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Transmitting wireless audio


dtr
July 9, 2013 | 3:39 am

Hi,

For one of my performance projects I’m looking for a way to wirelessly transmit the signals from the photo-diodes I’m wearing on my body to the mixing desk. The photo-diodes are mounted on tiny pre-amp circuits that output a (weak) line signal. Right now I have 2 signals but would like to be able to expand.

I ‘m looking for something smaller than a mic body-pack so it can be hidden in for example a wrist-band. One option I’m contemplating is hacking this kind of transmitter, remove the plug and attach the pre-amp output directly: http://www.samsontech.com/samson/products/wireless-systems/airline-77/airline77gtr/ (supposedly a guitar pick-up level transmitter should work with the weak line output of our pre-amps). Drawback is that each signal needs its own sender-receiver pair.

Perhaps you guys have other tips? Would be nice if the signal can stay in the analog domain but digital solutions can be considered.

For the curious, here’s a video of the first (wired) try-out we did: https://vimeo.com/67496061

Tanx D.


July 9, 2013 | 5:25 am

Hello Dieter,

maybe I can offer some help here.

Some things that pop into my mind:

- do you really need to send it as an audio signal? I would guess that you can combine all the data for all the sensors on one body in an Arduino Mini and use one wireless device for transmitting a serial stream (you can look at 433 MHz or to Xbee shields). This setup could turn out quite small, but needs an external battery.

- there are some nice and small wireless audio solutions on the market. Check out another thread in this forum where I posted some links: http://cycling74.com/forums/topic/wireless-audio/

- talking about guiter transmitter/receivers: check the line6 g30 and g50 and the bodypack transmitter TBP 06 – http://nl.line6.com/relay/
We use them in my band and they operate flawlessly…

Good luck with your project,
Vincent



dtr
July 9, 2013 | 5:29 am

Hey, thanks for the input. We do need the audio signal. The signal plugs straight into the PA system. Direct, raw light-to-sound principle.

- do you really need to send it as an audio signal? I would guess that you can combine all the data for all the sensors on one body in an Arduino Mini and use one wireless device for transmitting a serial stream (you can look at 433 MHz or to Xbee shields). This setup could turn out quite small, but needs an external battery.

Can this operate at audio rate?


July 9, 2013 | 5:42 am

If it plugs directly in to the PA, a full-on audio solution is probably the way to go, since you stay in that domain of connections ;-) The Line6 equipment is eg. maybe more suitable for this. Be sure to check the TBP 06.

The Arduino route offer more expandibility (hooking up more sensors is easily done) but is a digital connection. Xbee offer more than 1Mbps so far enough for two sensors, but you need to convert at transmitter (Sensor -> Arduino -> Xbee) and at receiver (Xbee to Max? to Audio…) to go to PA which is anyway more hassle and as I understand doesn’t suit your needs.


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