Recording
Time code is a synchronisation system that assigns a unique numerical address to each frame of audio or video, allowing multiple devices to operate in perfect time alignment. It is used to synchronise recorders, sequencers, video decks, and editing systems across professional production environments.
Time code provides a precise reference that enables separate machines or software systems to stay locked together during recording, playback, or post-production. Each frame is given a timestamp consisting of hours, minutes, seconds, and frames. This allows devices to locate, start, and maintain synchronisation with exact accuracy, ensuring that audio, video, and automation data remain in sync throughout a session.
The most widely used format is SMPTE time code, established by the Society of Motion Picture and Television Engineers. It can be recorded as an audio signal known as LTC (Longitudinal Time Code), embedded in video signals as VITC (Vertical Interval Time Code), or transmitted digitally through protocols like MIDI Time Code (MTC). Common frame rates include 24, 25, 29.97, and 30 frames per second, corresponding to film, PAL, and NTSC standards.
In audio production, time code is critical for locking multitrack recorders, DAWs, video machines, and automation systems to a shared clock reference. For example, a tape machine may chase the time code generated by a master DAW to maintain perfect positional accuracy. It also enables precise editing, dubbing, and recall of automation events.
While modern digital systems can share timing information over network or word clock connections, SMPTE time code remains a fundamental reference standard. Its reliability and compatibility make it indispensable wherever precise synchronisation between multiple devices is required.
