[Elecraft] DSP and the KX3

[Walter Underwood]

It might be possible to decompose speech into a constellation of formants and filter out frequency and time components that didn't match human speech patterns, a bit like a Viterbi decoder for speech. You'd have to be careful not to overfit the training vocabulary and to allow for different speakers, languages, etc. I expect the processing would add a lot of delay. 

Get started in digital voice on HF with the information and software at http://freedv.org/ The current favorite mode is 1.25 KHz wide.

wunder
K6WRU

On Feb 5, 2014, at 3:18 PM, Phil Hystad <phystad at mac.com> wrote:

> Wayne,
> 
> Thanks for the quick reply.  My friend and I were discussing ways of doing this (that is, sending/receiving clear voice with DSP helps) and then I decided that it has been done.  Well, not by the K3 because it does not digitize the actual signal being sent but I was thinking of D-Star and its use with repeaters.  I wonder how wide that digital signal is, maybe you know.  D-Star on HF might be too wide.
> 
> 73, phil, K7PEH
> 
> 
> On Feb 5, 2014, at 2:59 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
> 
>> Hi Phil,
>> 
>> The KX3 (and K3) both provide several ways to make speech signals more intelligible in the face of noise or reflections, including NR (stochastic noise reduction), NB (impulse blanking), and passband shift/width adjustment. I'm not sure that compensation for multipath distortion is possible or even desirable, but it's an interesting question.
>> 
>> 73,
>> Wayne
>> N6KR
>> 
>> 
>> On Feb 5, 2014, at 2:48 PM, Phil Hystad <phystad at mac.com> wrote:
>> 
>>> For you KX3 signal processing experts and the algorithms implemented for the KX3?
>>> 
>>> Is there any work to clean up an actual SSB signal to make it more intelligible in cases of various phase changes or interference via reflections (ionosphere).  I mean, a slightly warbled signal cleaned up to reduce or eliminate that kind of distortion?
>>> 
>>> I am not even sure if or how this can be done as my experience in signal processing is certainly not up to that level but it seems that it may be possible.
>>> 
>>> No, this is not because I am having a problem with my KX3, it is a question asked by a friend of mine so I am relaying it here.
>>> 
>>> 73, phil, K7PEH
>>> 
>>> 
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> 
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--
Walter Underwood
wunder at wunderwood.org