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Decorrelation parameter in adaptive line enhancers (ALE)

Started by Artur1988 2 years ago2 replieslatest reply 2 years ago87 views

Hi all,

When implementing an adaptive line enhancer (ALE), we must apply a time delay (decorrelation parameter) to the measured signal, in order to obtain the filter input.

My question is: is this time delay a circular or a "traditional" shift? 

In other words: if the measured signal is

[4 3 7 1 8]

and the decorrelation parameter = 2,

shall the shifted signal look like this:

[1 8 4 3 7]

or this:

[0 0 4 3 7] ?

Thanks.

Best regards,

Artur


[ - ]
Reply by jbrowerApril 3, 2020

Artur-

If this page contains an accurate ALE diagram, showing a z-delta stage in a discrete time domain signal flow, then the shift would be linear ("traditional").

Using the nomenclature in your text the filter would see its input as:

[0 0 4 3 7]
[0 4 3 7 1]
[4 3 7 1 8]
     :
     :

-Jeff

[ - ]
Reply by Artur1988April 3, 2020

Thanks a lot, Jeff!

Best regards,

Artur