Emax

hmmm.... but then again.. if the compressed format is NOT PCM.. then how
does EMXP work with writing wave files to disk? 

unless data format on disk is different to data format in RAM......

but then a disk only uses 512k of space, too.
:-)


interesting can of worms we've opened here.


On Thu, 23 Jul 2009 13:36 +1000, "Julian" <jujulilianan@...>
wrote:
> actually - we're all wrong, according to my emax service manual...
> :-)
> 
> it talks about the compression algorithm, and this algorithm DEFINITELY
> is not just companding (apparently that was E1?) I always thought it was
> digital companding in the emax.... would love to find where I read that
> now!
> 
> it is also definitely not packing 12 bit sample words that come from the
> A/D and to the D/A into bytes or 16 bit words. apparently the e-chip
> actually compresses and decompresses PCM data into something else. from
> the wording of the manual, it sounds like some kind of sample-sample
> difference function.
> 
> they claim that that with this compression, they can represent 16 bits
> of data in approximately 8 bits of memory. And that although it's not
> 100% constant for every given sample, they claim they get a compression
> ratio with the e-chip of around 2:1.
> 
> 
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