regarding white noise
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regarding white noise

 
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venugopal
Guest
Posted: Wed Dec 21, 2005 11:43 pm    Post subject: regarding white noise Reply with quote
hi,

I am new to these group.

I want to know why white noise floor is added to the autocorrelatio
function in the lpc analysis.

what is the difference between lsp and lsf

thanks in advance


venugopal
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Vladimir Vassilevsky
Guest
Posted: Thu Dec 22, 2005 12:32 am    Post subject: Re: regarding white noise Reply with quote
venugopal wrote:


Quote:
I want to know why white noise floor is added to the autocorrelation
function in the lpc analysis.

This is done to avoid the ill behavior of the LPC analysis when the
input is close to combination of the pure tones.

Quote:

what is the difference between lsp and lsf

Basically the same thing. Just the matter of naming.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com
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Guest
Posted: Fri Dec 23, 2005 1:16 am    Post subject: Re: regarding white noise Reply with quote
Quote:
I want to know why white noise floor is added to the autocorrelation
function in the lpc analysis.

I'm not an expert with LPC, but I know with adaptive dsp, you need to
keep the inverse of the autocorrelation matrix stable. This is
especially true with highly self-correlated signals. Injecting white
noise into a signal before taking the autocorrelation is similar to
adding a constant to the diagonals of the matrix. This increases the
singular values of the matrix which decreases the condition number. A
matrix with a lower condition number will invert more accurately (and
quicker). However, this comes at the cost of biasing the solution.

http://www.signalsguru.net
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