ANALYSIS FILTERBANK, SYNTHESIS FILTERBANK, ENCODER, DECODER, MIXER AND CONFERENCING SYSTEM Russian patent published in 2011 - IPC G10L19/02 

FIELD: information technology.

SUBSTANCE: analysis filterbank for filtering a plurality of time domain input frames, wherein an input frame comprises a number of ordered input samples, comprises a window transformer configured to generate a plurality of windowed frames, wherein a windowed frame comprises a plurality of windowed samples, wherein the window transformer is configured to transform the plurality of input frames in an overlapping manner using a sample advance value, wherein the sample advance value is twice less than the number of ordered input samples of an input frame, wherein the window transformer has a configuration which provides successive generation of two windowed frames based on two input frames which comprise over half the number of input samples of the same order, and the window transformer facilitates generation of a plurality of windowed frames such that the same ordered input samples of these two input frames, on which the generated two ordered windowed frames are based, advance relative the sequence of input samples of the input frame by a sample advance value; and a time/frequency converter configured to provide an output frame comprising a number of output values. The output frame is a spectral representation of a windowed frame.

EFFECT: reduced delay during digital processing of audio without significant deterioration of audio quality.

94 cl, 26 dwg, 12 tbl