滤波器阶数越高，越节省资源。
从OFDM系统子载波正交性要求出发，讨论了数字成形滤波器阶数有限效应。
In view of orthogonality between subcarriers of OFDM system, effect of the finite order of digit shaping filter is discussed in this paper.
通过对回声抵消的实际应用环境进行分析，提出一种新的动态改变自适应滤波器阶数的算法。
By analysing the actual room acoustic environments, this paper presents a novel algorithm for acoustic echo cancellation, it can dynamically change the length of the adaptive filter order.
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