This article advanced two methods named cross-spectrum field linearity predict (CSAR) and sub-band decompose methods of AR (SBDAR) to improve this shortcoming.

• 本文针对线性预测算法的这个缺点加以改进,提出互谱域线性预测角度谱估计(CSAR)方法以及子带分解(SBAR)算法。