摘要
AAC是MPEG 4标准的音频编码规范 ,为了提高音频数据的压缩率 ,往往忽略了音频中所包含的高频成分 ,只对低频部分进行编码 ,因此AAC解码器设计中高频重建技术对提高音频质量起着非常重要的作用 .本文论述了高频重建技术的原理 ,并采用SBR技术 ,实现了AAC音频编码的高频重建 ,同时性能评测结果表明所实现的AAC +SBR系统满足实际应用的要求 .
Advanced Audio Coding (AAC) is the standard audio coding specification of MPEG-4.As description of AAC audio coding,the high frequency part of audio is always omitted,and only the low frequency part of audio will be coded to enhance the audio compression efficiency.The high frequency reconstruction technology plays an important role in the AAC decoder design to improve the output audio quality.This paper discusses the basic principles of high frequency reconstruction based on spectral bandwidth replication(SBR) technology.The implementation of an AAC decoder with SBR is presented in this paper.Some evaluation results of the implementation show its efficiency of audio decoding.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2004年第F12期189-191,共3页
Acta Electronica Sinica
基金
国家自然科学基金 (No .60 1 730 4 0 )
关键词
高频重建
AAC
SBR
AACPLUS
high frequency reconstruction
advanced audio coding(AAC)
spectral bandwidth replication(SBR)
aacPlus
