FIELD: information technology.
SUBSTANCE: device for expanding audio signal frequency bandwidth includes signal expansion unit (102) for creation of audio signal version as time signal expanded by time with coefficient of expansion greater than 1; decimator (105) to decimate audio signal version (103) with decimation coefficient corresponding to coefficient of expansion; filter (107, 109) to extract distorted signal from decimated audio signal (106) containing frequency range which is not contained in the audio signal or to extract signal from the audio signal before its expansion by signal expansion unit (102), where the signal contains frequency range which is not contained in the audio signal (106) after its expansion and decimation, and distorted signal (108) is distorted in such a way that distorted signal (108), decimated audio signal or combined signal have preset envelope; and combiner (111) to combine distorted or undistorted signal with audio signal (100) to obtain audio signal (112) that is expanded by bandwidth.
EFFECT: higher quality of expanded bandwidth with decreased computational complexity of signal processing.
16 cl, 15 dwg
