Analysis filter bank, synthesis filter bank, encoder, decoder, mixer and conference system

摘要

A bank of analysis filters for filtering a plurality of time domain input frames, each input frame comprising a number of input samples ordered, respectively, comprising: a window former configured to generate a plurality of window frames, a window frame comprising a plurality of window samples, wherein the window former is configured to process the plurality of input frames in an overlapping manner using an advance value of the sample, wherein the advance value of the sample is less than the number of input samples ordered from an input box divided by 2; wherein the window former is configured to consecutively generate two window frames based on two input frames at, for each input frame, weigh at least a plurality of input samples of the respective input frame with a window function , with the two input frames overlapping in a number of ordered input samples that is greater than half the number of input samples ordered from the input frames, and where the window former is configured to generate the plurality of frames of window so that the same input samples ordered from the two input frames, on which the two window frames generated consecutively are based, are shifted with respect to the order of the input samples of the input frame by the value in advance of the sample and a time / frequency converter configured to provide an output frame comprising a val number Output ores, an output box being a spectral representation of a window box.