Vocoder Techniques

Abstract: There is disclosed and audio generator (10), configured to generate an audio signal (16) from a bitstream (3), the bitstream (3) representing the audio signal (16), the audio signal being subdivided in a sequence of frames, the audio generator (10) comprising: a first data provisioner (702) configured to provide, for a given frame, first data (15) derived from an input signal (14); a first processing block (40, 50, 50a-50h), configured, for the given frame, to receive the first data (15) and to output first output data (69) in the given frame, wherein the first processing block (50) comprises: at least one preconditioning learnable layer (710) configured to receive the bitstream (3), or a processed version (112) thereof, and, for the given frame, output target data (12) representing the audio signal (16) in the given frame; at least one conditioning learnable layer (71, 72, 73) configured, for the given frame, to process the target data (12) to obtain conditioning feature parameters (74, 75) for the given frame; and a styling element (77), configured to apply the conditioning feature parameters (74, 75) to the first data (15, 59a) or normalized first data (59, 76'); wherein the at least one preconditioning learnable layer (710) includes at least one recurrent learnable layer.

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