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 > > On 10/26/2012 01:03 AM, Jimmy Carter wrote: > > Hi all, > > > > I'm new to the list, but am interested in helping out with codec2 and > > this seemed like the perfect thing to start with. > > > > I started writing a program to cause bit errors at specified locations > > in the frames in order to judge their importance. Got it working just > > a bit ago and decided I would share it here. > > > > The C code can be found at: > > http://www.kg4sgp.com/code/errbit.c > > > > Its not the cleanest/prettiest code, but it works :) . > > > > It can be piped and I have used it in-line with some of the examples. > > If everyone is interested I would be happy to take some of the sample > > audio files and encode them with bit errors at different positions > > across the different bit rates. I could write that up and post it to > > my site, or where ever you guys would like. > > > > Already it can be seen that certain bits are very important! > > > > Looking forward to your replies! > > > > KG4SGP - Jim > > > > On 10/24/2012 06:17 PM, David Rowe wrote: > >> Hello, > >> > >>>> Given what Jean-Marc wrote about the first VQ index, it probably rates > >>>> higher than energy. > >>> If David and/or Steve can confirm this; it makes sence to incorperate > >>> this in the search for a good interleaver. > >> It's best to test the relative sensitivity of the different codec > >> parameters. So set up the FEC/interleaving so that we can evaluate > >> different schemes, apply say 1-5% random errors and listen to the > >> results for a few test sentences. > >> > >> The index assignment Jean-Marc suggested may provide as much improvement > >> as FEC. > >> > >> Cheers, > >> > >> David > >> > >> > >> > >> ------------------------------------------------------------------------------ > >> > >> > >> 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 > > > > > ------------------------------------------------------------------------------ > 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 ------------------------------------------------------------------------------ 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
