DWT=The wavelet decomposition can be described as iterative signal decomposition, using filter banks of low-pass and highpass filters (organized in a tree) with downsampling of their outputs.in each level the length of coeffs is reduced by half ex: original signal (2000) then length of coeffs from first level is 1000 an so on.
SWT=the outputs of decomposition filters in all decomposition levels are not downsampled. We can avoid interpolation errors that might occur during the reconstruction part.the length is the same in each level.
