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Autocorrelation method
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the signal is windowed by N-point window for autocorrelation
method which results in Toeplitz resulting matrix leading to
one type of solution for predictor coefficients
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the stability of the system H(z) is guaranteed
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Covariance method
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the signal is assumed to be known for the set of values
(-p, N-1) for covariance method which results in symmetric
matrix instead of Toeplitz matrix
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the stability of the system can not be guaranteed