Lyle explains the K3's DSP NR

[Barry N1EU]

The K3 Wiki has been updated with an excellent explanation of how Noise Reduction works in the K3's DSP.  Thanks Lyle!

Please view at http://www.zerobeat.net/mediawiki/index.php/K3_DSP

73,
Barry N1EU

[N4LQ-2]

Interesting. However the K3 is the first receiver I've seen that does
anything at all with the narrow cw filter in line. I can tell some
improvement even with 100hz bandwidth although not as much as 2.8khz as
described. The NR in most JA rigs including my IC-7800 does nothing at all
with a narrow filter so I was happy to see the K3 work as well as it does.
What I would like to know is the meaning of the various levels of NR as you
crank the main knob. T1, T2, T3 etc. Is one better for cw than the other? I
find myself using the T1-1 or T1-2 most of the time.
Steve Ellington
[hidden email]
----- Original Message -----
From: "Barry N1EU" <[hidden email]>
To: <[hidden email]>
Sent: Thursday, April 17, 2008 8:26 PM
Subject: [Elecraft] Lyle explains the K3's DSP NR

>
> The K3 Wiki has been updated with an excellent explanation of how Noise
> Reduction works in the K3's DSP.  Thanks Lyle!
>
> Please view at http://www.zerobeat.net/mediawiki/index.php/K3_DSP
>
> 73,
> Barry N1EU
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> View this message in context:
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[KK7P]

> What I would like to know is the meaning of the various levels of NR as
> you crank the main knob. T1, T2, T3 etc. Is one better for cw than the
> other? I find myself using the T1-1 or T1-2 most of the time.

The best way to learn this is to use it and experiment.  There is no
correct, objective answer because of the psycho-acoustic perception
variation in the population.  What sounds OK or even good to one person
may be exceedingly irritating or nerve-wracking to another.

---

The "T" value indicates the length of the FIR filter being constructed,
  Lower values are longer filters and may be thought of as less aggressive.

The second value indicates a mix of processed and unprocessed signals.
Lower numbers have more unprocessed signal mixed in, so they will be
less affected by the processing but have a lower limit on achievable
noise reduction.

And since the K3 is an SDR, this is all subject to change as the
firmware evolves, or due to customer feedback, or ?

73,

Lyle KK7P

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[KK7P]

>> What I would like to know is the meaning of the various levels of NR
>> as you crank the main knob...
>
> ---
>
> The "T" value indicates the length of the FIR filter being constructed,
>  Lower values are longer filters and may be thought of as less aggressive.


This should have stated "F" values.

"T" values are for the noise blanker and are entirely different!

73,

Lyle KK7P

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