机构地区: 广东外语外贸大学
出 处: 《电视技术》 2009年第5期36-39,共4页
摘 要: DRA是一种新的音频编解码标准,其在每声道64Kbit/s时重建的音质达到ITU-R规定的"人耳不可识别损伤"的主观音质评定。研究了DRA的编码与解码原理,在对解码算法进行了优化的基础上,设计并实现了基于PXA270平台的DRA实时解码器。主观听音测试结果表明,该解码器音质良好,满足实时解码应用的要求。 Digital Rise Algorithm(DRA) is a brand new audio codec specification.According to ITU-R evaluations of multichannel audio codecs,the impairment grade of DRA codec is imperceptible,when 64 Kbit/s per channel.The DRA encode specification and decode specification are researched.The key decode module of DRA is optimized,and finally a PXA270 platform based DRA real-time decoder is designed.According to the evaluation,the audio playback sound quality is good enough and and the design fits the real-time requirement.