[Elecraft] More on NoiseNuller Latency

[David Gilbert]

Yes, and that is exactly one of the approaches I plan to explore. Doing 
it fast enough probably requires a version written in C++, though.  
ChatGPT tells me that the browser use an audio handler with a relatively 
slow response.  In addition, and I quote ChatGPT here, "not all browsers 
can be trusted to handle the audio processing the way you tell it to."

The C++ version would look for a particular tone that matched the user's 
choice for the sidetone, but it would need to be careful not to trigger 
when receiving a signal of that same tone.

Another approach might be to use a simple Arduino-type box that connects 
to the computer via USB.  You plug the key into that box and it keys 
both the rig and the computer application at the same time.

73,
Dave   AB7E



On 7/29/2026 10:03 AM, Gwen Patton 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 
> <elecraft at mailman.qth.net> 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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