[Elecraft] K3 Noise Reduction..revisited

[Don Wilhelm]

Trevor,

Those Noise Reduction algorithms you refer to seem to be quite clever 
and effective.  They appear to be close to the NR that I have in my 
hearing aids which does a great job of extracting speech from noise. 
Unfortunately, the NR in my hearing aids also thinks sustained musical 
notes are noise, and by the same token, CW can also be considered noise.
Nothing is perfect, and compromises must be made, but the current NR 
algorithm used in the K3 does not work for me either - it causes severe 
distortion of SSB signals (speech) and while my AGC settings do not 
create the wild signal increases on CW that others have reported, I 
usually find that narrow filtering is more pleasant to use than the NR 
function.
Perhaps Lyle is looking at other alternatives for NR in the K3, but I do 
know that he is quite busy with other 'irons in the fire' right now, so 
patience is a virtue for now and we could possibly discover improvements 
down the road.
All these thoughts are entirely my own and are based on pure speculation 
- I have no further information than what has been posted to the 
Elecraft reflector.

73,
Don W3FPR

Trevor Smithers wrote:
> As far as I'm aware there are two companies that produce this technology for the amateur 
> market, BHI in the UK and Michels-Engineering in Germany. The german unit is designed 
> specifically for the extraction of the speech waveform when surrounded by noise. BHI is similar 
> but works with cw as well.
>
> Here are a couple of links to audio samples of both units in operation
> http://www.ing-michels.de/audio_demonstrations.html
> http://www.radio.bhinstrumentation.co.uk/html/demonstration.html
>
> There is a downside to using these units in that they only work with a mono input so you loose the 
> binaural function. To get around this I purchased two of the internal modules (DX21) from 
> Michels-Engineering and wired them to each stereo channel. This allows independent control of 
> the noise reduction in each ear and retains the AFX/binaural function.
>
> 73
> Trevor  G0KTN
>
>     
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