APPARATUS AND METHOD FOR GENERATING SYNTHESIS AUDIO SIGNAL AND FOR ENCODING AUDIO SIGNAL Russian patent published in 2013 - IPC G10L21/02 

FIELD: information technology.

SUBSTANCE: apparatus for generating a synthesis audio signal includes a first converter for converting a an audio signal on a time interval into a spectral representation; a spectral domain patch generator for performing a plurality of different spectral domain patching algorithms, wherein each patching algorithm generates a modified spectral representation comprising spectral components in an upper frequency band derived from corresponding spectral components in a core frequency band of the audio signal, and select a first patching for the first time interval and a second patching algorithm for a second different time interval in accordance with the patching control signal; a high-frequency reconstruction manipulator for manipulating the modified spectral representation to obtain a bandwidth extended signal; and a combiner for combining the audio signal having spectral components in the core frequency band with the bandwidth extended signal to obtain the synthesis audio signal.

EFFECT: high quality of reproduction.