[sdiy] Keyboard scanning rate

[Carsten Tönsmann]

I made a parallel approach by scanning a key block of 8 keys at a time, see

http://www.analog-monster.de/un_kbd_en.html

It is 10 voice polyphonic and scans also key velocity. One can do this with 
Fatar compatible keyboards which have built in the 16 x 8 diode matrix 
interface. I don't know the real scan rate of my circuit, but Iit hadn't be 
too fast because of scanning 8 keys in parallel.

- Carsten


----- Original Message ----- 
From: "Neil Johnson" <neil.johnson97 at ntlworld.com>
To: "synth-diy List" <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, November 25, 2009 10:42 PM
Subject: Re: [sdiy] Keyboard scanning rate


> Hi,
>
> Ullrich Peter wrote:
>> In the Korg Poly800 I measured around 950Hz.
>
> Ok, so a little over 1ms plus a little slop per scan.
>
> At 1ms scan time I can't play fast/hard enough to reach the maximum 
> velocity value so I may go with that for now, with the option of  going up 
> to double that rate.
>
> I know there are a few people on the list who have designed and built 
> their own scanned digital keyboards, so I'm hoping for some differing 
> opinions.
>
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
>
>
>
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