IMPROVED SPECTRUM TRANSFORMATION AND CONVOLUTION IN SUB-RANGES SPECTRUM Russian patent published in 2005 - IPC

FIELD: technologies for encoding audio signals.

SUBSTANCE: method for generating of high-frequency restored version of input signal of low-frequency range via high-frequency spectral restoration with use of digital system of filter banks is based on separation of input signal of low-frequency range via bank of filters for analysis to produce complex signals of sub-ranges in channels, receiving a row of serial complex signals of sub-ranges in channels of restoration range and correction of enveloping line for producing previously determined spectral enveloping line in restoration range, combining said row of signals via synthesis filter bank.

EFFECT: higher efficiency.

4 cl, 5 dwg