[sdiy] Casio VL-TONE

[Adam Inglis]

And that was presumably the cheapest (and most compact?) way that  
Casio could make a snare sound in 1980. Was it done with a proprietary  
Casio chip?


BTW I'm waiting with breath abated to see what "designer" digital drum  
delight Richie is cooking up in his lab using these ingredients...

Adam

On 05/09/2014, at 6:09 AM, Richie Burnett wrote:

> Thanks to all those who emailed offering help with this.  I've now  
> got some pristine quality 192kHz 16-bit samples of the drum sounds  
> in question. These revealed precisely the information I was looking  
> for.
>
> For anyone interested, I can now clearly see that the snare sound is  
> made up of a Pseudo Random Bit Sequence from a 15-bit Linear  
> Feedback Shift Register clocked at about 82150 Hz and using the  
> polynomial x^15 + x^14 + 1   An amplitude envelope that decays in 15  
> discrete steps is then applied to this noise.
>
> It's amazing what you can see from a decent hi-res audio recording!
>
> Many thanks,
>
> -Richie,
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