Due to the tree structure of the filter bank, pre-echo problems are made worse, as the combined impulse response of the two filter banks does not, and cannot, provide an optimum solution in time/frequency resolution. Additionally, the combining of the two filter banks' outputs creates aliasing problems that must be handled partially by the "aliasing compensation" stage; however, that creates excess energy to be coded in the frequency domain, thereby decreasing coding efficiency.[citation needed]
Due to the tree structure of the filter bank , pre - echo problems are made worse , as the combined impulse response of the two filter banks does not , and can not , provide an optimum solution in time / frequency resolution . Additionally , the combining of the two filter banks ' outputs creates aliasing problems that must be handled partially by the " aliasing compensation " stage ; however , that creates excess energy to be coded in the frequency domain , thereby decreasing coding efficiency.[citation needed ]
What kind of resolution are the filter banks unable to provide an optimal solution for?
What kind of resolution are the filter banks unable to provide an optimal solution for ?
time/frequency
time/frequency