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by mediatechnology
Fri Nov 21, 2008 3:50 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

OK. Paul - I think gain trim could be introduced at F before the bypass relay. The trim would only affect only the external processor return for both the M and S channels individually and, when bypassed, would not reduce E-E separation. Using this control it's possible to "null out" the un...
by mediatechnology
Fri Nov 21, 2008 2:36 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

Paul - That added bit is here: http://www.picocompressorforum.com/forum/php/viewtopic.php?f=6&t=71 I was thinkin' that might be another board/module just to keep the complexity of the pure matrix down. It's based on Rick Chenn's '94 design but using 1240s and a Graeme-style (Jerrald) polarity fl...
by mediatechnology
Fri Nov 21, 2008 2:01 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

Three relays sounds better than nine.

Edited:

I think we'll have to explain why there are two bypass options but having half hardware does eliminate a lot of cascaded stages when the M-S gizmo is not being used.
by mediatechnology
Fri Nov 21, 2008 1:53 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

OK, that gets us down to one DPDT relay.

This thing almost has to come up to a patchbay anyway so you can get to the M-S process inserts.

I'd still put extra tie points to bridge C and F (4 points total).
by mediatechnology
Fri Nov 21, 2008 1:19 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

Actually there's no logic involved - just the switches as shown with solo audio flowing through them. I didn't mean to use logic in the "digital" sense. If the pads for them were put in there, they simply become auxillary tie points on the board. The only one where I might suggest a relay ...
by mediatechnology
Fri Nov 21, 2008 12:37 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

What about just putting in pads for a mute switch on the both the M and S channel?
Thanks Paul. That does seem to make more sense. It would only allow post-processing monitoring though. Wouldn't you want to hear mid (or side) both pre and post? Or, would you do that switching in the processor?
by mediatechnology
Fri Nov 21, 2008 11:26 am
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

Here's the solo switching logic:

Image

https://www.ka-electronics.com/Images/j ... iagram.jpg

There can be destructive solo, non destructive or both...

The "to 1646" lines lead to the final outputs.
by mediatechnology
Fri Nov 21, 2008 10:43 am
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

I don't think so since the whole thing will probably be patched in when needed and removed when not. I may be wrong about that though and defer to Paul and Doug. FWIW the solo output could probably be mono. Three switches would be required for that: Mid/Side, Pre/Post and solo On/Off. If destructive...
by mediatechnology
Fri Nov 21, 2008 8:55 am
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

Thanks Doug. Speaking of quick morning scans here's this: https://www.ka-electronics.com/Images/jpg/M-S_Flow_Diagram.jpg https://www.ka-electronics.com/Images/jpg/M-S_Flow_Diagram.jpg This is the basic flow diagram of the combined encoder/decoder. Notice the interstage points labeled A-H. Bypass dis...
by mediatechnology
Fri Nov 21, 2008 5:43 am
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 620119

Re: Mid Side M-S Matrix Uses No Precision Resistors

Thank Paul - I'll draw us a quick picture in a little bit so we're all reading from the same page. Fortunately the scheme I'm proposing is the simplest too.