Tamas Jalsovszky wrote:
Steve Underwood wrote:
Tamas J wrote:
Hello,
I have seen that SpanDSP supports V.17 faxing, however when I tryed to
send pages, I eneded with very ugly pages (unreadable). Did anybody else
try that?
Yes, I checked frame slips and clocking on PRI, everything has to be OK.
Regards,
Tamas
V.17 is disabled in spandsp. There is a reason for that.
Regards,
Steve
What is that reason? ;)
How much work is needed to have v.17 working? Yes, depends on who makes
the work ;) Do you think a newbie in fax protocols can make it in
reasonable time?
Being a fax protocol newbie is no problem at all. Being a DSP newbie
might be. :-)
The missing bit is making the V.17 modem's carrier and symbol sync crisp
enough to acquire the signal on the short training sequence. I think
everything else is basically in place. Of course, it needs extensive
testing once the missing piece is in place. I haven't touched that modem
code for ages, as it hasn't bubbled up the priority list enough.
IBM had a patent related to the trellis coding in V.17, but I think that
has expired. As far as I know there are no longer patent issues with
V.17. If someone knows otherwise, please tell me. V.17 is basically one
half of V.32bis, so the patent issues should be similar.
Regards,
Steve
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