[sdiy] Panning in Quad Resources and Docs

John Marshall wa7bsr at gmail.com
Mon Apr 20 19:38:46 CEST 2020


This is just a side note: Morton Subotnick's album 'Touch' was recorded in
quad. I heard it performed live at WWU. Excellent!

On Mon, Apr 20, 2020 at 9:52 AM Dakota Melin <dksynth at gmail.com> wrote:

> Hi,
>
> nice to hear someone is interested :) quad lives!
>
> A scanner is one way to do it but the person I have in mind for this is
> more interested in gestural motions so dual voltages for X, Y positioning
> is more convenient I think.
>
> I'm happy to chat about the fundamentals of the idea, the circuit itself
> is not really finished yet.
>
> What I'm playing with right now derives "quadrant" voltages from joystick
> X and Y inputs to control 4 VCAs that would be for Front Right, Rear Right,
> Rear Left and Front Left speakers. There is equal power breakpoint panning
> between adjacent channels. The equal power law is adjustable, I'm not sure
> which would be most appropriate yet (-3dB, -4.5dB, -6dB). Single-axis
> panning goes down to full closed in the center and back up when going
> straight across. Controlling it with a joystick, joystick straight forward
> sound would come out of both front speakers at a slightly reduced
> amplitude, rotating joystick to the right it would come out stronger out of
> only the front right speaker, and as you continued to rotate around it
> would crossfade smoothly from speaker to speaker.
>
> here is the simulation fully rotating around:
> https://imgur.com/a/gpEKb8V
>
> and here is the simulation of single axis front-to-back motion:
> https://imgur.com/a/Pt6SyTf
>
> best,
> -dk
>
>
>
>
>
>
>
>
>
>
> On Mon, Apr 20, 2020 at 10:49 AM ulfur hansson <ulfurh at gmail.com> wrote:
>
>> i'd be highly intrigued in learning more about this subject as well. it
>> would basically need an equal power interpolating scanner?
>>
>> if you are willing please share!
>>
>> many thanks,
>> -úlfur
>>
>> mán., 20. apr. 2020 kl. 01:58 skrifaði Dakota Melin <dksynth at gmail.com>:
>>
>>> Hi everyone,
>>>
>>> I've been playing around with some ways to pan signals in quad systems
>>> this weekend and I'm looking for resources on the subject.
>>>
>>> https://i.imgur.com/3UIU7gG.png
>>>
>>> Serge T mentioned a CalArts paper on the subject by Darrell Johansen. I
>>> would be interested if anyone knows where to find a copy of that for me to
>>> read, or anything else that may be relevant.
>>>
>>> best,
>>>
>>> -dk
>>> _______________________________________________
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>>>
>>
>>
>> --
>>>> ulfurhansson.com
>> cargocollective.com/ulfur
>> instagram.com/ulfur_
>> .•°~ Úlfur - Arborescence on Spotify
>> <https://open.spotify.com/album/118CEJliIg47Jcr70y7Kww>
>>
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