By introducing the prior information constraint in the objective function, we can solve the ill-posed problem and band-limited problem for the impedance inversion.

通过在目标函数中增加先验知识约束，我们可以解决波阻抗反演的病态问题及带限问题。

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In addition, the stop-band rejection can be further increased by using elliptic filter function which has limited frequency transmission zeros.

另外，在函数类型上使用椭圆函数型，使带外出现有限频率传输零点，进一步提高了带外抑制能力。

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Next, by the orthogonal multiresolution analysis, the necessary conditions of a kind of M-band band-limited orthogonal wavelet function constructed by the scaling function are proposed.

然后利用正交多分辨率分析，给出由该尺度函数构造的一类频带有限的M进制正交小波函数的必要条件。

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