一CQMFB，低通滤波器H0 (z)来自一半带滤波器。该半带滤波器的长度为47，通带截至频率ω_p = 0.42π，试给出H0 (z)，H1(z)，G0(z)，G1(z)的幅频响应，单位抽样响应并画图。试着产生一信号，它由两个正弦加白噪声组成，一个在低频，一个在高频，正弦的频率及和白噪声的信噪比自己给定。试用所设计的滤波器组对该信号进行分解和重建。比较重建后的效果，并对结果继续进行分析。-A CQMFB, low-pass filter H0 (z)　half band filter.The half band filter length of 47, passband by frequency = 0.42 PI, try to give H0 (z), H1 (z), G0 (z), the amplitude frequency response of G1 (z), unit sample response and drawing.Try to generate a signal, it is composed of two sine added white noise, one is in low frequency, one in high frequency, the frequency of the sinusoidal and white noise and the signal-to-noise ratio of a given himself.Trial designed for the signal decomposition and reconstruction filter group.Comparing the effect of reconstruction, and continue to analysis the results.