On Wed, Feb 1, 2012 at 5:57 PM, Chris Long <vk3...@optusnet.com.au> wrote: > the purpose of ham radio"? Surely it isn't the progressive narrowing of > bandwidth to the point where individuality, personality and humanity is > completely eliminated.
Some of us don't have personality and humanity, you insensitive clod! ;) Codec2 already runs at multiple rates. I hope that it's able to accommodate multiple uses. Good quality over weak paths is important. But it is also good if we can have intelligible quality over even miserable paths— what if you are using HF to communicate in a disaster situation and the only antenna you have is available is a poorly placed wire dipole and the only transmitter you have puts out only a few watts? I also don't think that "you can only exchange callsigns, and only then if you have a table of known callsigns to prime the priors for the error correction" is interesting— but there is a large space of interesting bitrates and applications between that and "hifi". One technique which is useful in codec design is to get the intelligible quality rate to the lowest possible— validating that you really have the essential parts right, and then go back and add bitrate for more quality hopefully with the result of getting a better quality/rate trade-off everywhere and not just at the lowest rates. At the highest qualities (and bitrates) a vocoder— even a very smart one like codec2— probably isn't the right thing. Amateurs (at least in the US) have these great big SHF allotments which are oftne under-utilized— if we want to have real "CD quality" conversations, one can easily do so using Opus on 23cm. :) But there will always be some quality compromises on HF— the bandwidth simply isn't there to give all that our ears can take, not without being a spectrum hog. Greg Maxwell (NT4TN) ------------------------------------------------------------------------------ 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 Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
