calculates the signal passing through a set of band-pass filters, from given signal spectra.
could be useful to resample spectra from a device to another one.
[x_transf,b_tansform] = simufilters(x_origin,filters)
a Div structure containing the spectra as lines
x_origin.v contains the numerical values of the wavelengths
a Div structure containing the mid-height width of the filters, on one row
filters.v contains the numerical values of the central wavelengths of the filters
a Div structure; x_transform.d contains the calculated signal
a Div structure; b_transform.d contains the matrix performing the transformation according to the equation: x_transform=x_origin*b_transform'