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Author Topic: Getting audio from a mixer into a phone  (Read 1161 times)

Mike Caldwell

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Re: Getting audio from a mixer into a phone
« Reply #10 on: July 31, 2017, 09:03:18 pm »

What type of patch cable are you using between the mixer and the adapter cable, is it a two conductor shielded with a TRS plug or a single conductor shielded with a TS plug. What ever you used the first time try the other.

Maybe the built in amplifier is the issue.

 

Mark Schneider

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Re: Getting audio from a mixer into a phone
« Reply #11 on: July 31, 2017, 09:04:45 pm »

You had all this advice and you went and purchased the cheapest piece of wire with two connectors on it that you could, then wonder why it doesn't work.

I purchased the adapter after the 1st 5 responses, before the replys listing other possible gear.  Besides, why not start cheap and see if it works before investing in something more.

What I don't understand is why a mic level input (or so I would think the Galaxy would be) produces a signal too quiet when fed a line level signal.  That doesn't make sense to me.  What am I missing about that?
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Mark Schneider

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Re: Getting audio from a mixer into a phone
« Reply #12 on: July 31, 2017, 09:06:34 pm »

What type of patch cable are you using between the mixer and the adapter cable, is it a two conductor shielded with a TRS plug or a single conductor shielded with a TS plug.

I actually tried both, with the same results for either.
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Scott Holtzman

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Re: Getting audio from a mixer into a phone
« Reply #13 on: July 31, 2017, 10:34:06 pm »

I purchased the adapter after the 1st 5 responses, before the replys listing other possible gear.  Besides, why not start cheap and see if it works before investing in something more.

What I don't understand is why a mic level input (or so I would think the Galaxy would be) produces a signal too quiet when fed a line level signal.  That doesn't make sense to me.  What am I missing about that?

First, buy once, cry once.  Who knows what the impedance is of the input of the phone.  That just screams for a matching network between the two inputs.

It's not just about the voltage, though this adapter could simply be placing audio on the wrong pin.  Some gross impedance mismatch could be the root of the problem.

What I am sure of is the active devices suggested have a much better chance of working.

Android and IoS devices both support external interfaces in their current versions.  This would be the path I would take if I just had to record audio on a phone.  A laptop with a USB to balanced input is a much better choice.

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Scott AKA "Skyking" Holtzman
River Delta Audio is now:

Ghost Audio Visual Solutions, LLC
Cleveland OH
www.ghostav.rocks

Bill Koonce

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Re: Getting audio from a mixer into a phone
« Reply #14 on: August 01, 2017, 12:11:29 am »

First, buy once, cry once.  Who knows what the impedance is of the input of the phone.  That just screams for a matching network between the two inputs.

It's not just about the voltage, though this adapter could simply be placing audio on the wrong pin.  Some gross impedance mismatch could be the root of the problem.

What I am sure of is the active devices suggested have a much better chance of working.

Android and IoS devices both support external interfaces in their current versions.  This would be the path I would take if I just had to record audio on a phone.  A laptop with a USB to balanced input is a much better choice.
(emphasis mine) And rather than use either a laptop or a phone as the camera, why not get a real video camera with XLR audio inputs? That's pretty much what I use on one of my gigs. Not only does that give the pro audio connectors and levels, it eliminates any time delay between audio and video.

I looked into the whole S5 "microphone" input and found that it was really a multipurpose (think GPIO) pinout. It has a phantom voltage of 2.3V, and that has to be dropped to 1V by just the right DC resistance (not impedance), or else the input doesn't process any audio. By default it's a make-or-break switch that can be used as another button to push. So the little IC inside the phone that the 3.5mm jack plugs into is somewhat clever. To do it right, a circuit that provides the correct voltage drop, removes the phantom voltage from the audio gear, and provides whatever audio level that the phone requires is what is needed. A job for a fairly complex circuit IMO.
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Scott Holtzman

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Re: Getting audio from a mixer into a phone
« Reply #15 on: August 01, 2017, 12:28:36 am »

(emphasis mine) And rather than use either a laptop or a phone as the camera, why not get a real video camera with XLR audio inputs? That's pretty much what I use on one of my gigs. Not only does that give the pro audio connectors and levels, it eliminates any time delay between audio and video.

I looked into the whole S5 "microphone" input and found that it was really a multipurpose (think GPIO) pinout. It has a phantom voltage of 2.3V, and that has to be dropped to 1V by just the right DC resistance (not impedance), or else the input doesn't process any audio. By default it's a make-or-break switch that can be used as another button to push. So the little IC inside the phone that the 3.5mm jack plugs into is somewhat clever. To do it right, a circuit that provides the correct voltage drop, removes the phantom voltage from the audio gear, and provides whatever audio level that the phone requires is what is needed. A job for a fairly complex circuit IMO.

So in addition to a proper impedance match you need a pull down resistor just to get the port in audio mode.

Interesting info Bill.

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Scott AKA "Skyking" Holtzman
River Delta Audio is now:

Ghost Audio Visual Solutions, LLC
Cleveland OH
www.ghostav.rocks

Bill Koonce

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Re: Getting audio from a mixer into a phone
« Reply #16 on: August 01, 2017, 01:18:08 am »

So in addition to a proper impedance match you need a pull down resistor just to get the port in audio mode.

Interesting info Bill.
Thanks Scott, it didn't register right away, but the talk about using TRRS reminded me of something:

http://www.jensign.com/S4Jack/

A while ago I came across an ad for an "extra button" for Android phones that used the headphone jack, and an app to program the button that was at the end of a TRRS plug. Had no need for the thing myself, but...

Another reminder that, as electronics become more sophisticated, that only paying attention to the mechanics of getting the right adapter cable simply isn't enough. Can't just assume that some random piece of consumer electronics will wire right into a pro audio system in turnkey fashion.
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