On Thu, 15 Sep 2005 03:45:34 GMT, in rec.audio.pro KenLac
wrote:

Richard Crowley wrote:
Back in the good old days of video tape (before VHS and then
cassettes), big 2-inch quad reel-to-reel transports could "chase"
even during FF and Rewind.

Yeah, but I'll bet that was based on "tach" pulses rather than pure SMPTE.

If I recall correctly, the Studer 24 track machines would "chase" at
high speeds by motor tach signals, and then, when it got close to the
target the tape would come near enough to the heads to actually taste
the timecode and bring it back to perfect sync. Up until that last step
it was just guessing how many revolutions of the motor it would take to
keep it in sync.
Almost... The studerA80 TLS used the tach signals from the tape path
idler, it didnt have motor tachs.The tape tach was accurate to about a
second in a full reel of tape, so the timecode sync was reletive easy
to do.
One day there was a client who wanted a 4 tr Studer in a video
editing suite (1" C format days). So we got a CMX editor inteface,
glued it into a standard A80. That was so impressive, the studer TLS
was a donkey in comparison to the CMX.

end irrelevant ramble


martin