[Elecraft] Clean 600hz signal, full dsp decoupling possible?

[PA3CW]

Hi Geoff,

Thanks for your reaction. I am very curious whether the modern DSP
technology can discriminate signal from noice (in CW) better than the human
ear and I dont know if it would be boring to just hear a clean tone whilst
the signal is at a minimum level. I think it will be an amazing thing to
experience as you do expect having to put in a lot of effort to hear the
signal through a lot of noise. The second step is if the DSP of the K3 is
able to include such a setting or external 'tracking filter' is necessary.

Best,
Dick ... . . .._



Geoffrey Mackenzie-Kennedy wrote:
> 
> Hello Dick,
> 
> I am not a DSP expert either, but a tracking filter keying an audio 
> oscillator will do exactly what you want. In its simplest form a tracking 
> filter is a phase locked loop, and ICs which can be used at audio for this 
> purpose have been available since the 1960s and are inexpensive. Also a 
> tracking filter working at audio can be connected to a receiver's low
> level 
> audio output if one is not already in the receiver. I believe that the DSP 
> wizards have already designed something that does the same job.
> 
> Tracking filters are very useful when searching for signals below the 
> receiver's noise floor, at VHF for example, but listening to a keyed audio 
> oscillator without noise can be quite boring.
> 
> 73,
> Geoff
> GM4ESD
> 
> 
> 
> ----- Original Message ----- 
> From: "PA3CW" <pa3cw at planet.nl>
> To: <elecraft at mailman.qth.net>
> Sent: Saturday, October 17, 2009 8:57 PM
> Subject: [Elecraft] Clean 600hz signal, full dsp decoupling possible?
> 
> 
>>
>> Hello forum friends,
>> Not being an expert in the world of DSP, but being an experienced CW
>> operator i often asked myself this question:  Why is there no full
>> decoupling between the received signal and the tone in the headset or
>> speaker? In other words is it possible that the dsp discrimiates enough
>> between signal and noise and steers a clean LF oscillator making a clean
>> 600hz or so tone?  Is such a setting possible or do i overlook something
>> here? Just a little out of the box thinking...
>> Dick PA3CW
> 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> 
> 

-- 
View this message in context: http://n2.nabble.com/Clean-600hz-signal-full-dsp-decoupling-possible-tp3841926p3843529.html
Sent from the Elecraft mailing list archive at Nabble.com.