[asterisk-dev] iLBC packet loss concealment (was: code-cleanup concerns)

[Denis Smirnov]

On Mon, Apr 17, 2006 at 11:19:19PM +0800, Steve Underwood wrote:

>>Transcoding between variants can appear, if we have recordings (for voice
>>prompts) in ultra wideband version (32k), and would play to phones, that
>>support only low-rate codec version (16k).
>>For speex this transcoding cheaper, then uwb<->sln<->wb transcoding.
SU> True. That is a valid situation. However, the computational cost is not 
SU> the major issue. The quality of the converted audio will be far superior 
SU> in a case like the one you mention if its done directly. Decoding and 
SU> recoding low bit rate codecs is really bad news for quality. In the 
SU> Speex case this is avoided completely when a direct rate conversion occurs.

Yes.

Why transcode_via_sln was added, and used by default?

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