On 30 November 2011 11:18, Timothy B. Terriberry <tterr...@xiph.org> wrote: >> I might be being naive here (it's a long time since I sat my digital >> signals classes) but if some bits are more important than others >> wouldn't that mean that there is some entropy in the signal which can >> be removed to get better compression? > > No. > ... > Consider, for example, a single bit that's true for exactly 50% of the > frames (so the Shannon theorem tells you there's no better way to > represent it than one bit), but selects between different coding methods > (for example, this could represent the voiced/unvoiced decision, though > codec2 does not use that parameter this way). If the bit is set, you > decode one set of parameters using one set of codebooks, and if it's > unset, you decode another set of parameters using a completely different > set of codebooks. If you get that bit wrong, then your interpretation of > all the remaining bits will be wrong, and you'll decode complete garbage. >
Aah, I understand. Thank you for that explanation! Regards, Dan ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-novd2d _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
