Rick wrote:
> I have to concur with Jose on this. I was a very active HF and VHF
> digital ham starting around 1981 with a homebrew XR2206/XR2211 TU that
> was from QST magazine and called "The State of the Art TU." It most
> assuredly was not, but being naive and new to RTTY found it to be a v
One thing to try might be an encoding that takes more time to send than
the audio it encodes. If blank space compression is used, the effect
can be reduced. But there is nothing that says the encoding must be
able to transmit voice in 100% of real time to be interesting or
useful.
73,
Leigh/W
I did send you a PM.
Cesco,
RR for all
> At each 1/T it was necessary to send NxL elements of
>information, which gives the final rate.
This corresponds to your calculation:
>23 * 3 bit = 69 bit per 40ms. 69*25=1725 bps. More than enough for the
>1400bps codec. I can help you with this codec if needed.
Yes 1725 bps
My problem is that if I can't find someone to help me get started, the
project will die with my tow papers.
Miken6ief
> Very low bitrate algorithms exist now. There are a few that operate from
> 200 bps to 600 bps. The Navy has software called IVOX that gets in this
> range.
Can you somehow lay hands on such a 200 to 600 bps codec?
Im VERY intrested.
The IVOX thing is based on 2400 bps lpc. With silence detec
Yes it is
Steinar Aanesland wrote:
> Is this the IVOX system:?
>
> http://downloads.pf.itd.nrl.navy.mil/ivox/
>
> LA5VNA Steinar
>
>
>
>
> W2XJ skrev:
>
>>
>>Very low bitrate algorithms exist now. There are a few that operate from
>>200 bps to 600 bps. The Navy has software called IVOX th
Hi Patrick,
> At each 1/T it was necessary to send NxL elements of
>information, which gives the final rate.
Im not shure i understand your method 100%.
My own tests found that you can transfer comprehensible, but unvoiced
speech with 10 carriers. But i did not restrict number of levels. For
Is this the IVOX system:?
http://downloads.pf.itd.nrl.navy.mil/ivox/
LA5VNA Steinar
W2XJ skrev:
>
>
> Very low bitrate algorithms exist now. There are a few that operate from
> 200 bps to 600 bps. The Navy has software called IVOX that gets in this
> range. So you could transmit 16 QAM and hi
Very low bitrate algorithms exist now. There are a few that operate from
200 bps to 600 bps. The Navy has software called IVOX that gets in this
range. So you could transmit 16 QAM and hit the 100 HZ goal. The bigger
problem would be getting it to survive propagation and survive receiver
filte
I have waited a couple of days, but since few constructive comments
other than Andy, will try and take this into consideration to form the
best approach that I can come up with. Separate groups to discuss sub
issues are not generally successful and are developed primarily to keep
the "trouble m
Brian,
A minor correction to the statement "WF1B supported quite a few TU types but no
sound cards."
RTTY by WF1B supported the RITTY program by Brian, K6STI.
http://www.eham.net/reviews/detail/235
73 de Bob - KØRC in MN
- Original Message -
From: Brian A
To: digitalradio@ya
--- In digitalradio@yahoogroups.com, "Jose A. Amador" <[EMAIL PROTECTED]> wrote:
>
>
> Misko,
>
> Most likely the module for the old NIC is no longer adequate for the
new
> NIC. Look for the proper module and install it.
>
> Jose, CO2JA
>
> Miroslav Skoric (YT7MPB) wrote:
>
> > Recently I c
Hello Cesco,
For information, I have tried to see if it was possible to transmit a speech
through a 500 Hz channel using a digital transmission. I have decomposed the
audio spectrum (but not through a FFT, but by intercorrelation to choose the
carriers I wanted) in several carriers and associat
Rick,
I used a CP-1 TU up to the day the WF1B RTTY contest program became
unsupported. WF1B supported quite a few TU types but no sound cards.
That was around 1996 or 7.
Here's a tidbit of info.
Score required to win 1997 USA CQ WW RTTY single op assisted in 1997 =
553k points. I still have the
I have to concur with Jose on this. I was a very active HF and VHF
digital ham starting around 1981 with a homebrew XR2206/XR2211 TU that
was from QST magazine and called "The State of the Art TU." It most
assuredly was not, but being naive and new to RTTY found it to be a very
poor performer.
Howard is looking at this correctly and fairly. It is very unfortunate
that instead of making suggestions to improve the questions to the FCC,
Bonnie, KQ6XA, has again used personal attack, and does so only with
absolutely no explanation of what she is criticizing. She did this
recently on QRZ
I would be plased to have a complete list of the phonemes and corresponding
audio files from different speakers. I fear 44 phonemes will not be enough
to do a context-free analisis.
The data rate will be closer to 200pbs i think, since you will have to
transfer a magnitude component along with
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