Meanwhile, by polyphase factorization, it was proved that the low-pass filter satisfies perfect reconstruction condition.
同时借助多相位分解，证明了多通道低通滤波器满足完全重构条件。
Firstly, the theory of multi-channel derivative sampling is described and the compact perfect reconstruction condition is given.
首先阐明了多阶微分采样的原理，给出了更为简洁的完美重构条件。
The traditional method is that the impulse response of filter can be gotten by optimization under the perfect reconstruction condition. The performance of filters is not very good.
传统的研究方法是在满足滤波器组完全重构的情况下通过寻优的方法得到滤波器的冲击响应，所得到的滤波器性能较差。
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