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有限长度的信号通过滤波器造成信号长度扩展或截断失真。文中分析了对称延拓对分析／合成系统的影响，提出了子带编码中的信号优化对称延拓方法及滤波器相移限定，在不扩展信号长度的情况下得到了延时为０的完全重构的信号。
A finite length of signal propagates through the filter causing signal length to be extended or truncated. In this paper, we analyze the influence of symmetric extension on the analysis / synthesis system, and propose a symmetrical continuation method for signal optimization and filter phase-shift limitation in subband coding. We obtain the complete delay of 0 without extending the signal length Reconstruction of the signal.