作　　者： ; (许憬）; (曾庆煜）;

机构地区： 科技部

出　　处： 《电声技术》 2013年第6期54-57,共4页

摘　　要： 提出了DRA多声道数字音频信号压缩编码算法,由于采用了瞬态局部化的MDCT(Modified Discrete Cosine Transform)消除预回声和基于统计特性的量化指数熵编码码书选择等创新方法,DRA多声道数字音频信号压缩编码算法在较低的算法复杂度下达到了国际先进水平的压缩效率。依据ITU-R BS.1116标准进行的主观听音测试结果表明其达到了标准中定义的"透明音频质量"的要求。 DRA muhichannel audio coding algorithm is presented, which deploys transient-localized MDCT to effectively suppress pre-echo artifacts , statistics-based assignment of entropy codebooks to code quantization indexes, and other new technologies to deliver internationally advanced level of compression ratio at very lower decoder complexity. A series of sub- jective listening tests administered by the Broadcasting Planning Institute under China＇ s State Administration of Radio, Film and Television have established that DRA audio coding standard has achieved ＂transparent audio quality＂ as defined by ITU-R B. 1116 standard.

关 键 词： 多声道数字音频编码 自适应时频分块 量化指数

领　　域： [电子电信] [电子电信]