Research on Signal Extended Methods in Wavelet Transform
小波变换中的信号边界延拓方法研究*

Discrete signal boundary extended methods in wavelet transform are studied. The length of signal in discrete wavelet transform varies with different signal filter bank. All kinds of extended method and its mathematic expression are detailedly described. Based on sine signal, different extended methods have different results after wavelet transform. This paper discusses these results and analyzes detecting the local extremum of signal. A series of experimental results and some important conclusions are acquired.