Time code

Time code

A time code is a sequence of numeric codes generated at regular intervals by a timing system. Time codes are used extensively for synchronization, and for logging material in recorded media. SOM is also a related term (in the broadcast industry) and stands for 'Start of Message' or 'Start of Media' also known as Time Code (TC) in. Similarly EOM stands for 'End of Message' or 'End of Media' also known as Time Code (TC) out.

Common time code formats

The SMPTE time code family of timecodes are almost universally used in film, video and audio production, and can be encoding in many different formats:
*Linear timecode
*Vertical interval timecode

Other related time and sequence codes:
*Burnt-in timecode
*CTL timecode
*MIDI timecode
*AES-EBU embedded timecode
*Rewritable consumer timecode
*Keykode

Time codes for purposes other than video and audio production:
* IRIG time codes Used for military, government and commercial purposes.

ee also

* Global Positioning System
* Network time protocol
* Time signal
* Timestamp, denoting the date/time in data logging
* Trusted timestamp, part of a digital signature
* Jam sync
* Binary Coded Decimal

References

* "Timecode: A user's guide, second edition" by John Ratcliff, [Focal Press]
* "A Technical Introduction to Digital Video" by Charles Poynton

External links

* [http://www.alpermann-velte.com/proj_e/tc_intro/tcintro.html Introduction to the Basic Principles of the SMPTE/EBU Time Code]
* [http://www.saxmusicplus.com/?p=157 Audio Synchronization and Time Code explained]
* [http://lurkertech.com/lg/timecode/ Technical intro to Time Code as a numbering scheme, data stamp, electrical signal (LTC/VITC/D-VITC/AES), and tape signal]


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