METHOD AND APPARATUS FOR ENCODING SCALABLE WIDEBAND AUDIO SIGNAL

摘要

A method and an apparatus for encoding a scalable wideband audio signal are provided to output an encoding result of an improved layer of a voiced sound signal by encoding an error signal, thereby improving audio quality of the entire voiced sound by encoding a basic layer and the improved layer by a smaller number of bits. A signal analysis unit(400) performs linear prediction analysis about a voiced sound signal(IN) received from the outside to filter. A signal modulation unit(410) modulates the signal filtered in the signal analysis unit. A subtracter(450) outputs an error signal by obtaining a difference between a signal outputted from a post processing unit(440) and the signal modulated in the signal modulation unit. An error signal encoding unit(460) outputs an encoding result(EN_2) of the improved layer by encoding the error signal outputted from the subtracter.