ARCOV function in MATLAB Signal Processing

2017 10 31
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更新时间：2017 10 31
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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?

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回答（1 个）

Walter Roberson
Walter Roberson 2017-10-31

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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. "

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nuradebah burhan
nuradebah burhan 2017-10-31
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
Walter Roberson 2017-10-31
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
nuradebah burhan 2017-10-31
Alright. 100 is the AR order right?. Is it have a max order for the AR order?
Walter Roberson
Walter Roberson 2017-10-31
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.

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