AUDIO SIGNAL SYNTHESISER AND AUDIO SIGNAL ENCODER Russian patent published in 2013 - IPC G10L21/02 

FIELD: information technology.

SUBSTANCE: audio signal synthesiser generates a synthesis audio signal having a first frequency band and a second synthesised frequency band derived from the first frequency band, and includes: a patch generator, a spectral converter, a primary signal processor and a combiner. The patch generator performs at least two different patching algorithms, wherein each patching algorithm generates a primary signal having signal components in the second synthesised frequency band using an audio signal having signal components in the first frequency band. The patch generator is adapted to select one of the at least two different patching algorithms depending on control information on a first time portion and a second patching algorithm depending on the control information on a second time portion different from the first time portion to obtain the primary signal for the first and the second time portion. The spectral converter converts the primary signal into a primary signal spectral representation. The primary signal processor generates the corresponding primary signal spectral representation depending on spectral domain spectral band replication parameters. The combiner combines an audio signal having signal components in the first group or a signal derived from the audio signal with the primary signal spectral representation or with a further signal derived from the primary signal spectral representation to obtain the synthesis audio signal.

EFFECT: design of a synthesiser which efficiency performs signal conversion and improves quality.

14 cl, 16 dwg