Patent ID: 7720676

Claim:
A method of encoding an audio signal, in which a first part of the frequency spectrum of the audio signal is encoded with a spectral band limiting encoder referred to as a core encoder and in which the complementary part of the frequency spectrum of the audio signal is encoded with an extension encoder, distinct from the core encoder, wherein at least a part of said first part of the spectrum encoded with the core encoder is also encoded with the extension encoder, the method comprising: determining at least one cut-off frequency of the core encoder by an adjustment module taking into account the load of the core encoder, determining said part of said first part of the spectrum encoded with the core encoder and the extension encoder using the cut-off frequency determined by said adjustment module, said first part and complementary part overlapping in the proximity of the cut-off frequency, in order to compensate for a possible data loss during the transmission of said part of frequency spectrum encoded with the core encoder, said step of determining at least one cut-off frequency of the core encoder by an adjustment module comprising: determining a frequency margin, said margin being predetermined and stored in a register or be in the form of a variable, from said margin, determining the high cut-off frequency of the core encoder, the low cut-off frequency of the extension encoder, delivering representative information of said low cut-off frequency of the extension encoder, transferring of said information, storing of said information.