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From: "John Rabson" <word.factory@zetnet.co.uk>
To: rsgb_lf_group@blacksheep.org
Subject: LF: Fw: Slow-Audio (was Re: DX Cluster spots for 10/17Dec at GB7DXM)
Date: Tue, 19 Dec 2000 08:38:22 -0000
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We only got down to half bandwidth, but...

----- Original Message -----
From: John Rabson <word.factory@zetnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, December 18, 2000 10:01 PM
Subject: Slow-Audio (was Re: DX Cluster spots for 10/17Dec at GB7DXM)


> You might find this paper interesting:
>
> Rabson, John and Hugo (1996) 'Some Experiments in Speech Bandwidth
Reduction
> ', CREG Journal 24, pp3,6.
>
> If you have difficulty getting hold of the article please let me know.
>
> ----- Original Message -----
> From: Holger 'Geri' Kinzel, DK8KW <DK8KW@compuserve.com>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Monday, December 18, 2000 7:55 AM
> Subject: LF: DX Cluster spots for 10/17Dec at GB7DXM
>
>
> > Another thought: we in Germany are allowed to use any mode with a
maximum
> > bandwidth of 800Hz. I know that normal 2.1 kHz wide SSB signals havne
been
> > transmitted in the early days of LF in the UK. Has anyone ever thought
of
> > "Slow-Audio" instead of Slow-CW? My idea is to use an audio editing
> program
> > such as Cool Edit (available as shareware) and reduce the running speed,
> so
> > that a normal sharply filtered (the filter is a build-in feature of Cool
> > Edit)  2.4 kHz audio signal is compressed into 800 Hz or an even smaller
> > bandwidth. The same software could then be used to expand the signal
again
> > and make it audible. I plan to do some local testing (and yes: I will
run
> > those on reduced power using time slots when normally there is no
traffic,
> > I do not want to block the entire band with such a funny signal ...) to
> see
> > what can be achieved ...
>
> 73 de
> John Rabson G3PAI
>
>