Odp: [sdiy] Scanner Vibrato emulation, first results

[Roman Sowa]

I did something like that years ago, but it used ADSP2181.
One input of stereo ADC was used for audio, second was
pot, or actually - CV input. It was really simple. Samples were
placed in circular buffer, and CV was directly written to
read index register of this buffer. I noticed that CV had to be
well filtered, otherwise lots of cracking at fast transients would
appear. AFAIR it was 1u cap on 100k pot wiper giving CV,
and FIR processing those samples. Or maybe it was crapy
pot that caused that...
Anyway, in the end it sounded like tape recorder with
controlled speed.

Roman

----- Original Message -----
From: Magnus Danielson <cfmd at swipnet.se>
To: <harrybissell at prodigy.net>
Cc: <epeasant at telusplanet.net>; <jhaible at debitel.net>;
<synth-diy at dropmix.xs4all.nl>
Sent: Friday, May 23, 2003 3:07 PM
Subject: Re: [sdiy] Scanner Vibrato emulation, first results


> From: harrybissell <harrybissell at prodigy.net>
> Subject: Re: [sdiy] Scanner Vibrato emulation, first results
> Date: Thu, 22 May 2003 23:59:01 -0400
>
> > Yes... I hear the voice of the BBD....
> >
> > Its saying
> >
> > "TURN TO THE DARK SIDE...TuRN tO tHe dARk SiDe...tuRn to the darK
> > sIde...
> > tu_n t_ t_e da_k s_de... tpffft hisss e darpfft hisssss.... pshttttttt
> > pshtt.... sssssssssssss"
>
> Hehehe... good to see things are still in order... ;O)
>
> Now, did anyone attempt to build the variable delay using A/D, memory and D/As
> that I proposed some time back? It should be prototyped since it seemed like a
> fairly simple thing considering the acheivements. If you recall it had a CV
> input for the delay-amount and used the buffer-fill-level together with the CV
> to control the D/A side PLL.
>
> Cheers,
> Magnus