An Improved Method of Implementing Continuous Wavelet Transform Using Switched-Current Circuit
LONG Jia-le1,2, HE Yi-gang2, ZHANG Jian-min2
1. School of Informatics, Wuyi University, Jiangmen 529020, China; 2. College of Electric & Information Engineering, Hunan University, Changsha 410082, China
Abstract：An improved method of implementing continuous wavelet transform using switched-current (SI) circuit is proposed.Trapezoid formula is used to approach numerical integration,and according to this principle,a bank of bandpass filters are improved to approximate the continuous wavelet transform,and implement these filters with SI circuit.The improvement in error reduction is analyzed in detail and we can see clearly the advantages.As an example,the eight channels of Marr wavelet are realized by the biquadratic filters of SI circuit,and the design course and the simulation result are provided,which indicate the feasibility of the improvement.
龙佳乐, 何怡刚, 张建民. 用开关电流技术实现连续小波变换的改进方法[J]. 信息与控制, 2007, 36(4): 441-444.
LONG Jia-le, HE Yi-gang, ZHANG Jian-min. An Improved Method of Implementing Continuous Wavelet Transform Using Switched-Current Circuit. Information and control, 2007, 36(4): 441-444.
Edwards R T,Cauwenberghs G.AVL SI implementation of the continuous wavelet transform[A].Proceedings of the IEEE International Symposium on Circuits and Systems[C].Piscataway,NJ,USA:IEEE,1996.368～371.
[2]
Lin J,Ki W H,Edwards T,et al.Analog VLSI implementations of auditory wavelet transforms using switched-capacitor circuits[J].IEEE Transactions on Circuits and Systems,1994,41 (9):572～583.
[4]
彭玉华.小波变换与工程应用[M].北京:科学出版社,1999.
[8]
Hughes J B,Macbeth I C,Pattullo D M.Second generation switched-current signal processing[A].Proceedings of the IEEE International Symposium on Circuits and Systems[C].Piscataway,NJ,USA:IEEE,1990.2805～2808.
