MOTU Micro Lite [134/166] Drop out

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.