In the landline and cellular business, it's called "sidetone delay" and
anything over 5 ms is cause for concern. See, e.g.,
http://ftp.tiaonline.org/TR-41/TR41.3.3/Public/2007-05-StPetersburg/TR41.3.3-07-05-005-M-ETSI-NarrowbandHandsetHeadset-00063v023.doc
Some sources suggest as much as 25 ms is acceptable, but my experience
is that 10 ms is the outer bound before user complaints occur. The GSM
phones I'm most familiar with have sidetone delay well below 5 ms.
These numbers are based on telephony user studies, and perhaps a
different delay may be considered acceptable in amateur radio circles.
Jack
www.cliftonlaboratories.com
Lyle Johnson wrote:
I have the impression that with the NR engaged the overall volume is
much lower than without. Is there a possibility to adjust the audio
volume / gain in the NR settings somewhere?
I have seen this in the K2 DSP for rtty mode.
This is not currently in the firmware, but is in the suggestion box.
Next question: 2 of my friends who tried the K3 this afternoon think
that there is a significant delay in the monitor output. I don't use
monitor in normal operation, I only use it to adjust my mic settings,
but they make use of it a lot, and felt somehow irritated by the delay.
The delay is 20 to 30 ms. It is because we are sampling the actual IF
signal so we have several filter delays. We're looking at a possibly
different approach that could improve this by 50% or so, but if we're
successful it will be some time before it is ready.
73,
Lyle KK7P
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