Your right. I tried:
echo "STARTSTARTSTARTSTARTSTARTSTARTSTARTSTARTSTARTSTARTSTARTSTART the
quick brown fox jumped over the lazy dog. the quick brown fox jumped over
the lazy dog. the quick brown fox jumped over the lazy dog.
ENDENDENDENDENDENDENDENDENDENDENDENDENDENDENDENDEND" | ./fdmdv_mod - - |
./fdmdv_demod - - | cat -
and got this back:
����.��TSTARTSTARTSTARTSTARTSTARTSTARTSTARTSTARTSTART the quick brown fox
jumped over the lazy dog. the quick brown fox jumped over the lazy dog. the
quick brown fox jumped over the lazy dog. ENDENDENDENDENDENDENDENDE
So any digital data would have to have a reasonable pre/postamble before
content is actually sent. This is probably not a problem for digital voice
as it will only mean a few tens of milliseconds at either end.
Cheers,
Stuart
On 15 May 2012 23:21, <si...@mungewell.org> wrote:
>
> > So the first 11 bytes are corrupted and the last 21 are clipped. I assume
> > the modem is built mostly for codec2 but it may be good to be able to
> > interleave any needed digital data.
>
> There will always be some sync time at the start, and the end might be
> missing as it doesn't extend the data to ensure the last (full) block is
> sent.
>
> Try pre-pending and appending some '_' (or something) characters to your
> test string
> Simon
>
>
>
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