A SYSTEM FOR CODING A HIERARCHICAL AUDIO SIGNAL, A METHOD FOR CODING AN AUDIO SIGNAL, COMPUTER-READABLE MEDIUM AND A HIERARCHICAL AUDIO DECODER

摘要

System encoding the hierarchical audio signal is at least a first band expansion layer to expand the core coding module, the first frequency band using the parameters coded in the second frequency band or broadband by analysis using a composite in the band It includes. According to the invention, the system also includes a wideband audio coding quality enhancement layer based on a transform coding using a spectral parameter obtained from the bandwidth extension layer. The invention is applicable to transmitting speech and / or audio signals on a packet network.