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
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