[Elecraft] K3's RF Clipping Speech Processing

[Julius Fazekas]

The higher clipping parameter seems to make the higher pitched voice less understandable. There does seem to be some "mushiness" to the lower pitched voice, but for my ears it seems less prominent.

The crispness of the 25 setting is how I would like to sound. I've had good reports with mine set at 30, but I can hear enough of a difference that I'm willing to go with clarity.

It doesn't seem to give up much in the way of "punch"...

Nice that you have a good test setup and willing to share your findings with those of us without :o)

73,
Julius 

Julius Fazekas
N2WN

Tennessee Contest Group
http://www.k4ro.net/tcg/index.html

Tennessee QSO Party
http://www.tnqp.org/

Elecraft K2/100 #4455
Elecraft K3/100 #366


--- On Mon, 3/16/09, Jack Smith <jack.smith at cliftonlaboratories.com> wrote:

> From: Jack Smith <jack.smith at cliftonlaboratories.com>
> Subject: Re: [Elecraft] K3's RF Clipping Speech Processing
> To: "Julius Fazekas n2wn" <phriendly1 at yahoo.com>
> Cc: elecraft at mailman.qth.net
> Date: Monday, March 16, 2009, 11:42 AM
> I was surprised at the intelligibility of speech
> with essentially zero amplitude variation - clipping level
> = 40. The
> envelope looks almost like FM, but the speech is still
> understandable,
> although not comfortable to listen to for extended periods.
> I had read 
> this in one of the books written by the staff engineers at
> Collins
> Radio but didn't fully appreciate their comment at the
> time.
> 
> 
> 
> Jack
> 
> 
> 
> 
> 
> Julius Fazekas n2wn wrote:
> 
>   Thanks Jack!
> 
> Based on your presentation and the voice settings, I'll
> be dropping my
> compression back a notch. Figure if it's easier for me
> to understand it will
> be easier for others to understand me (mumble mumble).
> 
> 73,
> Julius
> n2wn
> 
> 
> Jack Smith-6 wrote:
>   
>   
>     I've added a page with some measurements of the
> K3's RF speech clipping 
> functionality, including sample sound records, oscilloscope
> envelope 
> views and spectrum analyzer captures.
> 
> http://www.cliftonlaboratories.com/elecraft_k3_speech_processing.htm
> 
> Jack K8ZOA
> www.cliftonlaboratories.com
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>     
>   
>   
> 
> -----
> Julius Fazekas
> N2WN
> 
> Tennessee Contest Group
> http://www.k4ro.net/tcg/index.html
> 
> Tennessee QSO Party
> http://www.tnqp.org/
> 
> Elecraft K2/100 #4455
> Elecraft K3/100 #366