[Elecraft] [K3} [KX3] SSBT like CWT ?

[Gary Gregory]

Would this provide the same result when the user has either a hearing
defect or reduced hearing?

Would the above issues be irrelevant.

It does sound like an interesting project though.

73
Gary

On 5 February 2013 16:54, Wright, Robert <rwright at ap.com> wrote:

> This sounds like an interesting project.  It would seem that the technique
> would be finding the offset frequency that provides the best alignment of
> harmonics, which is what we naturally do by ear.  Not difficult, but would
> probably need a bit of tweaking to provide good real-time performance.   It
> would only be valuable if it was significantly faster than what we do
> manually.
>
> It's good when projects are self-motivating.
>
> 73, Bob, N7ZO
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:
> elecraft-bounces at mailman.qth.net] On Behalf Of Peter Lambert
> Sent: Monday, February 04, 2013 9:25 PM
> To: 'Erik Basilier'; Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] [K3} [KX3] SSBT like CWT ?
>
> You are spot on, Eric
>
> This is an algorithm I've contemplated writing many times.
>
> Voice results from the vocal cords snapping together in the range around
> 85Hz.  The filter effect of the various cavities, throat, mouth and nasal
> are quite high Q and filter the harmonic rich vocal chord excitation to
> produce the voice.
>
> If you watch an SSB signal on your PSK waterfall you'll clearly see the
> harmonics of the vocal chords.
>
> I think a DSP algorithm that calculates the location of the carrier based
> on the separation between the vocal chords is a definite doable proposition.
>
> It would give SSB the perfect clarity you seek.
>
> Love to have a go at this (I do DSP).  Do you Elecraft guys want to have a
> go or interested in using it if I do it ? (I could probably do it as a
> piece of PC code that processes sound card input so you could evaluate it).
> Doesn't feel like to be a difficult thing to do.
>
> Cheers,
> Peter VK4JD
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Erik Basilier
> Sent: Tuesday, 5 February 2013 3:07 PM
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] [K3} [KX3] SSBT like CWT ?
>
> At Field Day I have observed a number of operators operating SSB. I have
> noticed that there is a great variation in skill when it comes to tuning
> the RX to an SSB signal. Sometimes I feel that the op has it tuned all
> wrong and I almost want to grab the knob. Maybe different people's brains
> focus on different aspects of the sound when they tune the RX. Some people
> seem to want to tune for the best balance between highs and lows, when the
> HI CUT and LO CUT would do a better job. When I tune the RX, I believe that
> I am not trying to balance highs and lows, but rather trying to find some
> kind of harmony in the sound. If I were tuning in a piece of music from an
> AM BC station with the radio in SSB mode, clearly the harmonics of a
> musical note will not be harmonious if the radio tuning is off. If a voice
> is used for singing, it is like a musical instrument. If the voice is
> speaking, I believe the harmonics are still at play as with a musical note.
> This leads me to speculate that it
>   would be possible to run an FFT on the received audio and determine by
> how much the RX tuning is off, just like with CWT. I am very fond of the
> CWT feature on the K3 and on the KX3. I wonder if it would be practical to
> add SSBT as a new feature.
>
>
>
> 73,
>
> Erik K7TV
>
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-- 
*Gary - VK1ZZ
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