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From: Greg Hanson on 2 Jun 2010 21:53
On Wed, 02 Jun 2010 23:24:52 +0300, Paul Keinanen <keinanen(a)sci.fi>
wrote:


>What kind of hearing model are you assuming ?
>
>Just simple amplitude weighting ?
>

Nothing exotic. I just want a uniform rotational effect from speaker-
to-speaker that is independent of frequency.

Analogous to a bounce between L and R channels (there are plenty of
circuits and music products for this), but circular.

Greg Hanson
From: Kevin McMurtrie on 3 Jun 2010 02:01
In article <4c0641ee.2781390(a)news.tpg.com.au>,
greghanson(a)prograde.com (Greg Hanson) wrote:

> Has anyone seen a circuit, or commercial product, that enables one to
> pan (rotate) a mono audio signal 360 degrees around 4 speakers
> arranged in a circle?
>
> Ideally, speed of rotation needs to be manually adjustable across the
> full range of 1-40Hz.
>
> There are plenty of 2 channel panners out there, but they do not suit
> this application.
>
> Greg Hanson

Three panners/electric attenuators?

mono -> left, right
left -> front left, rear left
right -> front right, rear right

You'll need a sine wave generator with a 90 degree shifted output to
produce a circle. There should be some schematics on the web. If
that's too hard, two unsynchronized sine waves will produce Lissajous
patterns. They spin too but not in a circle.

Panning is a subtle effect. The old analog way to do this is a speaker
mounted under rotating horns. This produces the phase changes, doppler
shift, and reverb needed for a strong spinning effect. Professional
music software can simulate it.
--
I won't see Google Groups replies because I must filter them as spam
From: Ian Bell on 3 Jun 2010 04:53
On 02/06/10 12:40, Greg Hanson wrote:
> Has anyone seen a circuit, or commercial product, that enables one to
> pan (rotate) a mono audio signal 360 degrees around 4 speakers
> arranged in a circle?
>
> Ideally, speed of rotation needs to be manually adjustable across the
> full range of 1-40Hz.
>
> There are plenty of 2 channel panners out there, but they do not suit
> this application.
>
> Greg Hanson


Quad pan pots as they were called were common on pro audio mixers in the
70s. The used a joystick with pots attached to achieve it.

Cheers

Ian
From: Charlie E. on 3 Jun 2010 12:11
On Thu, 03 Jun 2010 01:53:19 GMT, greghanson(a)prograde.com (Greg
Hanson) wrote:

>On Wed, 02 Jun 2010 23:24:52 +0300, Paul Keinanen <keinanen(a)sci.fi>
>wrote:
>
>
>>What kind of hearing model are you assuming ?
>>
>>Just simple amplitude weighting ?
>>
>
>Nothing exotic. I just want a uniform rotational effect from speaker-
>to-speaker that is independent of frequency.
>
>Analogous to a bounce between L and R channels (there are plenty of
>circuits and music products for this), but circular.
>
>Greg Hanson

For that, all you need are four ganged pots, with a 90 degree dead
zone, set 90 degrees apart...

Charlie
From: whit3rd on 4 Jun 2010 16:37
On Jun 3, 9:11 am, Charlie E. <edmond...(a)ieee.org> wrote:

> For that, all you need are four ganged pots, with  a 90 degree dead
> zone, set 90 degrees apart...

But, it has to move at up to 40 Hz rotation rate? That bunch of
pots will wear out fast. Either a capacitive or inductive
solution would work better, longer. And there's the small matter
of driving the shaft according to some (yet unspecified) rule of
position-versus-time.
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