spectrum.cov - Covariance spectrum

Syntax

Description

Hs = spectrum.cov returns a default covariance spectrum object, Hs, that defines the parameters for the covariance spectral estimation algorithm. The covariance algorithm estimates the spectral content by fitting an autoregressive (AR) linear prediction model of a given order to the signal.

Hs = spectrum.cov(order) returns a spectrum object, Hs with the specified order. The default value for order is 4.

Note   See pcov for more information on the covariance algorithm.

Examples

Define a fourth order autoregressive model and view its power spectral density using the covariance algorithm.

randn('state',1);
x=randn(100,1);
x=filter(1,[1 1/2 1/3 1/4 1/5],x);   % 4th order AR filter
Hs=spectrum.cov;                     % 4th order AR model
psd(Hs,x,'NFFT',512)

See Also

dspdata | spectrum | spectrum.burg | spectrum.eigenvector | spectrum.mcov | spectrum.mtm | spectrum.music | spectrum.periodogram | spectrum.welch | spectrum.yulear

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