Patent ID: 8498422
Filing Date: 2013-07-30
Classification: G10L,H04S

Abstract:
1. A method of encoding a multi-channel audio signal comprising at least two audio channels, the method comprising the steps of: generating a single channel audio signal from the at least two audio channels, and encoding, using an encoder, the single channel audio signal into a bit stream as an encoded single channel audio signal; generating information from the at least two audio channels allowing to recover with a required quality level the multi-channel audio signal from the single channel audio signal and the information; and combining the information and the single channel audio signal, wherein the generating information step comprises the steps of: determining a first portion of the information for a first frequency region of the multi-channel audio signal using a parameter determining circuit; encoding, using a parameter coder, the first portion of the information into the bit stream as an encoded first portion of the information; determining a second portion of the information for a second frequency region of the multi-channel audio signal using the parameter determining circuit, the second frequency region being a portion of the first frequency region; and encoding, using the parameter coder, the second portion of the information into the bit stream as an encoded second portion of the information, wherein the second portion is differentially coded with respect to the first portion.