Hello Jim, Octave is a free version of Matlab.
Cheers, David On Sun, 2012-10-28 at 02:16 -0400, Jimmy Carter wrote: > Hi Bill, > > Thanks, and yeah I definitely agree that would be a lot of testing! I > considered doing a simple difference of the individual sample values > to give a rough estimate at the difference, but the metric you suggest > sounds much better. > > I don't have matlab, but I don't mind implementing that equation in C. > Seems like it could become useful. I'll post back to the list when I > have a program and values for those. > > 73 KG4SGP - Jim > > > > On 10/26/2012 07:05 AM, Bill Cowley wrote: > > > Hi Jim, > > > > > > A nice demo! I agree that listening to the results is going to be > > the best option for measuring the bit sensitivities. But if there's > > lots of bits, over different samples, perhaps tested with different > > channel codes, then that's a lot of listening! > > > > > > So it might be interesting to test a quantitative measure of the > > effect of different bit errors and see how that compares to the > > subjective test. Spectral distance measures can be used in this > > situation eg > > see http://en.wikipedia.org/wiki/Log-spectral_distance The aim > > would be to measure the average distortion, in terms of power > > spectral differences, over time periods that match the variations in > > typical speech. Errors could be introduced randomly and used to rank > > bit sensitivities, for a given BER. > > > > > > There's various code around > > eg > > http://www.mathworks.com.au/matlabcentral/fileexchange/9998-log-spectral-distance. > > I've used other spectral distance measures but not this one. Not sure how > > well it would work, but could be useful for coarse tuning of the error > > correction ... > > > > > > Cheers, Bill > > > > On 26 October 2012 19:14, David Rowe <[email protected]> wrote: > > Hi Jimmy, > > > > Very good work .... nice to be able to hear the effect f > > each bit > > getting messed up. > > > > Cheers, > > > > David > > > > On Fri, 2012-10-26 at 03:58 -0400, Jimmy Carter wrote: > > > Hello again, > > > > > > I went ahead and tried to make it a little easier for > > others to help > > > with the subjective measurements. > > > > > > A small write-up can be found at > > http://kg4sgp.com/codec2-bit-study.html > > > . This page has links to audio with corresponding bit > > corruptions. From > > > the listening I've done there is definitely a difference > > in the > > > sensitivity of the different bit types. > > > > > > Please excuse the simple site. As you can probably tell > > it's not a > > > priority of mine. > > > > > > KG4SGP - Jim > > > > > > > > > ------------------------------------------------------------------------------ > > Everyone hates slow websites. So do we. > > Make your web apps faster with AppDynamics > > Download AppDynamics Lite for free today: > > http://p.sf.net/sfu/appdyn_sfd2d_oct > > > > > > _______________________________________________ > > Freetel-codec2 mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 > > ------------------------------------------------------------------------------ > WINDOWS 8 is here. > Millions of people. Your app in 30 days. > Visit The Windows 8 Center at Sourceforge for all your go to resources. > http://windows8center.sourceforge.net/ > join-generation-app-and-make-money-coding-fast/ > _______________________________________________ Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ WINDOWS 8 is here. Millions of people. Your app in 30 days. Visit The Windows 8 Center at Sourceforge for all your go to resources. http://windows8center.sourceforge.net/ join-generation-app-and-make-money-coding-fast/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
