The K3 NR algorithm is a trade-off between noise reduction and stability. The wider the dynamic range of signals presented to it, the more aggressive it must be, which in turn makes it less useful for applying small amounts of noise reduction.
The NR pays some attention to the settings of AGC Slope and AGC Threshold. The higher the Threshold, and the steeper the Slope, the more aggressive NR must be at its lowest settings to prevent instability (SCREECH!!!!). We have chosen to make the NR somewhat more aggressive in all cases to prevent instability. Thus, if you have AGC Threshold set low and the Slope set to flat, the NR will be more usable on weaker signals. In the end, NR is a filter, and like any filter it will affect what is being passed through it. The weaker the signal, the more it appears like noise and the harder it is to separate the two. Finally, NR is part of a general field of psychoacoustics. What some people like, others barely tolerate. Somewhat like tastes in music... We are always looking at ways of doing this better, and went through a very lengthy several months ago to improve NR. You can be sure that we will revisit it when we review the status of the K3 firmware and operation. 73, Lyle KK7P (your friendly K3 DSP guy) ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
