[sdiy] "AVR synthesizer"

[Paul Maddox]

Rainer,

> >This is probably the simplest low pass digital filter ever invented; the
> >formula is:
> >y[i] = y[i-1] + m*( x[i] - y[i-1] )
>
> With y[i]=x[i]-x[i-1]+m*y[i-1] you would have the simplest digital
> high-pass filter, just in case there's still some space left in program
> memory.

give that we will be using the MEGA16, this has three advantages
1) hardware multiply
2) faster (double the speed)
3) double the code space.

so I can see that we may have to include some kind of 'boot loader' so that
as things develop people can update their chips (I forgot, the MEGA16 also
allows self programming, hence MIDI-Sysex update should be possible, so in
fact 4 advantages over the older 8535).

Paul