Sorry but I couldn't find the answers to these questions: 1. It appears BT can support up to 7 slaves and a master on one piconet. Can BT simultaneously transmit synchronous (voice) data to each? At what rate? 2. How many "piconets" can exist simultaneously in one area? Just one? More than one? 3. Are there any other configurations whereby more slaves can transmit synchronous (audio) data to a master or set of masters? If so, at what data rate? -- Randy Yates % "Ticket to the moon, flight leaves here today Digital Signal Labs % from Satellite 2" mailto://yates@ieee.org % 'Ticket To The Moon' http://www.digitalsignallabs.com % *Time*, Electric Light Orchestra
Bluetooth Questions
Started by ●September 18, 2009
Reply by ●September 18, 20092009-09-18
Randy Yates <yates@ieee.org> writes:> Sorry but I couldn't find the answers to these questions: > > 1. It appears BT can support up to 7 slaves and a master on one > piconet. Can BT simultaneously transmit synchronous (voice) data > toor from> each? At what rate? > > 2. How many "piconets" can exist simultaneously in one area? Just > one? More than one? > > 3. Are there any other configurations whereby more slaves can transmit > synchronous (audio) data to a master or set of masters? If so, at > what data rate?-- Randy Yates % "My Shangri-la has gone away, fading like Digital Signal Labs % the Beatles on 'Hey Jude'" mailto://yates@ieee.org % http://www.digitalsignallabs.com % 'Shangri-La', *A New World Record*, ELO
Reply by ●September 20, 20092009-09-20
Randy Yates wrote:> Sorry but I couldn't find the answers to these questions: > > 1. It appears BT can support up to 7 slaves and a master on one > piconet. Can BT simultaneously transmit synchronous (voice) data > to each?No. One connection at a time.> 2. How many "piconets" can exist simultaneously in one area? Just > one? More than one?More then one. Limited by the number of RF channels, must be configured properly (which could be non-trivial).> 3. Are there any other configurations whereby more slaves can transmit > synchronous (audio) data to a master or set of masters? If so, at > what data rate?What are you trying to do? Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●September 20, 20092009-09-20
Vladimir Vassilevsky <nospam@nowhere.com> writes:> Randy Yates wrote: > >> Sorry but I couldn't find the answers to these questions: >> >> 1. It appears BT can support up to 7 slaves and a master on one >> piconet. Can BT simultaneously transmit synchronous (voice) data >> to each? > > No. One connection at a time. > >> 2. How many "piconets" can exist simultaneously in one area? Just >> one? More than one? > > More then one. Limited by the number of RF channels, must be > configured properly (which could be non-trivial). > >> 3. Are there any other configurations whereby more slaves can transmit >> synchronous (audio) data to a master or set of masters? If so, at >> what data rate? > > What are you trying to do?Thanks Vlad. I'm trying to see if BT is a viable mechanism for a wireless "snake" system - for use in production or venue audio where you would have a lot of high-quality audio channels going from the stage to a mixer. Sounds like the answer is "probably not." Even at the enhanced (raw) data rate of 3 Mb/s, with rate 1/3 coding, one RF channel is barely enough for one high-quality audio channel. -- Randy Yates % "Remember the good old 1980's, when Digital Signal Labs % things were so uncomplicated?" mailto://yates@ieee.org % 'Ticket To The Moon' http://www.digitalsignallabs.com % *Time*, Electric Light Orchestra
Reply by ●September 20, 20092009-09-20
