[sdiy] Vector-based ADC/DAC?

[René Schmitz]

Hi Jay,

> It would be basically consist of using a high speed ADC to convert audio
> vector curves, sort of an EPS file for sound recordings. Then using what I
> can best describe as a "digitally voltage-controlled high speed variable
> slope analog envelope generator" as a sort of DAC. Excuse me if my idiocy in
> this field is showing, but wouldn't that then eliminate all quantization
> that is inherent in digital recordings?
> 
> Is this even possible in real time? Is it possible as a DIY project?
> 
> Just thinking out loud...


In a certain sense what you have in mind is similar to delta modulation,
or more refined variants thereoff. Basically you fit a series of linear 
slopes so that the difference between the slopes and your input waveform 
is minimized. However, time has to be quantized, and the slope must be 
somehow also be quantized. This leads to artefacts.
(Often the slope has fairly low resolution, in the simplest form just
one bit indicating up and down.) 

Cheers,
 René

--
Sig mysteriously missing.