generate questions: 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]
What kind of structure does a filter bank have? {sep_token} Due to a specific kind of structure, what kind of problems are made worse? {sep_token} What kind of resolution are the filter banks unable to provide an optimal solution for? {sep_token} Combining two filter banks' outputs creates what kind of problem? {sep_token} The need to code excess energy in the frequency domain decreases what kind of efficiency? {sep_token}