SV: Re: [sdiy] Roland DCOs

[karl dalen]

Interesting thanks for sharing!
Btw its possible to read out from the master
MCU PCB photograph of the 08 which dsPIC was used!
According to 08 manual has highest range of 8khz, 10 octaves.

KD  
> 
> The motor control time base has 15-bit resolution with a 1/4/16/64x 
> prescaler - that should give plenty of frequency accuracy. I've no idea 
> what the dsPIC clock rate is, but assuming it's running near it's 
> maximum, 40MHz is a good ballpark. Given that, you get the following 
> resolution at the various prescaler settings:
> 
> 1:1 - Range is 2441Hz and up. Resolution is ~0.15Hz at 2441, ~2.3Hz @ 10kHz.
> 1:4 - Bottom of range is 610Hz. Resolution there is 0.03Hz, 0.6Hz at 2.4kHz.
> 1:16 - Bottom of range is 152Hz. Resolution is 0.009Hz, 0.15Hz at 600Hz
> 1:64 - Bottom of range is 38Hz. Resolution is 0.002Hz, 0.04Hz at 150Hz
> 
> Those resolutions give about 1/10 cent accuracy at the low ends of the 
> range and 1/2 cent at 4x higher. Not too bad.
> 
> Not sure what the overall frequency range of the '08 is, but if it goes 
> lower than 38Hz then the dsPIC is may be running slower than 40MHz.
> -----------------
> 
> Eric
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> 



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