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animation data system used for Teddy and Grubby is much the same as the
8 channel digital proportional system used for model airplanes. There
are 9 short pulses in a row, the time gap between successive pulses is
the information for each channel.
data is recorded 'raw' on the tape, no sub-carrier is used. Because
of this, polarity and shape of the signal is important for reliable
operation. By modern standards it is quite a crude system, but electronics
were less sophisticated in 1985. Incidentally,
Mother Goose, Mickey and Snoopy use a similar system which has 16 channels.
The last 8 contain a key code that makes a tape work only in the right
toy. A custom decoder chip was used in them that recognizes the 'key'.The
small Teddy Ruxpin uses a single servo, and has only one data channel
- I believe it is frequency modulated, I never picked it apart.
1 is not used.Channel
2,3,4 are Teddy's eyes, upper and lower jaw.Channel
5 controls if audio comes from Grubby, Teddy or both.
6,7 and 8 control Grubby's eyes, upper and lower jaw.
Ruxpin's tape player is actually a stereo player. The prerecorded
tapes have animation data recorded along side the audio tracks. The
right channel contains the data, the left channel the audio programme.
Putting an ordinary tape in Teddy Ruxpin often won't work. There are
two reasons for this, one is obvious, the other isn't. An
ordinary cassette tape that wasn't specifically made for Teddy Ruxpin
doesn't contain anything that his electronics can decipher as animation
data (Or atleast enough to be coordinated). Second the 'spine' of the
cassette housing has some additional tabs knocked out (Like
very high bias metal tapes) that corresponds to a microswitch trigger.
If this switch isn't moved Teddy will not animate.
for the first version of Teddy Ruxpin