Bit rate scalable audio data stream generation method

摘要

Method involves compressing audio data stream in a core codec (100) by determining core parameter (102). The coding is improved in at least one following enhancement stage (110), controlled by the core parameters, such that a vector coding takes place in the enhancement stage. The core parameters control the selection of code books (P) The audio data stream (130) is transformed (105), as is a synthesized audio signal (104), formed by the core codec. The transformed synthesized audio signal (106) is linked to the transformed audio data stream. The linking parameters are transmitted to the receiver. An independent claims describe the generator of bit rate scalable audio data stream. Independent claims are also included for the following: (1) an apparatus for generating the bit rate scalable audio data stream with a core codec; (2) a data carrier on which control information are stored.