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
