[sdiy] oscillator auto calibration

[jean-pierre.desrochers at ville.quebec.qc.ca]

Good point Colin,
But speed is an important factor..
specially in high frequencies period reading.
I though about calculating instead of lookup
table but I chose the former.
And a prescaler will slow down period reading
specially in low frequencies.

-----Message d'origine-----
De : Colin f [mailto:colin at colinfraser.com]
Envoyé : 8 mai 2007 09:43
À : synth-diy at dropmix.xs4all.nl
Objet : RE: [sdiy] oscillator auto calibration


 
> The serial EEPROM is a 4K X 16bits so it gives
> 32 steps between each semitones.
> 32steps X 12semitones X 8octaves = 3072 words (16bits)

Why do you need a lookup for each octave ?
Just multiply or divide the table for one octave by factors of two.
You may not even need to do that if the timer has a suitable prescaler.

Cheers,
Colin f


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