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From: David Cubero on 5 Jul 2010 19:07
The problem is that the demodulated signal is a pattern (which is always the same) + data which varies.
From: Walter Roberson on 5 Jul 2010 19:22
David Cubero wrote:
> The problem is that the demodulated signal is a pattern (which is always
> the same) + data which varies.

Charlie Brown: You just want me to come running up to kick that ball so you
can pull it away and see me lying flat on my back and kill myself.

Lucy: This time you can trust me. See, here is a signed document testifying
that I promise not to pull it away.

Charlie Brown: It is signed! It’s a signed document. I guess if you have a
signed document in your possession, you can’t go wrong. This year I am really
going to kick that football.

[runs up to kick the ball, but Lucy pulls it away and he falls flat on his
back]. AARG!

Lucy: Peculiar thing about this document–it was never notarized.
From: ImageAnalyst on 5 Jul 2010 21:02
On Jul 5, 7:07 pm, "David Cubero" <sird...(a)hotmail.com> wrote:
> The problem is that the demodulated signal is a pattern (which is always the same) + data which varies.

--------------------
Why don't you supply some examples of your data, both the short
pattern, and the longer signal? You can supply MATLAB code to
generate a signal, or supply a file to http://drop.io along with some
code to read the signal.
From: David Cubero on 6 Jul 2010 05:28
The data file is: 39 words of synchro + 47word of space data+ 909words of the picture
This data repeat periodically changing the words of the picture

I know how should be the synchro: 7 square pulses with a freq of 1040Hz and duty ratio 50%

So I want to detect them n the big signal
From: Walter Roberson on 6 Jul 2010 06:28
David Cubero wrote:
> The data file is: 39 words of synchro + 47word of space data+ 909words
> of the picture
> This data repeat periodically changing the words of the picture
>
> I know how should be the synchro: 7 square pulses with a freq of 1040Hz
> and duty ratio 50%
>
> So I want to detect them n the big signal

Is there something that prevents the header (synchro and space) from
appearing as picture data? For example is the picture encoded in such a
way that it is impossible for as much as 47 words of spaces to appear in
a row?
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