Re: [HCDX]: sound processing results ?

[ARouw@xxxxxxxxxxx (Aart Rouw)]

Guido,
I tried things similar to what you mentioned, a.o. on a recording of R.
Reading Service (3935 kHz) with an ID that was on the borderline of
readability. However,  my experiences are the same : On marginal recordings
(close to the noise bottom)  I did not get a big jump in readability,
although it helped maybe a little bit.
What seemed to bring the largest change, was to remove "noise" or "hiss"
according to a pre-set of user defined filter setting. Although background
noise disappeared, part of the signal was removed as well. It then sounded
rather "metallic" (if you understand what I mean), easier to listen to, but
still no big increase in readability.
Another story is the removal of heterodynes. If this is the source of poor
readability, one can remove it nearly completely by these tools, without
hurting the rest of the signal.
Any other experiences ?

Regards,
Aart Rouw

-----Ursprüngliche Nachricht-----
Von: Guido Schotmans <gs@xxxxxx>
An: HCDX <hard-core-dx@xxxxxxxxxxxxx>
Datum: Sonntag, 30. Januar 2000 19:35
Betreff: [HCDX]: sound processing results ?


>I have been trying some DSP and sound processing tools on a recording from
>Radio Vanuatu I made in early December.  It was a very noisy recording from
>which I could understand nothing.  I've ID'ed them only from the 'yellow
>bird call'.  I thought that it would be possible to do some sound
processing
>on it to make it more or less understandable. But the only result was that
I
>could make it sound in many different ways, but not in such a way that it
>became better understandable.  Has anybody ever managed to clear up a
>DX-catch by sound processing ?
>
>I tried the following stuff.
>
>
>
>Software:  Chroma Sound
>http://www.siliconpixels.com
>
>
>Swezey DSP
>http://www.winternet.com/~swezeyt/dsp.htm
>
>and
>
>CoolEdit
>http://www.syntrillium.com/cep/prodemo.htm.
>
>
>* * * * * * * * * * * * * * * * * * * * * * * * * * * *
>Guido Schotmans - Editor-in-Chief - DX-Antwerp, BELGIUM
>e-mail : gs@xxxxxx
>Narrow FM Homepage http://gallery.uunet.be/gs/
>* * * * * * * * * * * * * * * * * * * * * * * * * * * *
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