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About This Item


Full Description

This Standard specifies a time and control code for use in television and accompanying audio systems operating at nominal rates1 of 60, 59.94, 50, 48, 47.95, 30, 29.97, 25, 24, and 23.98 frames per second. This standard defines a time address, binary groups, and flag bit structure. The standard also defines a binary group flag assignment, a linear time code transport, and a vertical interval time code transport.

This standard defines primary data transport structures for Linear Time Code (LTC) and Vertical Interval Time Code (VITC). This standard defines the LTC modulation and timing for all video formats. This standard also defines the VITC modulation and location for 525/59.94 and 625/50 analog composite and component systems only.

Note: The digital representation of analog VITC (D-VITC) is specified in SMPTE ST 266 and is defined for 525/59.94 and 625/50 digital component systems only. High Definition formats, such as those documented in SMPTE ST 2048-2, SMPTE ST 274, and SMPTE ST 296, use Ancillary Time Code (ATC) as specified in SMPTE ST 12-2 (formerly SMPTE RP 188) for transport of time code in the digital video data stream. For future implementations of time code for digital Standard Definition formats, the use of ATC rather than D-VITC is encouraged.

Document History

  1. SMPTE ST 12-1:2014


    Time and Control Code

    • Most Recent
  2. SMPTE 12M-1-2008

    Television - Time and Control Code (Revision of SMPTE 12M-1999, RP 159-1995 and RP 164-1996)

    • Historical Version
  3. SMPTE 12M-1999

    Television, Audio and Film - Time and Control Code

    • Historical Version
  4. SMPTE RP 164-1996

    Location of Vertical Interval Time Code

    • Historical Version
  5. SMPTE RP 159-1995

    Vertical Interval Time Code and Longitudinal Time Code Relationship

    • Historical Version