Re: IR Extender... Revisited!

["Stuart Whyte" <stuart@xxxxxxx>]

Ian,

Happy to offer any help I can.

Stuart

--- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
> Sounds reasonable on the face of it. RS do receivers and
transmitters
> compatible with IRDA 1.1. The only thing not 'very' clear is the
output from
> the remote and hence the receiver. It said  the receiver output was
> compatible with an IC running an IRDA compatible demodulator. This
is the
> bit I would have to look seriously into. To read for yourself goto
> www.rswww.com and search using IRDA. I think getting the remote and
a scope
> together would be the way forward there. I can also see some flat
remote
> batteries if I have anything to do with it. If I am to incorporate
this into
> the 'SmartIR' devices I am building we will have to move reasonably
quickly.
> I would also have to delegate some of the legwork so volunteers are
wanted.
> Legwork is finding out how the signal is composed and how to
recreate it so
> come on guys, running shoes on, lets go.
>
> I will get a receiver and maybe a transmitter in the near future
and have a
> play. At the end of the day we don't care what is transmitted, just
how it
> is fired out of the emitter.
>
> Ian
>
>
>
> > -----Original Message-----
> > From: KIFF, Graham, FM [mailto:graham.kiff@xxxxxxx...]
> > Sent: 16 August 2001 15:15
> > To: 'ukha_d@y...'
> > Subject: RE: [ukha_d] IR Extender... Revisited!
> >
> >
> > Here's some information I got directly from Pace on the subject:
> >
> > Hello
> > I am sorry but I do not know of a universal handset or remote
> > extender that
> > will control your digital cable box due to a completely different
> > system of
> > I.R. modulation being used by the Pace cable receiver handsets .
> >
> > The system used was chosen by our customers ( the network
> > providers ) and is
> > a high speed system that gives some " future proofing "
 of the
> > design . The
> > system is  designed for remote keyboard use ( Web browsing ) and
to enable
> > multiple handset to be used " simultaneously " as
required when
playing
> > games . This is because at some time in the near future the
network
> > providers  will offer these services .
> >
> > "Normal" handsets use a system of modulating (switching
on and
off ) a
> > carrier signal . The normal frequency of the carrier being in the
range of
> > 35kHz to 60kHz..
> >
> > The system used by Pace uses TWTV protocol which is based on the
IRDA
> > standard that has been designed to enable computer peripherals to
> > be linked
> > without cables . ( This is not surprising  as modern digital
cable set top
> > boxes contain a powerful micro processing systems and the Pace
> > boxes are the
> > first to also provide an integrated  cable modem within the box.)
The
> > handset data is transmitted as discrete pulses of IR - it is not
carrier
> > based . The pulse rate is approximately 115kHz . The handsets
have
> > identification keys / tabs that  enable the receiver to identify
> > the handset
> > . Each key sends a 7 byte package of data within 600uSec (  the
same time
> > that it taken to send only 1 or 2 bits of information with the
> > normal system
> > ) . This allows the data to be sent very quickly thus freeing
time for a
> > second handset to jump in . The receiver software also adds a
> > time stamp to
> > the data to enable the games programmes to decide which handset
responded
> > first . The system and protocols used are covered by patents hel
> > d by TWO WAY TV LTD .
> >
> > I hope this answers your query but should you have any further
queries
> > please contact me again.
> >
> > Regards
> > Craig Charlwood
> > Technical Support - Service
> > Pace Micro Technology plc www.pace.co.uk <http://www.pace.co.uk>
> >
> >
> > > If it is just the modulation frequency then I could probably
> > build it into
> > > the current PIC based model. Each transmitter unit would be
> > selectable for
> > > IRDA or normal IR via a jumper. The only other hurdle would
be
the
> > receiver
> > > unit. For IR they are nice off the shelf units.
> > >
> > > Does anyone know whether IRDA is simply a higher frequency
and
are there
> > > receivers available off the shelf. Ideally these would
output a
> > modulated
> > > signal i.e. no carrier just like the TSOP 1838's we all know
> > and love from
> > > the current IR units.
> > >
> > > Ideas folks
> > >
> > > Ian
> > >
> > > > -----Original Message-----
> > > > From: James Hoye [mailto:james.hoye@xxxxxxx...]
> > > > Sent: 16 August 2001 14:54
> > > > To: ukha_d@y...
> > > > Subject: RE: [ukha_d] IR Extender... Revisited!
> > > >
> > > >
> > > > > Stuart, I have exactly the same problem.  So if
you get any
> > > > > information on this subject or anyone else has any
ideas, I
will
> > > > > be eternally grateful!
> > > >
> > > > Perhaps Mr Bird would look at making an IrDA
compatibile
> > version - is it
> > > > just the modulation frequency that's much higher, or is
it a
> > completely
> > > > different protocol (ie. no carrier, PWM, PPM or any
other
acronym you
> > care
> > > > to imagine).  Someone (Keith) is probably now going to
tell me
> > > > that carrier
> > > > modulation is the same as PWM/PPM/whatever :)
> > > >
> > > > James H
> > > >
> > > >
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