[sdiy] lookup table as expo converter

[Ingo Debus]

Am Montag, 24.05.04 um 19:57 Uhr schrieb Tim Ressel:

> My first cut would probably use an ATMEL, and use the
> internal ADC for sampling CV and mod inputs. A 120
> note table of values would feed into a
> Numeric-Controlled Oscillator.

What is the resolution of the internal ADC? If it is 8 bit this would 
give you a resolution of half-semitones (or quarter tones, or 50 cent 
steps). Does it make sense to have a voltage input at all then? 
Wouldn't you be better off with just a MIDI input?

The highest ADC resolution I've seen so far on Atmel micros (8051 
compatibles) is 10 bits, and to get this accuracy the uP has to be set 
into idle mode during conversion. My supplier (Reichelt) doesn't carry 
this uP any longer, ack!



Ingo