7.2 Spline resampler

26.4023GPPAdditional decoder toolsEnhanced aacPlus general audio codecGeneral audio codec audio processing functionsTS

Given the discrete time output from synthesis QMF bank the spline resampler relies on the continuous time signal representation,

where is a cubic B-spline supported on the interval .The discrete time output of the resampler is then defined, up to a suitable delay, by . For each , define the integer and the remainder by

Then the spline evaluation results in the time varying causal filtering,

with homogeneous initialization and filter coefficients