Patent ID: 6766293
Filing Date: 2004-07-20
Classification: G10L,H04B

Abstract:
A method for signalling a noise substitution when coding an audio signal, comprising the following steps:converting a time-domain audio signal into a frequency domain to obtain spectral values; grouping the spectral values together to form groups of spectral values, each group having assigned side information, the side information having a defined code book number place for receiving a code book number; detecting whether a group of spectral values is a noisy group; if a group is not noisy, allocating a code book from a plurality of code books for a redundancy coding of the non-noisy group, the code book allocated to the group being referred to by means of a code book number, the code book number being inserted in the defined code book number place of the side information for the non-noisy group; and if a group is noisy, allocating an additional code book number, which does not refer to a code book, to this group to signal that this group is noisy and is therefore not redundancy coded, the additional code book number being inserted in the defined code book number place of the side information for the noisy group.