On 11/05/2012 10:18, David Rowe wrote: > 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. >
Beware that the AC97 codec (ie any internal sound card from a few years back or older) almost exclusively runs at 48Khz and will only work reliably at that rate. To convert to any other frequency there will usually be an absolutely awful resampler implementation which will cause all kinds of wierd (nonlinear) artifacts. As such for anything requiring even reasonable fidelity and a built-in soundcard, first check the specs, but then if in doubt run at 48Khz and use your own resampler to get the frequency you want. Sox some many years back had a mediocre resampler, but as of some (quite a few now?) years it's implementation is top notch. There are plenty of decent off the shelf resampler libraries if you don't want to write your own code - I quite like libsrc (secret rabbit code..) Good luck Ed W ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
