Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: pwelch power correction factor
Posted:
Nov 18, 2010 11:37 PM


> What makes you think you need a correction factor? > Instead of replicating what matlab does, read up on > the method you play with. > > Rune
Rune,
The motivation for the correction factor comes from the fact that windowing reduces the power of the signal, therefore, the power of the psd is much lower than that of the unwindowed signal. Another way of looking at it is that the correction factor makes the power spectrum estimate asymptotically unbiased (See Hayes, Statistical Digital Signal Processing and Modeling for a reference).
Also, I read the documentation for the function, and I think my question is a fair one. I could just blindly use the function as is, but then I lose a learning opportunity.



