Homepage of P. P. Vaidyanathan:

http://www.systems.caltech.edu/dsp/ppv/.index.html

Mirror of OpenCouseWare of MIT for China：

http://www.ocw.cn/

Forum of Research and Study:

http://bbs.matwav.com/

Official website of Wavelet:

http://www.wavelet.org/

• Basic functions to realize fundamental manipulations and design filter. (.rar)

• Lecture notes of the short course "Fundamental of Multirate Systems" by Prof. Gordana Jovanovic Dolecek. (PDF)
• Lecture notes on the  wavelet theory in the foreign university. (rar)