Patent ID: 8731948
Filing Date: 2014-05-20
Classification: G10L

Abstract:
1. An audio signal synthesizer for generating a synthesis audio signal comprising a first frequency band and a second synthesized frequency band derived from the first frequency band, comprising: a patch generator for performing at least two different patching algorithms, wherein each patching algorithm generates a raw signal comprising signal components in the second synthesized frequency band using an audio signal comprising signal components in the first frequency band, and wherein the patch generator is adapted to select one of the at least two different patching algorithms in response to a control information for a first time portion and another of the at least two different patching algorithms in response to the control information for a second time portion different from the first time portion to acquire the raw signal for the first and the second time portion outside of a spectral domain; a spectral converter for converting the raw signal for the first and the second time portion from outside of a spectral domain into the spectral domain to acquire a raw signal spectral representation for the first and the second time portion; a raw signal processor for processing the raw signal spectral representation for the first and the second time portion in response to spectral domain spectral band replication parameters to acquire an adjusted raw signal spectral representation for the first and the second time portion; and a combiner for combining one of the audio signal comprising signal components in the first band or a signal derived from the audio signal with one of the adjusted raw signal spectral representation or with a further signal derived from the adjusted raw signal spectral representation to acquire the synthesis audio signal, wherein at least one of the patch generator, the spectral converter, the raw signal processor, and the combiner comprises a hardware implementation.