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

[PA3CW]

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
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