[Elecraft] K3 NR

[Erik N Basilier]

I find the K3 NR to be rather good, but what strikes me the most is how I can't find a favorite setting, but I always have to go through the available settings to find something that suits a given signal. That would suggest that even more settings could be useful, if they bring anything new to the table. I have to say that I have been rather impressed listening to sample files from BHI LTD:

http://www.radio.bhinstrumentation.co.uk/html/sound_file_demonstration.html

If I am not mistaken, I think some time ago I saw some of their promotional materials boasting that they used an algorithm based on neural networks. It would be interesting to know if such an approach can be shown to be equivalent to the approach used by Elecraft, or if it offers a useful variation.

Another thought: Many noise reducers including the K3's do seem to attenuate the high frequencies, sometimes just slightly and sometimes excessively. Much of what we perceive as irritating noise seems to be in the higher frequencies, and just cutting those off using bandpass or equalizer might have a similar effect. To make it easier to determine whether a particular NR setting is useful, it might be helpful if each of the settings would include filtering that would emphasize the highs to compensate for the highs lost in NR. I am guessing that the effect of the NR would then appear more subtle, but also more honest. Of course the design parameters might not easily translate to the effect of audio frequency response, and that response may vary with the momentaneous characteristics of the wanted signal and the noise, but at least it should be possible to measure the signal and noise characteristics in real time.

73,
Erik K7TV
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