[PD] wireless audio from Pd to PA system (katja)

[katja]

Thanks everyone for your answers.

The case is unconventional because a stereo line signal must be sent from
the computer. Professional wireless systems assume mic or instrument.
Consumer systems do transmit stereo signal, but without bothering too much
about latency.

Frankly, I did not expect the difficulty to find a good solution. Initially
I wanted the wearable computer for a music video which is to be recorded
live with sounds from natural objects. I bought the FM transmitter so my
cameraman will be able to hear the music while he's filming. For this
purpose it is ideal. Then I thought it would be good to use the computer in
it's wearable mode for public performance. I figured that one of the many
wireless solutions would suit the purpose, but didn't reckon with the
unusual requirements.

Further searching brought me to a new technology 'PurePath' from Texas
Instruments. It has a range comparable with WiFi (30m), while it seems to
work with paired devices as in Bluetooth. I haven't seen consumer products
with this technology, but development kits are available. A rather
convincing demo is here:

http://www.youtube.com/watch?v=0YsnZQUfVGs

If this system can work with low latency it could be perfect for wireless
Pd.

Katja



On Fri, Mar 1, 2013 at 11:41 AM, Antoine Villeret <
antoine.villeret at gmail.com> wrote:

> hello,
>
> those are good for what they have been designed for and it depends on what
> you mean by "exellent sound quality"
>
> I've made few tests on those few years ago and the bandwidth could be good
> enough to transmit guitar/bass signal but nothing else for me
>
> +
> a
>
>
> --
> do it yourself
> http://antoine.villeret.free.fr
>
>
> 2013/2/28 richard duckworth <richduckworth at yahoo.com>
>
>> Hi Katja
>> one of these would do it - check with Thomann tech support for gain
>> issues (these are Instrument Level input) They should be fine however as
>> active guitar pickups (like heavy style EMG pickups) output quite high
>> levels. These type of wireless systems tend to be very rugged, have
>> excellent sound quality and long battery life - and you'll want these
>> things.
>>
>> http://www.thomann.de/ie/cat.html?gf=wireless_for_guitar_bass&oa=pra
>>
>>
>>
>> Rich Duckworth
>> Lecturer in Music Technology
>> Department of Music
>> House 5
>> Trinity College
>> Dublin 2
>> Ireland
>> Tel 353 1 896 1500
>>
>> "Digital?
>> Is that the thing where they take a good old sine wave and they chop it
>> up into little bits?" --- Rupert Neve
>>   ------------------------------
>>
>>
>>
>> Message: 3
>> Date: Thu, 28 Feb 2013 11:53:43 +0100
>> From: katja <katjavetter at gmail.com>
>> Subject: [PD] wireless audio from Pd to PA system
>> To: pd-list <pd-list at iem.at>
>> Message-ID:
>>     <CAFY0eapPSKfw+gVaxuTr7exHqLiG+pTdu8Rk6SNTraLiys2Msg at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> For a wearable live performance computer, I am looking into the
>> options of sending wireless audio from Pd to a PA sound system and
>> other listeners.
>>
>> In a first experiment I've tried a Linex FM transmitter. Audio quality
>> is good enough, and FM transmitters do not introduce latency. This
>> option is cheap and flexible, as the signal can be received by simple
>> radio's, which are even built into cell phones and media players. I
>> would need to boost the transmission a bit to make it more reliable.
>> This will of course make the equipment illegal. Even then, the risk
>> that someone else is transmitting a stronger signal on the channel can
>> not be excluded.
>>
>> Another option could be to send audio over Wifi. This would require
>> WLAN to be available, and one extra computer (with audio interface) as
>> a receiver. To avoid extra latency the audio should be sent
>> uncompressed, like [udpsend~] / [udpreceive~] can do it. This has the
>> risk of packet loss and serious dropouts.
>>
>> I've been searching for 2.4 GHz wireless music receivers and found
>> things like this:
>> http://www.sitecom.com/en/wireless-music-streamer/wl-061/p/203. They
>> seem to act like external soundcards for your computer. In Linux
>> though I've never managed to properly connect multiple soundcards with
>> Pd (in OSX it's easy using the Aggregate Device Editor from Audio MIDI
>> Setup). Also I guess these devices introduce huge latency. With audio
>> over bluetooth headsets I've experienced latencies up to a second.
>>
>> Does anyone use a satisfactory method in practice, to send audio from
>> Pd without wires?
>>
>> Thanks,
>> Katja
>>
>>
>>
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