[sdiy] wavetable lookup waves

[harry]

John L Marshall wrote:

<snip>

> Blue sky.
>
> Now, since all of these bits are available, but there is significant
> redundancy is there some clever method of building wavetables of greater
> resolution in the same size ROM?
>
> Could waves be mirrored; count up then down?

easily.

> Could waves be mirrored; count, change sign then count again?

easily.

> Could waves be segmented into parts A, B, C, and D?

Yes (but note I didn't say easily - assuming an all hardware system. In software
it
would not be hard)

> Could wave segments be stored on ROM B and then be pointed at by ROM A?
> (Sorta, kinda like a state machine.) (Granular sound?)

Yes (again, not simple... but could be done...)

The neatest waveform generator I saw made a sine wave using the technique
of generating only one quadrant... then using mirror and invert. I looked and
said
"thats easy any @sshole could have done that"  So I tried and proved that I was
NOT an @sshole (yeah i know... still open for debate...) because my solution
could not get within 300% of the original in chip count.

My theorem: All other engineers are either @ssholes... or so ungodly clever that
I
can't even perceive HOW clever they are...

H^) harry

>
>
> ----- Original Message -----
> From: matti <matti at devo.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, December 28, 2001 3:40 AM
> Subject: RE: [sdiy] wavetable lookup waves
>
> > On Fri, 28 Dec 2001, Colin Fraser wrote:
> >
> > >
> > > Eh ?
> > >
> > > 8 bits * 256 bytes = 2048 bits.
> > > Possible combinations = 2 ^ 2048 = 3.2 x 10 ^ 616
> > >
> > > Colin f
> >
> > oh. less scary. thanks.
> >
> >
> > -
> > the chatter has stopped. oh joy. achmed, yon achmed, make my felt.
> >
> >

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