200e

Hi all,
I was just wondering if the 210e allows phase reversal of the audio
signal or if phase reversal is possible via other means, specifically
for the purposes of feedback/feedforward experimentation.
Thanks!
Matt

I might be wrong, but I have always assumed that on the 227e, positions 
A, B, C, and D are 90 degrees out of phase from one another.  So C is 
180 degrees out of phase from A and D is 180 degrees out of phase from 
B. 

Matt



--- In 200e@yahoogroups.com, "Matt Carpenter" <matfhew.carpenfer@...> 
wrote:

>
> Hi all,
> I was just wondering if the 210e allows phase reversal of the audio
> signal or if phase reversal is possible via other means, specifically
> for the purposes of feedback/feedforward experimentation.
> Thanks!
> Matt
>

Doesn't make much sense to me (But I don't own any modules). The 227e
is a quad channel device. In general no one defaults audio as far as I
know to 90 degree phase shifts  to do quad. All you will wind up with
is more potential of cancellation  in an acoustic space.  And 90
degrees for that matter probably requires a pair of allpass filters to
achieve. It's not something you can get without filters as far as I
know compared to just inverting the polatity for 180 degrees (though
filters could do that too).

 My guess is people are thinking along these lines because if you are
mixing  quad audio you  might very well want to hit your VCAs with  90
degree quadrature of a *control voltage* in order to do "circular" pan
effects. Or perhaps someone just wants to identify the speakers in
numbers rather than ABCD if they represent a quad space


--- In 200e@yahoogroups.com, "mritenburg" <mritenburg@...> wrote:

>
> I might be wrong, but I have always assumed that on the 227e, positions 
> A, B, C, and D are 90 degrees out of phase from one another.  So C is 
> 180 degrees out of phase from A and D is 180 degrees out of phase from 
> B. 
> 
> Matt
> 
> 
> 
> --- In 200e@yahoogroups.com, "Matt Carpenter" <matfhew.carpenfer@> 
> wrote:
> >
> > Hi all,
> > I was just wondering if the 210e allows phase reversal of the audio
> > signal or if phase reversal is possible via other means, specifically
> > for the purposes of feedback/feedforward experimentation.
> > Thanks!
> > Matt
> >
>

I found this in the archives:
http://launch.groups.yahoo.com/group/200e/message/104

"You can also phase shift the filtered signal using spacial dynamics in
the 227e. B and C are 90 degrees out of phase from A and D is 180
degrees out of phase from A. Mix the filtered signal back to the
original signal - voila, a phaser. Try it with 1 signal sent to all
channels of the filter with each channel set to a different center
frequency."


I seem to remember another post concerning the same issue... maybe in regards to the 
259e sine output???....  but I can't find it at the moment.  I don't have a 227e so I cannot 
comment or test it out.

-tom


--- In 200e@yahoogroups.com, "nicholas_kent" <zaum@...> wrote:

>
> Doesn't make much sense to me (But I don't own any modules). The 227e
> is a quad channel device. In general no one defaults audio as far as I
> know to 90 degree phase shifts  to do quad. All you will wind up with
> is more potential of cancellation  in an acoustic space.  And 90
> degrees for that matter probably requires a pair of allpass filters to
> achieve. It's not something you can get without filters as far as I
> know compared to just inverting the polatity for 180 degrees (though
> filters could do that too).
> 
>  My guess is people are thinking along these lines because if you are
> mixing  quad audio you  might very well want to hit your VCAs with  90
> degree quadrature of a *control voltage* in order to do "circular" pan
> effects. Or perhaps someone just wants to identify the speakers in
> numbers rather than ABCD if they represent a quad space
> 
> 
> --- In 200e@yahoogroups.com, "mritenburg" <mritenburg@> wrote:
> >
> > I might be wrong, but I have always assumed that on the 227e, positions 
> > A, B, C, and D are 90 degrees out of phase from one another.  So C is 
> > 180 degrees out of phase from A and D is 180 degrees out of phase from 
> > B. 
> > 
> > Matt
> > 
> > 
> > 
> > --- In 200e@yahoogroups.com, "Matt Carpenter" <matfhew.carpenfer@> 
> > wrote:
> > >
> > > Hi all,
> > > I was just wondering if the 210e allows phase reversal of the audio
> > > signal or if phase reversal is possible via other means, specifically
> > > for the purposes of feedback/feedforward experimentation.
> > > Thanks!
> > > Matt
> > >
> >
>

there is some confusion of terms. the paragraph below should read,
"the AMPLITUDES of B and C..." etc.

i don't think the conclusion is right. panning stuff around the quad outputs
doesn't produce delay, which is the essential component of phasers, etc.

fortunately there are sweet sweet phasers and filters in the system already.

-eb


On Mon, Apr 28, 2008 at 12:54 PM, tmeade1974 <tmeade1974@yahoo.com> wrote:

>   I found this in the archives:
> http://launch.groups.yahoo.com/group/200e/message/104
>
> "You can also phase shift the filtered signal using spacial dynamics in
> the 227e. B and C are 90 degrees out of phase from A and D is 180
> degrees out of phase from A. Mix the filtered signal back to the
> original signal - voila, a phaser. Try it with 1 signal sent to all
> channels of the filter with each channel set to a different center
> frequency."
>
> I seem to remember another post concerning the same issue... maybe in
> regards to the
> 259e sine output???.... but I can't find it at the moment. I don't have a
> 227e so I cannot
> comment or test it out.
>
> -tom
>
>
> --- In 200e@yahoogroups.com <200e%40yahoogroups.com>, "nicholas_kent"
> <zaum@...> wrote:
> >
> > Doesn't make much sense to me (But I don't own any modules). The 227e
> > is a quad channel device. In general no one defaults audio as far as I
> > know to 90 degree phase shifts to do quad. All you will wind up with
> > is more potential of cancellation in an acoustic space. And 90
> > degrees for that matter probably requires a pair of allpass filters to
> > achieve. It's not something you can get without filters as far as I
> > know compared to just inverting the polatity for 180 degrees (though
> > filters could do that too).
> >
> > My guess is people are thinking along these lines because if you are
> > mixing quad audio you might very well want to hit your VCAs with 90
> > degree quadrature of a *control voltage* in order to do "circular" pan
> > effects. Or perhaps someone just wants to identify the speakers in
> > numbers rather than ABCD if they represent a quad space
> >
> >
> > --- In 200e@yahoogroups.com <200e%40yahoogroups.com>, "mritenburg"
> <mritenburg@> wrote:
> > >
> > > I might be wrong, but I have always assumed that on the 227e,
> positions
> > > A, B, C, and D are 90 degrees out of phase from one another. So C is
> > > 180 degrees out of phase from A and D is 180 degrees out of phase from
>
> > > B.
> > >
> > > Matt
> > >
> > >
> > >
> > > --- In 200e@yahoogroups.com <200e%40yahoogroups.com>, "Matt Carpenter"
> <matfhew.carpenfer@>
> > > wrote:
> > > >
> > > > Hi all,
> > > > I was just wondering if the 210e allows phase reversal of the audio
> > > > signal or if phase reversal is possible via other means,
> specifically
> > > > for the purposes of feedback/feedforward experimentation.
> > > > Thanks!
> > > > Matt
> > > >
> > >
> >
>
>  
>


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