METHOD AND DEVICE FOR THE HIERARCHICAL CODING OF A SOURCE AUDIO SIGNAL AND CORRESPONDING DECODING METHOD AND DEVICE, PROGRAMS AND SIGNAL

摘要

The invention relates to a method and device for the hierarchical coding of a source audio signal and to the corresponding decoding method and device, programs and signal. More specifically, the invention relates to a method for the hierarchical coding of a source audio signal in the form of a data stream (200) comprising a base level (207) and at least two hierarchical enhancement levels (208, 209, 210, 211), each of said levels being arranged in successive frames. According to the invention, at least one frame of at least one enhancement level (208, 209, 210, 211) has a shorter duration than that of at least one frame of the base level (207). Moroever, at least one datum representative of an order used for a set of frames corresponding to the duration of at least one frame of the base level (207) is inserted into the data stream.