基于开关电流电路提出一种用小波滤波器实现小波变换的方法。通过对母小波的一种数值逼近得到小波函数的有理公式,并以Mexican Hat小波为例模拟该逼近过程,用Matlab对逼近过程进行仿真,同时使用开关电流双二次滤波器的级联来实现小波滤波器。从仿真结果来看,二阶巴特沃思低通滤波器用开关电流技术来实现能达到比较理想的效果。
- Abstract:
- Based on switched-current circuit,a wavelet filter which achieved wavelet transform was designed. The wavelet filter uses wavelet transform method, it obtains the rational formula of wavelet function around the mathematical approximation of a mother wavelet. By using Mexican Hat wavelet as an example to simulate the approximation process and using Matlab to simulate,it obtained the wavelet filter by using the biquadratic filters of SI circuit. From the simulation results, second-order Butterworth low-pass filter using switched-current technology can achieve the ideal effect.
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