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From: John Rabson <john.rabson07@gmail.com>
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Date: Tue, 3 Dec 2013 07:57:47 +0100
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Subject: Re: LF: Article on VLF
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On 2 Dec 2013, at 23:18CET, Graham <g8fzk@g8fzk.fsnet.co.uk> wrote:

>=20
> You could even tailor it to letter frequencies, e.g. one short pulse =
for E, one long pulse for T, ...
>=20
> Ah , some  sort of  drifting  oscillator  ? the  longer the  'on time' =
the  more  in moves=20
> =20
> would  sound   something  like a Bird  'Chirping'         could  call =
it  'Chirp=92  !

How about Time Encoded Speech?  In one version you analyse the input =
waveform segment by segment and compare each segment with a library of =
templates. You then send the ID of the template which is the best match, =
its amplitude and its duration. The speech waveform is reconstructed at =
the far endi.

John F5VLF

>=20
> --------------------------------------------------
> From: "Chris Trayner" <C.Trayner@leeds.ac.uk>
> Sent: Monday, December 02, 2013 10:09 PM
> To: <rsgb_lf_group@blacksheep.org>
> Cc: "Robin Gape" <robingape@ukfsn.org>
> Subject: Re: LF: Article on VLF
>=20
> >=20
> > On 2013 Dec 2, at 18:31, John Rabson wrote:
> >=20
> >> I have received the following request from G4AEE of the Cave Radio =
& Electronics Group Journal editorial team:
> >>=20
> >> =93[We wish] to include an article on what radio amateurs are doing =
at VLF ...
> >> Another aspect would be the likely performance of highly compressed =
speech.
> >=20
> >=20
> > Hey, I've got this great idea.
> > Rather than compress speech, why not render the message simpler? =
Rather than the sounds you could just send the text, encoding the =
letters in some way. You could turn the carrier on and off, say in short =
or long bursts, with a group of such pulses to represent each letter.
> >=20
> > You could even tailor it to letter frequencies, e.g. one short pulse =
for E, one long pulse for T, ...
> >=20
> > 73,
> > Chris
> > -----------------------
> > Dr Chris Trayner
> > School of Electronic & Electrical Engineering,
> > The University of Leeds,
> > Leeds LS2 9JT, United Kingdom
> > Tel: +44 113 34 32053
> > Fax: +44 113 34 32032
> >=20
> >=20
> >=20
> >


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