A Novel Embedded Speech and Audio Codec Based on ITU-T Recommendation G.722.1

摘要

This paper describes an embedded speech and audio codec which is based on ITU-T Recommendation G.722.1;it can process 7 kHz bandwidth speech and audio signal at scalable bit rates.Based on the G.722.1 of ITU-T,this algorithm adds two modules: the energy ordering of sub-band and the processing of bit-stream truncation.Furthermore,it does some modification on the categorization and noise-fill modules.It makes sure that the codec could produce embedded bit-stream,so this codec had more robustness in the transmission.The test results by ITUT PESQ show that this codec has good performance as G.722.1 at the same bit-rates.