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一般用途的小波滤波器是不随时间变化的滤波器。文章中我们提出一种新的方法设计双正交小波滤波器,这种滤波器与输入信号是正交的。我们称它为随时间变化的提升小波滤波器(TVLW F)。它的特点是通过改变Sw eldens所开发的提升格式的自由参数使滤波器适应于输入信号的变化。这种滤波器很简单并且几乎是可以完美地重构的。用TVLW F,我们做了心电图数据(ECG)的压缩,这是一种半周期性信号。实践证明时变系统很容易构成。我们提出的方法对数据压缩很有用。
The general purpose wavelet filter is a filter that does not change over time. In this paper, we propose a new method to design biorthogonal wavelet filters, which are orthogonal to the input signal. We call it the Lifting Wavelet Filter (TVLW F) over time. Its characteristic is to adapt the filter to the change of the input signal by changing the free parameter of the lifting format developed by Sweldens. This filter is simple and almost perfectly reconstructed. With TVLW F, we did compression of the ECG data, a semi-periodic signal. Practice has proved that time-varying system is easy to form. The method we propose is useful for data compression.