[asterisk-users] Codec Conversion

[Jeff Brower]

Miguel-

> El 05/08/10 14:50, Tim Nelson escribió:
>> ----- "michel freiha" <michofr at 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