V G wrote: > My mistake. Forgot to mention that the microphone is USB based. The > filter needs to be through software unless I can make an active filter > with a PIC32 with USB host. Or you can hack into the analog signal inside the microphone unit. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .