首页> 外国专利> Companding system and method to reduce quantization noise using advanced spectral extension

Companding system and method to reduce quantization noise using advanced spectral extension

机译:使用高级频谱扩展来减少量化噪声的压扩系统和方法

摘要

Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
机译:实施例针对用于减少音频编解码器中的编码噪声的压扩方法和系统。压缩过程通过压缩过程减小了初始音频信号的原始动态范围,该压缩过程使用定义的窗口形状将初始音频信号分为多个段,并使用基于非能量的平均值计算频域中的宽带增益。频域对初始音频信号进行采样,并应用各个增益值来放大强度相对较低的段并衰减强度相对较高的段。然后,将压缩的音频信号扩展回基本原始的动态范围,该原始动态范围应用反向增益值来放大强度相对较高的段和衰减强度相对较低的段。 QMF滤波器组用于分析初始音频信号以获得频域表示。

著录项

相似文献

  • 专利
  • 外文文献
  • 中文文献
获取专利

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