AUDIO SIGNAL PROCESSING Russian patent published in 2020 - IPC G10L21/02 G10L21/232 H03H17/06 

FIELD: audio signal processing means.

SUBSTANCE: audio signal processing device comprises a receiver receiving an audio signal with a sampling with a first sampling frequency, wherein the audio signal, having maximum frequency below half of first sampling frequency to limit of first frequency. Group of filters generates subband signals for a digital audio signal using overlapping sub-filters. First frequency shift unit applies a frequency offset to at least one subband from the set of subbands, and the decimator decimates the signals of subbands by a decimation value, leading to that the thinned sampling rate is at least twice as large as the bandwidth of each of the overlapping sub-filters. Frequency shift for the sub-band is provided for shifting the sub-band into a frequency interval which is a multiple of the frequency interval from zero to half of the thinned sampling frequency. Subband may be individually processed, and the processed subbands may be sequentially combined to generate a fullband output signal.

EFFECT: technical result is higher efficiency of audio processing.

14 cl, 13 dwg