On Fri, Dec 17, 2010 at 10:23:10PM +0800, wangxiang wrote : > highpass audio-filter, hope to be useful As I already told you, you should change the Copyright years, and you should make Q, F0 and dBGain configurable. Best Regards, -- Jean-Baptiste Kempf http://www.jbkempf.com/ +33 672 704 734