Longitudinal timecode

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Longitudinal (or linear) time code (LTC) , pronounced "lit-si", is a type of time code that is recorded on certain magnetic tapes (e.g. SVHS ) along the tape. Usually an audio track is sacrificed for this.

The advantages of LTC are that, in contrast to Vertical Interval Timecode (VITC), it can also be read out while the tape is fast forward and it can also be recorded later.

The disadvantage of LTC is that it cannot be read in the still image or during slow tape forwarding, which is possible with VITC.

In sound engineering, LTC plays a key role in the synchronization between several analog tape machines or a tape machine and a digital audio workstation (DAW). One or more devices are subordinate to a "master" as "slaves". You follow the movements and actions of the master on the timeline as quickly as possible. The same principle is used to synchronize tape machines, sequencers , DAWs and film projectors .

literature

  • Hubert Henle: The recording studio manual. 5th edition, GC Carstensen Verlag, Munich, 2001, ISBN 3-910098-19-3