Does the K3S DSP support LMS noise reduction ?

[Jerry Moore]

I don't see LMS listed. Does it support that?

Thanks in advance.

jer

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[Lyle Johnson]

Yes, identical to the K3.

73,

Lyle KK7P

> I don't see LMS listed. Does it support that?

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[wayne burdick]

Absolutely. I'm sure Lyle, KK7P (our DSP engineering) can weigh in with more details.

73,
Wayne
N6KR


On Aug 4, 2015, at 7:23 AM, "Jerry Moore" <[hidden email]> wrote:

> I don't see LMS listed. Does it support that?
>
> Thanks in advance.
>
> jer
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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[Sverre Holm (LA3ZA)]

The K3 and thus presumably the K3S implements one particular form of the Least Mean Squares algorithm called the Leaky LMS, see Lyle's response some years ago: http://elecraft.365791.n2.nabble.com/K3-NR-td1557606.html#a1557836

That's an adaptive version of a Wiener filter that doesn't get so easily 'stuck' in a non-optimal solution if signal statistics should change drastically. Instead the non-optimal solution 'leaks' out of the filter.

The Wiener filter by itself is a fixed signal-to-noise optimizing filter, and thus is fundamentally different from low pass,  high pass etc in that the filter's coefficients depend on the input signal.