EXCAR Feature extraction using band frequency analysis
CALLS
[Ptot,t,etiq,tramos] = excar(y,frecs,anchos,fm,nfft,solap,Nombres)
INPUTS
{y}: Cell array with R data records each one consisting in a data
matrix [NxM] (N samples, M channels).
frecs: Vector (1xK) with a central frequency (in Hz) for each band
anchos: Vector (1xK) with a bandwidth value (in Hz) for each band
fm: Sampling frequency in Hz (1x1)
nfft: Size of the overlapping windows (1x1)
solap: Window overlapping (in p.u. with respect to nfft) (1x1)
Nombres: Names of the features corresponding to the rows of data matrices {cell array}
OUTPUTS
p: Data matrix containing the computed spectral features along time
t: Vector with times corresponding to each column of p
etiq: Labels with the names of each computed feature
Description:
This function divides signal y into overlaped windows of size nfft,
and computes the FFT algorithm, taking the RMS value of the signal content
in the bands specified by frecs and anchos for each variable in each time window.