Hi Peter, Sure any sample rate conversion tool should be fine. Several guys I know who have developed PC-based modems have warned me of sample rate inaccuracies, 48 kHz seems to be the way to go.
Are you running the codec and modem under Windows as well? Interested in feedback from people doing that to track down any cross platform issues. I have had one report of a segfault on fdmdv_demod, but not sure why. I'm interested in receiving sample files (e.g. received modem audio) from people running this over real channels. Next step will be taking a look at what happens over real channels and working out how to make it more robust. Cheers, David On Fri, 2012-05-11 at 09:51 +0100, Peter wrote: > On 11 May 2012 05:24, David Rowe <da...@rowetel.com> wrote: > > If anyone decided to try this over the air pls convert the modulated > > signal sample rate to 48kHz. Sox should be able to do that on the fly, > > or I have C functions in fdmdv.[ch] > > Hi David, > > Great to hear we have some juicy real world potential to test. I'm > sure it's what a lot of us have been salivating for. > > If I did this conversion in say cooledit, on the windows side. Would > that be fine? I am guessing the reason you suggest this is because > many sound cards are unstable at 8Khz (I've seen that HRD underclocks > mine sometimes to 7.98 to get best results). But just checking this > will work fine. > > At any rate I shall run WSPR later see what locations I can be heard > in for a general idea of propagation possibilities, and perhaps > announce a time I'll be sending test transmissions from. Well, after I > go and modify my awesome (hah) speaker wire based antenna. I finally > got my antenna analyzer and found it was actually resonant on 6.4Mhz. > Which is of limited use to me. > > Best regards, > > > Peter. > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
