ARCOV function in MATLAB Signal Processing

Hi,

I have a question about arcov function extracted feature of the raw signal. I have 5000 data sample of raw signal and I go through ARCOV to extract feature vector from the signal. After I completed the ARCOV, the data sample acquired only 101 data. Anyone can explain about the ARCOV function?

Answer 1

[Walter Roberson]

That would happen if you passed in 100 for the second parameter.

https://www.mathworks.com/help/signal/ref/arcov.html

"The output array, a, contains normalized estimates of the AR system parameters, A(z), in descending powers of z. a has p + 1 columns. If x is a vector, then a is a row vector. "

[nuradebah burhan]

Thanks for the answer. I'm still new in ARCOV function in feature extraction. I just wonder if that acceptable too much reducing the signal from 5000 data to 101 data?

[Walter Roberson]

It depends on the nature of the signal and what you need to do with it. Sometimes it would work out fine; sometimes too much information would be lost.

[nuradebah burhan]

Alright. 100 is the AR order right?. Is it have a max order for the AR order?

[Walter Roberson]

100 would be the AR order, yes.

I do not understand about the max order? There is no limit on p in the code; you could pass something larger than 100 if you wanted.