[sdiy] VC variable bit-rate audio digitizer? help!

[Sebastian Kuehnl]

The Blacet/ Wiard wave-modules store nonlinear transform functions on
EEPROMs a in configuration of 256 functions (or 'waves') consisting
of 256 samples each, and I suspect that with different addressing,
and accepting a huge decrease of storage for individual functions of
course, they could be reconfigured to convert to higher bitrates?

So obviously there are various known ways to do plain bit rate
conversion. A much more interesting module, in my opinion, would be
one that could vary the amplitude quantization _linearly_ from 2
states to some hi-fi number of states. Is THAT feasible?

S. Kuehnl

--- Jay Schwichtenberg <jays at aracnet.com> schrieb:
> By using an audio CODEC (less than $5) and a PIC (or any other high
> speed
> uC) you could do this easily. With a PIC or uC there would be a lot
> of
> software work involved. A low end DSP could handle this too. One
> with a I2S
> interface (standard audio ADC/DAC interface) would make the job
> easy.
> 
> There are a few issues.
> 
> First the PCB would have to be done and done right. Mixing analog
> and
> digital stuff on a board and getting high quality audio out can be
> a pain.
> 
> Next use multi bit audio converters. They are more tolerant to
> clock jitter
> and IMHO sound better (ie more transparent).
> 
> Get the converter clocking as tight as you can get it. Converters
> are pretty
> sensitive to clocking/timing deviations.
> 
> Jay
> 

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