Don Wilhelm wrote: > > 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.
My experience also. The VA gave me some new digital [DSP] hearing aids a few years ago. They will notch a fire truck siren down to a tolerable level, and do a fine job of extracting voice and music from noise [except for sustained notes]. I hadn't heard birds in nearly 40 years until I got these. However, they apparently think CW is a fire truck. I am finding that my K3 NR performance is very sensitive to other RX settings as well as the DSP BW. The recently posted suggestions for AGC settings have helped a lot. I'm pretty much CW-only because of my hearing, I have the stock roofing filters, and I usually run the DSP around 250 Hz. Engaging NR at one of the lesser aggressive settings raises the volume of the signal, I turn down the AF Gain, and the noise subsides nicely with the signal now standing out in my headphones better. There seems to be a threshold level below which a very weak signal can't be found by the NR algorithm but I haven't had time to experiment with the NR settings yet. Possibly a more agressive setting will lower that threshold. Really agressive settings seem to create more garbage than they reduce noise. Haven't gotten to SSB yet. My K3 is definitely NOT your father's radio :-) 73, Fred K6DGW - Northern California Contest Club - Auburn CA [Placer County, CM98LW] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
