Apparently, Line 6 managed to build a digital 2.4 GHz wireless with <4 ms latency, the Relay G30, G50 etc . They do not write it in the specs, but most users don't notice latency and when they do, their support is speaking of latency as low as that:
http://line6.com/support/thread/33898 This weekend I will do some WiFi experiments and see how fast it can go locally, using mrpeach udp and tcp classes. If it works, one could use a wireless router which has no other task than routing Pd audio, and the computer at the receiving end could be a cheap headless board with no other task than receiving Pd audio and converting it to analog. Together the receiving device could be the size of a weight-watcher's lunch box, while at the transmitter side the computer's built-in stuff is used. Maybe I'm a bit naive here, anyway I'll report results from experiments. Katja On Fri, Mar 1, 2013 at 2:14 PM, richard duckworth <[email protected]>wrote: > OMG - that's really high! Maybe Tranz have a belt holder solution - they > do look kind of bulky though! Maybe worth dropping them a line, see if > they'll help the Pd community > > > 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 > ------------------------------ > *From:* katja <[email protected]> > *To:* Antoine Villeret <[email protected]> > *Cc:* richard duckworth <[email protected]>; "[email protected]" < > [email protected]> > *Sent:* Friday, 1 March 2013, 13:12 > *Subject:* Re: [PD] wireless audio from Pd to PA system (katja) > > Found more info about TI's PurePath wireless. Latency of wireless > transmission is 768 samples minimum. Added to this must be the latencies of > ad/da conversion. > > http://e2e.ti.com/support/low_power_rf/f/382/t/110331.aspx > > Forget about it, this concept is only useful for home entertainment. > > Katja > > > On Fri, Mar 1, 2013 at 1:19 PM, katja <[email protected]> wrote: > > 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 < > [email protected]> 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 <[email protected]> > > 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 <[email protected]> > Subject: [PD] wireless audio from Pd to PA system > To: pd-list <[email protected]> > Message-ID: > <cafy0eappskfw+gvaxutr7exhqlig+ptdu8rk6sntraliys2...@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 > > > > ------------------------------ > > _______________________________________________ > Pd-list mailing list > [email protected] > to manage your subscription (including un-subscription) see > http://lists.puredata.info/listinfo/pd-list > > > End of Pd-list Digest, Vol 95, Issue 152 > **************************************** > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > > > > >
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