METHODS AND APPARATUSES FOR ENCODING SIGNAL AND DECODING SIGNAL AND SYSTEM FOR ENCODING AND DECODING

摘要

The embodiments of the present invention discloses a method and apparatus for encoding signal and decoding signal and a system for encoding and decoding, wherein the method for encoding signal includes the steps of: performing classification judgement process on the high frequency band signal in the input signal; according to the result of classification judgement process, adaptively encoding the high frequency band signal; outputting a code flow comprising the code of the low frequency band signal in the input signal, the adaptive code of the high frequency band signal and the result of classification judgement process. The present embodiments performs classification judgement process on the high frequency band signal and according to the result of classification judgement process, performs adaptive encoding or adaptive decoding, so that the quality of a speech output signal is increased.