Search found 3204 matches

by JR.
Mon Dec 08, 2008 10:30 am
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

OK, here's the part where I admit I was wrong.. The LTP gives me close to the actual transfer function I want for gain in current output, but the VCAs accept a linear control voltage for log gain change so the real control voltage needed is one linear slope above 0dB (pan center) and a non-linear sl...
by JR.
Sun Dec 07, 2008 6:43 pm
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

I'm still thinking about the problem this is supposed to solve, namely ITB summing. So letting this interface with and be controlled by some recording program software almost let's it drop in place of the flawed digital path, and that interface could also provide some cheap fader and pan automation....
by JR.
Sun Dec 07, 2008 1:17 pm
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

Cool... now I guess I need to deliver... My general concept is KISS... no EQ no auxes, no inserts, just input XLRs, input level fader and pan, a bus master fader, then output XLRs. Per input EQs or dynamics, can be patched in series with line inputs, overall EQ or dynamics in series with output. The...
by JR.
Sat Dec 06, 2008 4:26 pm
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

I am willing to lend my engineering support to a proper current source summer. My last 24 bus efforts at Peavey demonstrated merit with some 120 feeds to L/R bus. I think the use of 2x VCA for channel L and R feeds to master offers a ton of promise in absolute performance. I would preface this all w...
by JR.
Sat Dec 06, 2008 11:37 am
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: ITB vs OTB

OK, I wasted a couple hours researching this and I have come up with a few themes. #1 There does appear to be some breakdown in summing performance when many digital stems are combined in a lower cost digital environment. This was evidenced by comparisons between a large real time mix, and later com...
by JR.
Wed Dec 03, 2008 4:02 pm
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

Thanks, I'd be very interested in finding some real there-there.. With all the smoke and arm waving I don't doubt there are problems with lesser digital hardware/software. If there's a real need for such a product, and not just a perceived need, I would gladly rise to the occasion. While the correct...
by JR.
Wed Dec 03, 2008 12:42 pm
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

I am reluctant to undertake a significant analog design project when in theory digital signals can be combined with no degradation, in fact after combining digital signals you get too much good information and some must be discarded. The analog console company I worked with on the meter project have...
by JR.
Wed Dec 03, 2008 12:07 pm
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

Another compensation question for you John: Some time ago I saw a schematic for a distibution amp and in it they had used a 5534 as a polarity inverter with a signal gain of -1. It was an internal stage without external loading (cable). IIRC the Rin and Rfb were 10K. What was different about it was...
by JR.
Sat Nov 29, 2008 10:28 am
Forum: Pro Audio Design
Topic: OTB Mixer Using Current Summation
Replies: 137
Views: 172987

Re: Pease - What's All This Adjustable Slew Rate Stuff Anyhow?

A capacitor across the feedback R can be compensated nicely by a similar C to the positive input (assuming Rs at both inputs), a C from the - input to ground is not the same animal. In fact a C to ground can generally be compensated for with a C across the feedback R. These Cs form a parallel feedba...
by JR.
Thu Nov 27, 2008 6:14 pm
Forum: The Peabody Lounge
Topic: Best cities for dining?
Replies: 20
Views: 26137

Re: Best cities for dining?

mediatechnology wrote:The best cities for dining?

Consider Tempe, Arizona....

http://www.heartattackgrill.com/

Profiled on this morning's CBS Sunday Morning with Bill Geist having the "quadruple bypass."
I like the side "dishes" but those burgers are just wrong.. :twisted:

JR