Hi Pete and Geri,
Codec2 might be a viable medium term solution for real-time compression
of speech for narrow band communication (http://codec2.org/).
There is also an interesting presentation about Codec2 by David Rowe on
youtube: http://www.youtube.com/watch?v=KsywWf8dQgU
73 Stefan, DJ2SEA
-------- Original Message --------
Subject: Re: LF: Re: 477 NOV What Modes ?
From: M0FMT <[email protected]>
To: [email protected] <[email protected]>
Date: Fri Dec 21 2012 13:37:25 GMT+0100
> Hi again Geri
>
> I remember the SM stns using normal SSB on a beacon QRG 505 +/-. a
> couple of years ago but not compressed.
>
> I was thinking that there must be a method or algorithm that has a look
> up table of "diphones" and is able to utilise the repetitive sounds,
> spaces and diphones of the language in use (hard luck German has over
> 2500 Spanish has 800). Thus a real time narrow band communication
> channel carrying only pointing data would result. The outcome will
> probably be a cross between Donald Duck and Stephen Hawking in a channel
> of a few Hz? Any mileage (sorry Kilometreage) in the idea?
> Just thought to make the sound like the sender there could be a real
> time slowed down session of key words to build the diphone library prior
> to the contact so the following QSO would sound nearly normal. This
> library would build over time so the system training would only need one
> session for a particular stn then on future QSOs a call sign entry would
> only be needed...... better stop now I am scaring myself. Maybe get it
> all on one PIC...... not?
> http://en.wikipedia.org/wiki/Speech_synthesis
>
> 73 es GL Pete M0FMT IO91UX
>
> *From:* Holger 'Geri' DK8KW DI2BO W1KW <[email protected]>
> *To:* "[email protected]" <[email protected]>
> *Cc:* "<[email protected]>" <[email protected]>
> *Sent:* Friday, 21 December 2012, 11:16
> *Subject:* Re: LF: Re: 477 NOV What Modes ?
>
> Markus and I once had a successful "Slow SSB" QSO on 137 kHz years
> ago in our German 800 Hz bandwidth limitation. We slowed down normal
> voice four times, transmitted it over SSB and expanded it again by
> reversing the process ... using the full 7 kHz would make a fine AM
> signal, indeed ... perhaps even a low deviation FM signal would do?
>
> Be creative, by 73
>
> Geri, DK8KW
>
> m
> On 21.12.2012, at 10:34, "Chris" <[email protected]
> <mailto:[email protected]>> wrote:
>
>> All modes, as per the licence and 136/7 band.
>> Roger, yes, a couple of us are thinking about some QRP AM across
>> town (subject to non QRM to other locals), and why not?
>> Some sort of agreed band plan would be helpful ASAP as well.
>> My two NoVs were dated 20th. December, but it does say 'Date of
>> Issue', which isn't the same as 'Date of Commencement', 'With
>> Effect From' or whatever. It was clear from the Ofcom site where
>> the link was that the NoV comes into effect on 1st. January.
>> Vy 73, Chris, G4AYT, Whitstable, Kent.
>>
>> ----- Original Message -----
>> *From:* Graham <mailto:[email protected]>
>> *To:* [email protected]
>> <mailto:[email protected]>
>> *Sent:* Thursday, December 20, 2012 5:04 PM
>> *Subject:* LF: 477 NOV What Modes ?
>>
>> Starting 1/1/13 .. but What Modes non listed , only
>> the power ??
>>
>> G..
>>
>
>
>
>
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