Amateur radio services around the world disallow the transmission of music. Thus, for these applications Codec2 provides the additional feature of always demusicifying your audio stream :-)
73, Bruce VE9QRP On Sun, Jun 3, 2012 at 2:17 AM, Jean-Marc Valin <jmva...@jmvalin.ca> wrote: > Hi, > > As David pointed out, please read my blog post on the quantizer: > http://jmspeex.livejournal.com/10446.html > The fact that it combines VQ and prediction means that there is no > precise "resolution" on the pitch. The pitch error depends not only on > the frequency, but also on how continuous the original pitch is. > > In general, I would say that one shouldn't expect codec2 to sounds > anything other than atrocious on music. That's just not what vocoders > are meant to code and it's not worth making voice worse just to make > music slightly less awful. > > Cheers, > > Jean-Marc > > On 12-06-01 05:49 AM, Rick van Rein wrote: >> Hello Gullik, >> >>> I feel you are into something here. From what I believe, it is not >>> the absolute pitch though (unless you have absolute hearing ?? ) >>> but the relation between various frequencies that is percieved >>> as on key or false. >> >> Indeed. Still, there is a need to use absolute frequencies >> for a codec, so there's nothing wrong with supporting the >> absolute values by incorporating the 440 Hz and vary around >> it. >> >>> How would this impact the necessary math? Working from sampling, discrete >>> time, what is the "natural" result in frequency? >>> >> David already corrected me that the current Codec2 actually >> uses a log scale, which is good. I am going to look into it to see >> if the steps of the scale work, or if mild modifications would >> make it work better for music, if needed. (And I am checking up >> on non-Western musical scales.) >> >> >> Cheers, >> -Rick >> >> ------------------------------------------------------------------------------ >> Live Security Virtual Conference >> Exclusive live event will cover all the ways today's security and >> threat landscape has changed and how IT managers can respond. Discussions >> will include endpoint security, mobile security and the latest in malware >> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >> _______________________________________________ >> Freetel-codec2 mailing list >> Freetel-codec2@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> >> >> > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Freetel-codec2 mailing list > Freetel-codec2@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freetel-codec2 -- http://ve9qrp.blogspot.com ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
