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outsig=filterbank_init(b,a); outsig=filterbank_init(b,a,nsigs,hopsize);
fb=filterbank_init(b,a) creates a filterbank structure fb for use with filterbank_block. The filterbank will filter the input signals with the filters described in b and a.
fb=filterbank_init(b,a,nsigs) does the same assuming that the input to filterbank_block will consist of nsigs signal at once.