Re: [AVT] RE: <draft-ietf-avt-rtp-vmr-wb-03.txt>: sampling rate

[Qiaobing Xie <Qiaobing.Xie at motorola.com>]

Hi, Colin,

Colin Perkins wrote:

<snip>
> > Not that such things exist currently, but playing devil's advocate,
> > one could create a codec that takes a variable-sampling-rate input
> > depending on current conditions.  (Similar to video codecs that vary the
> > frame rate, resolution, and/or bitrate within a stream.)
>
> Sure, one could. I don't think it would be a good idea though: the 
> convention that the sampling rate equals the timestamp rate is very 
> helpful when building multi-format systems.

The practical need in 3GPP2 (and possibly other systems) to feed mixed sampling rate input 
(depending on conditions in the call flow) to vmr-wb codec in a single session has already 
been explained in this discussion. I think it is quite equivalent to the scenario depicted 
by Randell.

regards,
-Qiaobing


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