppirrip wrote:
> Thanks Rune!
> 
> Do you have the citation of the books by Kay handy?  As there are too
> many books in that topic.
> 
> If I want to dig deep on this topic, start with google, what is the key
> word that you think I should use?  spectrum estimation doesn't seem to
> give me good result.  

I hope you can enlighten me. In what situation outside of a classroom 
would one know the PSD without having access to the signal itself?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

Thanks Rune!

Do you have the citation of the books by Kay handy?  As there are too
many books in that topic.

If I want to dig deep on this topic, start with google, what is the key
word that you think I should use?  spectrum estimation doesn't seem to
give me good result.  

Thanks again.

Hi,

If you use the IFFT, what would you use as the phase?

The quick answer to your question is "no", because the
PSD of a signal is only the magnitude, and you need
both magnitude and phase to reconstruct a signal.

--Randy