ChatGPT tells me that almost all of the latency is due to the frame size
of the FFT processor. At the application's default sample rate of 2024
that works out to be just barely under the 43 msec I measured. That
sample rate is needed to do the actual processing with decent results,
so the best workaround seems to be a two path approach ... use a much
lower frame size when the sidetone is detected and the default frame
size when it isn't. Theoretically the latency could be dropped to maybe
less than 5 msec.
And as you say, if everything was implemented inside the radio, the
keying itself could control that with almost zero latency.
73,
Dave AB7E
On 7/29/2026 10:30 AM, Walter Underwood via Elecraft wrote:
The algorithm probably has inherent latency regardless of where it is
implemented. This is one of the challenges of digital processing.
But…if implemented internal to a radio, the sidetone could bypass the
processing.
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
On Jul 29, 2026, at 10:03 AM, Gwen Patton via Elecraft
<[email protected]> wrote:
Can it just turn off when sending CW? When you go back to listening, turn
it back on? It doesn't need to be on while you're manually sending CW, you
can't hear the noise anyway because you're transmitting.
-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P
On Wed, Jul 29, 2026 at 2:19 AM David Gilbert via Elecraft <
[email protected]> wrote:
A ham that has been experimenting with my NoiseNuller application
pointed out to me where the current latency is indeed a problem, and
that is when listening to the sidetone while sending CW with a key or
paddle. The sidetone audio coming out of the computer is delayed enough
to throw off your keying at anything other than pretty slow speeds if
you depend upon that for feedback. It wouldn't be a problem for keying
from a keyboard, but it is when manually keying.
I'm working to improve that.
In my opinion, though, it's just another reason why this kind of
processing really belongs inside the rig itself.
73,
Dave AB7E
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