Hi Dick, to some extent this will depend upon the type of sound-card you
have. I use Alberto's Spectran but Wolf's Spectrum lab will do it. The card
problem we found is that some cards will not operate in duplex
(simulataneous input and output) I have some Creative Labs PCI64 that suffer
from this problem. The PCI128 is OK. I would imagine the later cards are
probably ok. You might find the improvement is not a great as you might
hope......but I am not a "real" CW op !!
Cheers de Alan G3NYK
----- Original Message -----
From: Dick Rollema <[email protected]>
To: LF-Group <[email protected]>
Sent: 07 November 2006 14:25
Subject: LF: DSP-filter for aural CW
> To All from PA0SE
>
> Does someone know whether a DSP filter using the sound card of the
computer
> can be found on the internet , that can filter the audio output of the
> receiver with an adjustable bandwidth down to, say, 20Hz or so?
>
> I use a passive audiofilter between the receiver and the headphones with
> four tuned circuits. It has a bandwidth of about 25Hz, a centre frequency
> of 900Hz and a linear phase characteristic to avoid ringing. But perhaps
a
> DSP filter could do even better.
>
> 73, Dick, PA0SE
> JO22GD
>
>
>
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