Greetings list, I've been having a go at preparing some music on hold from CDs clients have supplied, but quality seems really rather poor over compressed channels (tried g729, GSM and Speex). I've been doing the following:
sox -v 0.15 <filename.wav> -t raw -r 8000 -s -w -c 1 <filename.sln> resample -ql As I understand it, I'm reducing volume to 15% (which sounds about right volume-wise) and downsampling to 8khz, 16-bit mono. I know MoH over compressed links isn't ideal conditions and is never going to be great, but I should be able to at least make it bearable. What's the prevailing opinion on using high and low pass filters? One would assume a phone handset is expected to provide frequency response in human speech zones, and not really much outside that (certainly not the 20hz-20khz one might expect of a CD). Suggestions gratefully appreciated. Regards, Chris -- C.M. Bagnall, Director, Minotaur I.T. Limited For full contact details visit http://www.minotaur.it/chris.html This email is made from 100% recycled electrons _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
