SMPTE timecode
（重定向自SMPTE Time Code）
![SMPTE timecode signal (A 1 is expressed by a transition at the midpoint of a period. A 0 is expressed by the absence of such a transition.) compared to the outwardly-similar Manchester code (A 0 is expressed by a high-to-low transition, a 1 by low-to-high transition at the midpoint of a period).](/Images/godic/202502/11/EmbeddedSynchronousSignalling5308.png")
SMPTE timecode is a set of cooperating standards to label individual frames of video or film with a time code defined by the Society of Motion Picture and Television Engineers in the SMPTE 12M specification. SMPTE revised the standard in 2008, turning it into a two-part document: SMPTE 12M-1 and SMPTE 12M-2, including new explanations and clarifications.