Forums

Prewhitening....how to explain?

Started by Vicki May 11, 2005
Vicki wrote:
> Hi All, > Is there a book or source that explains what prewhitening is, in > relatively simple terms? Or would any of you like to explain it to me, > please? > > I have a blood flow signal and I want to prewhiten it and then do some > blind deconvolution on it to see what happens. As the prewhitener it > has been suggested to use a predictor as the signals I have are quite > short. (Some form of stochastic gradient algorithm (to prewhiten) > longer signals?) Is this correct? > > I just don't quite 'get' what prewhitening is about. Its a term I can > use but I can't explain it -- something that would be useful as I am > working with medics! > > > Many thanks >
Think of signal (or noise or spinal and noise) having a wedgie and a whitening filter as getting rid of or reducing the wedgie. It tends to spread things out and equalize them.
Stan Pawlukiewicz <spam@spam.mitre.org> writes:

> Vicki wrote: > > Hi All, > > Is there a book or source that explains what prewhitening is, in > > relatively simple terms? Or would any of you like to explain it to me, > > please? > > I have a blood flow signal and I want to prewhiten it and then do > > some > > > blind deconvolution on it to see what happens. As the prewhitener it > > has been suggested to use a predictor as the signals I have are quite > > short. (Some form of stochastic gradient algorithm (to prewhiten) > > longer signals?) Is this correct? > > I just don't quite 'get' what prewhitening is about. Its a term I > > can > > > use but I can't explain it -- something that would be useful as I am > > working with medics! > > Many thanks > > > > > > Think of signal (or noise or spinal and noise) having a wedgie and a > whitening filter as getting rid of or reducing the wedgie. It tends to > spread things out and equalize them.
Charming, Stan. I'll bet you say this to all the girls. -- Randy Yates Sony Ericsson Mobile Communications Research Triangle Park, NC, USA randy.yates@sonyericsson.com, 919-472-1124