Mike,

On Fri, 11 Feb 2005 13:50:26 -0500, crayola@optonline.net wrote:

> A while back I asked for some help regarding converting
> a stream of data (made up from the following set of data)
> into an audio signal that could be recorded on a cdrom.=20
> When the audio was played back it needs to be converted=20
> back into the original stream of data and fed out a serial=20
> connection (to control some servos).
>=20
> Sync/Command bit     Servo number            Position
> 255                           1-254                        1-254
> =09
> Several of you suggested looking into a modem on a chip type
> IC to do the generation and decoding of the audio and them record
> audio or process the resulting data. I looked into this quite a=20
> bit but I cant seem to find a modem IC that doesn=C6t require=20
> training/synchronization to occur before sending or receiving data.=20

You're talking about chips designed for full-duplex cable communications.=
  Did you look at the MX614P as sold=20
by "Glitchbuster"?  It's used (among other things) for Amateur Radio Pack=
et modems - and they certainly don't=20
"train or synchronise" because the communication is one-way at a time (an=
d there may be multiple recipients) =20
and any error detection and correction is done higher up the stack.  Have=
 a look at =20
http://www.glitchbuster.com  and follow the link he has to a project usin=
g it.

Cheers,


Howard Winter
St.Albans, England



--=20
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