Hi Stephen, Re (2) I use a $15 Logitec USB headset and my laptops internal sound card. I had a laptop that booted into Linux and Windows which was convenient but it's fan has died so I can't test Win32 ATM.
Yes one sound card using left and right was talked about some time ago and may be useful. Thanks, David On Mon, 2014-05-05 at 03:21 -0700, Stephen Hurd wrote: > David Rowe wrote: > > The tests I would be inclined to do are: > > > > 1/ Test new (and old, i.e. combined audio streams) functionality on > > Linux and Win32. > > > > 2/ Look for good quality scatter diagram (nice tight spots) on full > > duplex analog loopback (connect the mic (from radio) to speaker (to > > radio) using patch lead). > > > > 3/ Separate streams may have some impact on the demod timing estimation. > > Take a look at the timing estimation plot, look for loss of sync, and > > measure BER in analog loopback for a few minutes (should be 0). There > > is a test mode that enables test data frames to check BER. > > #1 is easy enough, but I think for #2 and #3, I need to get another > sound device (I'll pick up a couple cheap USB devices) to test > properly. My sound card has three sets of connections, so my use so far > has presumably been using the same clock for all IO. I'll likely wait > and pick them up at Hamvention since it's about the same wait time as > shipping from Hong Kong, and I'm the only person so far who wants this > feature. > > If it all works out, I just thought of a new mode that may be worth > playing with... using left/right channels to enable full duplex use with > a single sound card. Not sure if sound cards generally have enough > isolation between the channels though, so it may not work very well in > real life. This would likely end up waiting until I build a new rig > interface though. > > ------------------------------------------------------------------------------ > Is your legacy SCM system holding you back? Join Perforce May 7 to find out: > • 3 signs your SCM is hindering your productivity > • Requirements for releasing software faster > • Expert tips and advice for migrating your SCM now > http://p.sf.net/sfu/perforce > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Is your legacy SCM system holding you back? Join Perforce May 7 to find out: • 3 signs your SCM is hindering your productivity • Requirements for releasing software faster • Expert tips and advice for migrating your SCM now http://p.sf.net/sfu/perforce _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
