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Automatic Audio Switch
Anyone make, or have suggestions for, an automatic audio switch...
Input with a signal gets connected to the Output ?? ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine Sometimes I even put it in the food |
Automatic Audio Switch
Jim Thompson wrote:
Anyone make, or have suggestions for, an automatic audio switch... Input with a signal gets connected to the Output ?? I've built something like that into a PA mixer for use in churches & conference rooms about 10 years ago. If you look into that sort of equipment, you'll probably find what you need. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... "If it doesn't fit, use a bigger hammer!" -------------------------------------------------------------- |
Automatic Audio Switch
Jim Thompson wrote: Anyone make, or have suggestions for, an automatic audio switch... Input with a signal gets connected to the Output ?? It's called a Gate. Inluded in the piece of Behringer kit I suggested in the compander thread. Graham |
Automatic Audio Switch
We do something along those lines in avionics, but it turned out to be less
than useful. We called it priority encoding. That is, you have a number of inputs (say 4 for example). You put the most important signal on channel 1 and you use a simple diode detector to see if there is any audio on this channel. IF so, THEN shut off the other 3 channels with gates and the usual audio analog switch like a 4016. Then IF no audio on 1, then the second priority line uses the same detector and IF audio on this channel, THEN shut off 3 and 4. And so on down the line. 4 needs no detector. If there is nothing on 1, 2, or 3, then 4 is a pass-through. The problem we found in actual service is that you'd be listening to something rather important on line 2 when line 1 came on calling another aircraft and shut off #2. Not a good thing. I think I've got the prototype around in the "that was a hell of a good idea" box somewhere. Jim -- "It is the mark of an educated mind to be able to entertain a thought without accepting it." --Aristotle "Jim Thompson" wrote in message ... Anyone make, or have suggestions for, an automatic audio switch... Input with a signal gets connected to the Output ?? ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine Sometimes I even put it in the food |
Automatic Audio Switch
In article , "RST Engineering \(jw\)" wrote:
We do something along those lines in avionics, but it turned out to be less than useful. We called it priority encoding. That is, you have a number of inputs (say 4 for example). You put the most important signal on channel 1 and you use a simple diode detector to see if there is any audio on this channel. IF so, THEN shut off the other 3 channels with gates and the usual audio analog switch like a 4016. Then IF no audio on 1, then the second priority line uses the same detector and IF audio on this channel, THEN shut off 3 and 4. And so on down the line. 4 needs no detector. If there is nothing on 1, 2, or 3, then 4 is a pass-through. The problem we found in actual service is that you'd be listening to something rather important on line 2 when line 1 came on calling another aircraft and shut off #2. Not a good thing. I think I've got the prototype around in the "that was a hell of a good idea" box somewhere. Jim I would use a stereo headset. Feed both channels normally. Then put #1 to one side only then put other channel on other side, with ability to manually control. greg |
Automatic Audio Switch
On Tue, 31 Mar 2009 08:14:35 -0700, "RST Engineering \(jw\)"
wrote: We do something along those lines in avionics, but it turned out to be less than useful. We called it priority encoding. That is, you have a number of inputs (say 4 for example). You put the most important signal on channel 1 and you use a simple diode detector to see if there is any audio on this channel. IF so, THEN shut off the other 3 channels with gates and the usual audio analog switch like a 4016. Then IF no audio on 1, then the second priority line uses the same detector and IF audio on this channel, THEN shut off 3 and 4. And so on down the line. 4 needs no detector. If there is nothing on 1, 2, or 3, then 4 is a pass-through. The problem we found in actual service is that you'd be listening to something rather important on line 2 when line 1 came on calling another aircraft and shut off #2. Not a good thing. I think I've got the prototype around in the "that was a hell of a good idea" box somewhere. Jim Sno-o-o-o-ort! One of those aw-**** moments ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine Sometimes I even put it in the food |
Automatic Audio Switch
On Mon, 30 Mar 2009 11:20:03 -0700, Jim Thompson
wrote: Anyone make, or have suggestions for, an automatic audio switch... Input with a signal gets connected to the Output ?? ...Jim Thompson Made something like that in ancient times around a HEF4060 and 2 HEF 4053's. It would scan inputs, if audio present, it would stop the 4060 clock. Second 4053 to drive one of the 4 leds. (OK, I had a load of 4053's, had to use them up..) ~ Best Regards, Rene ~ |
Automatic Audio Switch
"Jim Thompson" wrote in message ... On Mon, 30 Mar 2009 18:48:50 GMT, (Nico Coesel) wrote: Jim Thompson wrote: Anyone make, or have suggestions for, an automatic audio switch... Input with a signal gets connected to the Output ?? I've built something like that into a PA mixer for use in churches & conference rooms about 10 years ago. If you look into that sort of equipment, you'll probably find what you need. Just solved my own question: Both of these audio sources also have video outputs, both S-video and composite. I'll just use the presence of composite to select the correct audio channel ;-) ...Jim Thompson That's what the automatic S-Video switch I had from Radio Shack did. Worked great to auto select the active channel in priority order. Unfortunately (That word usually follows RS at one point or another), we had a severe brown-out and the microprocessor that ran the thing did not have any sort of under voltage lockout... What followed is that apparently it ate it's own flash and became a different function - a SMT rework teaching station for my production department grin If anybody should be interested in the inner workings, I found the operator manual and schematics for the BiAmp Advantage System One modular sound system that we have in our church. The Advantage AGII contains the AGC and priority gating section. Operator manual: http://www.biamp.com/discontinued_pr...e=pr od&tid=6 Schematics: http://www.biamp.com/discontinued_pr...e=pr od&tid=6 Oppie |
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