Dante/AVB have a latency under 5 ms, transporting many channels, even @96 kHz. It can be done. Just not wireless.
The major problem with wireless lays in the re-authentication that occurs after a preset period. That takes up to several hundred millisecs. Not a problem for a download, or viewing a webpage. Big problem for low-latency streaming. Running without any encryption makes it less, but then you also need a good S/R on the wireless side to stop it from having other problems, like switching channels, or speed. Apple's solution for AirPlay is having a big buffer in their devices. I believe the old Airport Express has 1 to 4 MB allocated for streaming buffer, resulting in seconds of latency. Not a problem for playback. BT is even far worse, and the range is too limited. I've tried most of the possibilities, with Apple devices, Raspberry Pi and ESP8266. It works. It's just not reliable. I've used it for a little while, for recording in forests, where there's no neighbouring wifi to be found. I've reverted back to VHF wireless mics. Less of a hassle. Just my 2 eurocents. Wim Op wo 29 mei 2019 om 17:41 schreef mgraves mstvp.com <[email protected]>: > Agreed. Most of what I think of as the "local signal processing" is quite > speedy. Packetization delay is never less than 20 ms. Transmission delay > dependent upon the network and distance. Poorly designed network elements > lead to buffer bloat, which increases latency dramatically. > > The very latest DECT chipsets are able to deliver a 12.5 kHz audio path > from a microphone. Not sure how that's done. DECT is quite opaque. It > remains the most common approach to a real-time wireless link built > specifically for streaming audio. > > Michael Graves > [email protected] > http://www.mgraves.org > o(713) 861-4005 > c(713) 201-1262 > sip:[email protected] > skype mjgraves > > -----Original Message----- > From: Sursound <[email protected]> On Behalf Of Chris Woolf > Sent: Wednesday, May 29, 2019 10:29 AM > To: [email protected] > Subject: Re: [Sursound] wifi audio (was Re: Deconstructing soundbar > marketing B.S.) > > > On 28/05/2019 19:47, Marc Lavallée wrote: > > Le 28/05/2019 à 13:48, mgraves mstvp.com a écrit : > > > > .... > > The latency is not only caused by the packetization; the transmission > > chain looks like: > > > > (microphone -> ADC -> encoding -> BT transmission) -> (BT reception -> > > decoding) -> (SIP + encoding -> IP transmission) -> (IP reception -> > > SIP + decoding) -> (DAC -> loudspeaker) > > > True enough, but the ADC, encoding, decoding and DAC elements can be > reduced to <3ms (as happens with some of the best recent digital radio > mics), which does indeed indicate that the intermediate stages are the ones > that really do the harm. > > A while back I had to make a short range speech reinforcer for a friend > with a damaged larynx. It had to use an analogue pathway because no > (affordable at the time) digital path had anything like low enough latency > to permit normal, unstilted conversation. A target figure ~has~ to be <10ms > to avoid disturbing speech, and for most people/environments must be <<5ms. > I find it laughable that "low latency" frequently seems to mean 30-50ms. > > Chris Woolf > > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > _______________________________________________ > Sursound mailing list > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20190529/54bacb40/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
