Hi Rick, > What is your idea about the 12.8 kHz that I am working on? This was > chosen to exploit the FFT to its fullest, given the current packet > frequency. (With 16 kHz your could also achieve that at one packet per > 20 ms, of course.)
I haven't checked out yr patch (as I am trying to stay focussed on the 1400 bit/s work) so I don't fully understand exactly what you have changed. However from reading yr posts above you are proposing changing the sample rate to 12.8 kHz, while keeping the frame rate constant? I'd be tempted to scale some constants (e.g. N, NW, MAX_AMP & M in defines.h) so that they are the same length in ms at the new sample rate and see how that sounds on some wideband input samples. The size of the windows wrt to the FFT size is not critical. I'd test the unquantised codec using c2sim at the 10ms frame rate first to make sure that sounds OK and nothing is broken. You could then try LPC modelling with different LPC model orders. Cheers, David > I'll admit having a hidden agenda on power-of-two-FFT -- I am trying to > exploit the fact the Codec2 reuses 3/4 of the samples in each run of the > FFT. I've documented the _premature_ ideas here: > > http://0cpm.org/codec2/speedup/#future-speedup-quarterback-fft > > > I am not sure what's required to make very high pitched voices (such as > > children) more intelligible through codecs. Having said that I know my > > 6 year old can be hard to understand through a mobile. > > I would love to compare narrow/wideband on such a voice. Could I have a > small sample to work on? 64 kHz sample rate gives the fairest comparison, > but 48 kHz and 44.1 kHz should work well enough. Let me know if you don't > want me to use it in public demo's though. > > > Cheers, > -Rick > > ------------------------------------------------------------------------------ > Keep Your Developer Skills Current with LearnDevNow! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-d2d > _______________________________________________ > Freetel-codec2 mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
