[sdiy] dumb wavetable question

[Michael Zacherl.]

On Feb5, 2011, at 23:10 , Olivier Gillet wrote:

>> Why not clock the wavetable with an analog clock driven by a conventional
>> expo converter?  Of course, the tracking would only be as good as the
>> exponential converter, but the wavetable could now be clocked with a plain
>> old binary counter, and the frequency would always be equal to the analog
>> clock frequency divided by the number of wavetable samples.  Since it's
>> analog, it could be glided and detuned smoothly, just like any other VCO.
>> Of course, you'd still need a MIDI-to-CV converter to control it digitally,
>> but that could be built in.
> 
> Or even simpler : use an ideal sawtooth VCO, scale it to 0-5V, pass it
> into an 8-bit parallel ADC, and feed the 8-bits of ADC output as an
> address to an eeprom (the other bits being controlled by the wavetable
> selector). Bonus : any defect in the sawtooth turns into lovely phase
> distortion.
> 
> I bet that's what all the "wavetable player" modules do. In this case
> it sounds more like table-based waveshapping...

and that's, BTW, exactly the way how one would read samples from a table in Pure Data and Max/MSP,
utilising the [phasor~] object, a ramp signal generator.
;-)
Michael. 


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