谁帮我写一个基于DSP的小波滤波算法的程序

参考代码：
/* Simple implementation of Biquad filters -- Tom St Denis
*
* Based on the work

Cookbook formulae for audio EQ biquad filter coefficients
---------------------------------------------------------
by Robert Bristow-Johnson, pbjrbj@viconet.com a.k.a. robert@audioheads.com

* Available on the web at

http://www.smartelectronix.com/musicdsp/text/filters005.txt

* Enjoy.
*
* This work is hereby placed in the public domain for all purposes, whether
* commercial, free [as in speech] or educational, etc. Use the code and please
* give me credit if you wish.
*
* Tom St Denis -- http://tomstdenis.home.dhs.org
*/

/* this would be biquad.h */
#include <math.h>