- Consider a 1-D signal F. The zeroth order scattering coefficient can be obtained by convolving F with the scaling function
to obtain S[0], the low frequency components at level 0. To obtain the high frequency components. we convolve F with the filter bank coefficients 
, where j is the level and k is the filter bank index, and take modulus of the outputs to extract 1st order scalogram coefficients U[1] or the high frequency components at level 1. To obtain the low frequency components at level 1, one can convolve the modulus values with the scaling function 
to obtain the values S[1]. In this way we keep breaking down the signal and keep repeating the process at each level. The scalogram coefficients U extract the high frequency or detailed components, while the scattering coefficients S extract the low frequency components at every level of resolution. - The 'FilterBank' value depends on the waveletScattering object sf. Changing the sf object changes the number of filter banks.
You can go through the following documentation link for further help:
