首页> 外文期刊>IEEE transactions on audio, speech and language processing >Perceptual coding of narrow-band audio signals at low rates
【24h】

Perceptual coding of narrow-band audio signals at low rates

机译:低速率窄带音频信号的感知编码

获取原文
获取原文并翻译 | 示例
           

摘要

This paper describes a coding paradigm using coding tools based on the characteristics of the human hearing system so as to accommodate a wide range of narrow-band audio inputs without annoying artifacts at low rates (down to 8 kb/s). The narrow-band perceptual audio coder (NPAC) employs a variety of algorithms to account for the perceptually irrelevant parts of the input signal in addition to statistical redundancies. The new algorithms used in the NPAC coder include a perceptual error measure in training the codebooks and selecting the best codewords which takes into account the audible parts of the quantization noise, a perception-based bit-allocation algorithm and a new predictive scheme to vector quantize the scale factors. The NPAC coder delivers acceptable quality without annoying artifacts for most narrow-band audio signals at around 1 bit/sample. Informal subjective tests have shown that the NPAC coder outperforms a commercial low-rate music coder operating at 8 kb/s.
机译:本文介绍了一种基于人类听力系统特性的,使用编码工具的编码范例,以适应各种窄带音频输入,而不会以低速率(低至8 kb / s)干扰人为干扰。窄带感知音频编码器(NPAC)除了统计冗余外,还采用多种算法来解决输入信号中与感知无关的部分。 NPAC编码器中使用的新算法包括:在训练码本和选择最佳码字时的感知错误度量,其中考虑了量化噪声的可听部分;基于感知的位分配算法;以及用于矢量量化的新预测方案比例因子。 NPAC编码器可提供可接受的质量,而不会干扰大多数窄带音频信号(约1位/采样)的伪影。非正式的主观测试表明,NPAC编码器的性能优于以8 kb / s的速度运行的商业低速率音乐编码器。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号