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 mgra...@mstvp.com http://www.mgraves.org o(713) 861-4005 c(713) 201-1262 sip:mgra...@mjg.onsip.com skype mjgraves -----Original Message----- From: Sursound <sursound-boun...@music.vt.edu> On Behalf Of Chris Woolf Sent: Wednesday, May 29, 2019 10:29 AM To: sursound@music.vt.edu 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 Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
