Steve- > On 08/06/2010 05:40 AM, Jeff Brower wrote: >> Miguel- >> >>> El 05/08/10 14:50, Tim Nelson escribió: >>>> ----- "michel freiha"<mich...@gmail.com> wrote: >>>>> Dear Sir, >>>>> >>>>> I tried to convert ilbc to ulaw and get the same result...Bad Voice >>>> Quality >>>>> Regards >>>>> >>>> Again, iLBC is poor quality to begin with. You can't take a poor audio >>>> sample and make it better by converting it to a codec with better >>>> 'resolution'. An audio sample full of robot voice is going to sound >>>> like the same robot voice even if you transcode it to a better quality >>>> codec, whether that is G.729, G.711u, or the latest 'HD Voice' codecs. >>>> >>>> --Tim >>> This just made me remember some comment on the iax.conf sample file... >>> >>> disallow=lpc10 ; Icky sound quality... Mr. Roboto. >> LPC10 is a very old codec, from early 1980s. LPC10 doesn't do a good job >> with pitch detection so it tends to have a >> 'robotic' sound. With advent of MELPe, anyone needing bitrates 2400 or less >> should not be using LPC10. >> >> -Jeff > MELPe is patent encumbered,
Not if used for govt/defense purposes. For commercial-only purposes, TI will waive royalty fees if their chip is used in the product. It would have been nice if Digium had considered the many advantages of using a DSP pioneer such as TI before putting a Mindspeed chip on their TC400B card. > so there is still a place for LPC10 [...] I haven't seen an LPC10 implementation with MOS higher than 2.5. Due to its age and expiration of patents, LPC10 might be a basis for a 2400 bps open source codec. But enormous improvement would be needed to come close to MELPe performance. -Jeff -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
