Path: utzoo!attcan!uunet!cs.utexas.edu!tut.cis.ohio-state.edu!ucbvax!hplabs!hp-pcd!hplsla!tomb
From: tomb@hplsla.HP.COM (Tom Bruhns)
Newsgroups: sci.electronics
Subject: Re: Animatronics toys
Message-ID: <5170039@hplsla.HP.COM>
Date: 8 Jun 89 15:25:56 GMT
References: <7055@cbmvax.UUCP>
Organization: HP Lake Stevens, WA
Lines: 27

adam@cbmvax.UUCP ( CATS) writes:
...
>
>Has anyone discovered the protocol Teddy uses to control Grubby?
>Does anyone have a Teddy Ruxpin audio cassette (or Teddy himself)
>I could borrow to study the encoding scheme?
>
>I bought Grubby at a steep discount and would like to build an
>interface box so he'll move to any audio input.
>
>Thanks for any insight,  Adam

Hope this helps:  we have a Teddy R., and I looked at the cassette
audio.  Put one in a stereo deck and you see audio out one channel,
and a train of pulses out the other.  The pulses appear to be very
similar to those used in some radio control schemes, so an RC chip
might be just what the Dr. ordered to decode or encode.  I think 
there were groups of pulses, separated by a little time, and the
pulse position of each pulse past the initial pulse appeared to
control one of the "animation" functions:  Teddy's jaw, his eyes,
etc.  I seem to remember six channels (seven pulses).  If you e-mail
me, I might be willing to look again and get some timing info for you.
I presume that this pulse train is just fed off to the junior member
of the partnership...but I don't know.

Tom Bruhns
tomb%hplsla@hplabs.hp.com