[vorbis-dev] Monty on holiday

[Willmore, David VS Central]

        Steve Underwood said:
> This is a strategy common to every digital voice radio system I have seen.
> I
> believe it is also used by the digital stereo broadcast radio, and digital
> TV
> systems. In some systems the important things (e.g the MS bits of the
> energy
> value) have quite massive amounts of error correction assigned to them,
> while
> some other bits have none.
> 
> Monty asked a while ago if anyone had experience with fixed length VQ code
> words versus variable length. I suspect there has been very little
> research on
> this. Most voice and video coders have been designed either for broadcast
> (e.g.
> GSM) or usuable for broadcast (e.g. MPEG2). The need for rapid recovery
> from
> massive channel errors pretty much says that all blocks must be equal
> size, and
> the nature of most channels says the bit rate should also be constant.
> That
> means people usually only bother to investigate the best fixed length VQ
> code
> book.
> 
Okay, before I say anything too stupid.  Could someone point me to a
reference for how the current VQ scheme works.  (*mumble* or maybe what VQ
even means.....)

Cheers,
David

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