APPENDIX A: GLOSSARY
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Drop-out: A brief period of missing information in a
continuous signal, such as a video signal or SMPTE time
code signal. Drop-outs are usually caused by small,
physical imperfections in the surface of the tape on which
the signal is recorded.
Flywheeling: Another name for Freewheeling. See
Freewheeling below.
Freewheeling: A process in which a synchronizer, such as
the MIDI Express XT, continues to generate time code
even when it encounters drop-outs in a time code source.
Converters may briefly lose synchronization during a
drop-out and, in turn, momentarily stop converting time
code. The MIDI Express XT can freewheel up to 32
frames, making it insusceptible to drop-outs.
FreeMIDI: A Mac OS 9 system extension developed by
MOTU. FreeMIDI provides centralized, comprehensive
MIDI system management under Mac OS 9.
Genlock: A process in which a video generator (graphics,
picture, or VITC) is locked in phase with an external
source.
Guard Track: An empty track adjacent to the LTC track on
a multitrack tape recorder. A guard track prevents
crosstalk from another track, which can interfere with the
time code and cause synchronization problems.
Hard Record: A mode on a VTR that erases and records all
tracks simultaneously.
Horizontal Blanking: A short period of time in the video
display process in a CRT when the electron beam is shut
off to retrace to the next horizontal scan line (similar to a
carriage return on a typewriter).
House Sync: A process in which all video equipment in a
studio is connected to and genlocks to a single video sync
generator.
Input cable: One of the eight (or sixteen) MIDI IN jacks in
a MIDI Time Piece network.
Insert Record: A mode on a VTR that records on the video
tracks without recording on the audio tracks, or vice versa.
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