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Delta Sigma modulation noise problem~! Help

Started by Leaf January 9, 2006
hi:

We all know that DSM is good because it's abaility to push Q noise to
higher frequency band.

My question is does DSM only work for Q noise?

What about if the data already corrupted by noise? therefore would DSM
work if the noise is the combination of background and quantization
noise.?

I have done some matlab coding(first order) on it and it works a bit
but i dont know if it's because of the lowpass filter or the DSM.

My project is trying to apply the DSM to clean noise of a corrupted
voice file.
Any Help will be great~!!!!

Cheers

Leaf

Leaf wrote:
> hi: > > We all know that DSM is good because it's abaility to push Q noise to > higher frequency band. > > My question is does DSM only work for Q noise? > > What about if the data already corrupted by noise? therefore would DSM > work if the noise is the combination of background and quantization > noise.? > > I have done some matlab coding(first order) on it and it works a bit > but i dont know if it's because of the lowpass filter or the DSM. > > My project is trying to apply the DSM to clean noise of a corrupted > voice file. > Any Help will be great~!!!!
Is there some rule that allows you to distinguish noise from clean signal? You can't separate them if you can't distinguish them. You can recognize quantization noise because you just made it yourself. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Jerry Avins wrote:

> Leaf wrote: > >> hi: >> >> We all know that DSM is good because it's abaility to push Q noise to >> higher frequency band. >> >> My question is does DSM only work for Q noise? >> >> What about if the data already corrupted by noise? therefore would DSM >> work if the noise is the combination of background and quantization >> noise.? >> >> I have done some matlab coding(first order) on it and it works a bit >> but i dont know if it's because of the lowpass filter or the DSM. >> >> My project is trying to apply the DSM to clean noise of a corrupted >> voice file. >> Any Help will be great~!!!! > > > Is there some rule that allows you to distinguish noise from clean > signal? You can't separate them if you can't distinguish them. You can > recognize quantization noise because you just made it yourself. > > Jerry
Or in other words, sigma-delta modulation is really cool, but it's not magic. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
Leaf,

As others have stated, this is not feasible. The reason is this: the
key to a delta sigma modulator is a feedback loop in which the
quantized signal (noise signal) can be compared to the non-noise
signal. In your scenario you don't have the non-noise signal to
build a loop around. 

--Randy

Randy Yates wrote:
> Leaf, > > As others have stated, this is not feasible. The reason is this: the > key to a delta sigma modulator is a feedback loop in which the > quantized signal (noise signal) can be compared to the non-noise > signal. In your scenario you don't have the non-noise signal to > build a loop around. > > --Randy
Randy, Thanks for your/others comments, based on what you have said i understand that its impossible to clean noise by using DSM as a software tool. therefore what would you suggest to clean noise from a poorly recorded voice on pc ? (a bit like digital remastering) Thanks Leaf
"Leaf" <johnsonyeah@gmail.com> writes:

> Randy Yates wrote: >> Leaf, >> >> As others have stated, this is not feasible. The reason is this: the >> key to a delta sigma modulator is a feedback loop in which the >> quantized signal (noise signal) can be compared to the non-noise >> signal. In your scenario you don't have the non-noise signal to >> build a loop around. >> >> --Randy > > Randy, > Thanks for your/others comments, based on what you have said i > understand that its impossible to clean noise by using DSM as a > software tool. > > therefore what would you suggest to clean noise from a poorly recorded > voice on pc ? (a bit like digital remastering)
Leaf, Use "noise cancellation." Adobe's "Audition," a tool for audio processing, has a noise canceller. Do a search using these keywords, and good luck. -- % Randy Yates % "So now it's getting late, %% Fuquay-Varina, NC % and those who hesitate %%% 919-577-9882 % got no one..." %%%% <yates@ieee.org> % 'Waterfall', *Face The Music*, ELO http://home.earthlink.net/~yatescr