On 9/20/2009 4:09 AM, Randy Yates wrote:> Vladimir Vassilevsky<nospam@nowhere.com> writes: > >> Randy Yates wrote: >> >>> Sorry but I couldn't find the answers to these questions: >>> >>> 1. It appears BT can support up to 7 slaves and a master on one >>> piconet. Can BT simultaneously transmit synchronous (voice) data >>> to each? >> No. One connection at a time. >> >>> 2. How many "piconets" can exist simultaneously in one area? Just >>> one? More than one? >> More then one. Limited by the number of RF channels, must be >> configured properly (which could be non-trivial). >> >>> 3. Are there any other configurations whereby more slaves can transmit >>> synchronous (audio) data to a master or set of masters? If so, at >>> what data rate? >> What are you trying to do? > > Thanks Vlad. I'm trying to see if BT is a viable mechanism for > a wireless "snake" system - for use in production or venue > audio where you would have a lot of high-quality audio channels > going from the stage to a mixer. > > Sounds like the answer is "probably not." Even at the enhanced > (raw) data rate of 3 Mb/s, with rate 1/3 coding, one RF channel is > barely enough for one high-quality audio channel.BT is, by design, very short range. It's intended for "Personal Area Network" applications, i.e., just stuff very close to an individual. I think it'd be tough to make it work for what you're describing. By "snake" do you mean a mesh system or just something to replace the cable snake? It also operates at 2.4GHz, so interference is likely, especially if you have a lot of devices in the channel. You might look into Zigbee modules, which I think might be a better fit. -- Eric Jacobsen Minister of Algorithms Abineau Communications http://www.abineau.com
Reply by ●September 20, 20092009-09-20
Randy Yates wrote:> Thanks Vlad. I'm trying to see if BT is a viable mechanism for > a wireless "snake" system - for use in production or venue > audio where you would have a lot of high-quality audio channels > going from the stage to a mixer.Ah, snake network over wireless is the known tough problem. There are some WiFi based solutions, however they are pretty heavyweight.> Sounds like the answer is "probably not." Even at the enhanced > (raw) data rate of 3 Mb/s, with rate 1/3 coding, one RF channel is > barely enough for one high-quality audio channel.Perhaps the easiest way is the old style analog FM, but it is going to be limited to 20...30 channels or so. Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●September 20, 20092009-09-20
Vladimir Vassilevsky <nospam@nowhere.com> writes:> [...] > Ah, snake network over wireless is the known tough problem. There are > some WiFi based solutions, however they are pretty heavyweight.I thought the WiFi latency is unacceptable in this application. We're talking less than 20 ms. -- Randy Yates % "Remember the good old 1980's, when Digital Signal Labs % things were so uncomplicated?" mailto://yates@ieee.org % 'Ticket To The Moon' http://www.digitalsignallabs.com % *Time*, Electric Light Orchestra
Reply by ●September 20, 20092009-09-20
Randy Yates <yates@ieee.org> wrote:>Vladimir Vassilevsky <nospam@nowhere.com> writes:>> Ah, snake network over wireless is the known tough problem. There are >> some WiFi based solutions, however they are pretty heavyweight.>I thought the WiFi latency is unacceptable in this application. >We're talking less than 20 ms.You could use WirelessHD. Steve
Reply by ●September 20, 20092009-09-20
spope33@speedymail.org (Steve Pope) writes:> Randy Yates <yates@ieee.org> wrote: > >>Vladimir Vassilevsky <nospam@nowhere.com> writes: > >>> Ah, snake network over wireless is the known tough problem. There are >>> some WiFi based solutions, however they are pretty heavyweight. > >>I thought the WiFi latency is unacceptable in this application. >>We're talking less than 20 ms. > > You could use WirelessHD.I'd read about some of this 60 GHz stuff in Electronic Products. Amazing technology. But I'm afraid the range requirements don't line up - the FAQ states "in room 10 meters". -- Randy Yates % "Though you ride on the wheels of tomorrow, Digital Signal Labs % you still wander the fields of your mailto://yates@ieee.org % sorrow." http://www.digitalsignallabs.com % '21st Century Man', *Time*, ELO
Reply by ●September 20, 20092009-09-20
Vladimir Vassilevsky <nospam@nowhere.com> writes:> [...] > Ah, snake network over wireless is the known tough problem.PS: I didn't know there were any tough problems for you, Vladimir. This must be damn-near impossible! :) -- Randy Yates % "And all that I can do Digital Signal Labs % is say I'm sorry, mailto://yates@ieee.org % that's the way it goes..." http://www.digitalsignallabs.com % Getting To The Point', *Balance of Power*, ELO
