Thanks for you reply I have a link to site which as Demodulation code for all formats. However I do not fully understand it the link is http://www-users.cs.york.ac.uk/~fisher/software/modem/ What I require is to run this software on a Handheld Pc and to demodulate the data in real time. Hope this is of help Regards Max

can any one tell me how I can demodualate v22.bis modem data via software