Vertical interval timecode

Vertical interval timecode

Vertical Interval TimeCode (VITC, pronounced "vitsee") is a form of SMPTE timecode embedded as a pair of black-and-white bars in a video signal. These lines are typically inserted into the vertical blanking interval of the video signal. There can be more than one VITC pair in a single frame of video: this can be used to encode extra data that will not fit in a standard timecode frame.

VITC contains the 64 data bits of the SMPTE linear timecode frame embedded in a new frame structure with extra synchronization bits and an error-detection checksum. The VITC code is always repeated on two adjacent video lines, one in each field. This internal redundancy is exploited by VITC readers, in addition to the standard timecode "flywheel" algorithm.

A video frame may contain more than one VITC code if necessary, recorded on different line-pairs. This is often used in production, where different entities may want to encode different sets of time-code metadata on the same tape.

As a practical matter, VITC can be more 'frame-accurate' than Linear timecode (LTC), particularly at very slow tape speeds on analog formats. LTC readers can lose track of code at slow jog speeds whereas VITC can be read frame-by-frame if need be. At high speeds (FF/REW), the VITC is often unreadable due to image distortions, so the LTC is often used instead. Some VCRs have an auto selection between the two formats to provide the highest accuracy.

See also

Related technologies and standards
* Linear timecode
* Burnt-in timecode
* CTL timecode
* MIDI timecode
* AES-EBU embedded timecode
* Rewritable consumer timecode

External links

* [ Introduction to the Basic Principles of the SMPTE/EBU Time Code]

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Vertical Interval TimeCode — Darstellung eines VITC in einem PAL Signal Der Vertical Interval TimeCode (VITC, sprich vit si ) ist eine Zeitcodierung mit Zeitstempel (Timecode) bei der Magnetbandaufzeichnung. So kann z. B. jedes Bild einer Videoaufzeichnung adressiert… …   Deutsch Wikipedia

  • Vertical interval — A&V The portion of the video signal that occurs between the end of one field and the beginning of the next. During this time, the electron beams in the cameras and monitors are turned off (invisible) so that they can return from the bottom of the …   Audio and video glossary

  • Timecode (temporel) — Pour les articles homonymes, voir Timecode. Un timecode, ou code temporel[1], est une référence temporelle, suite de codes numériques générés à intervalles réguliers par un système de marquage de temps, utilisé dans les domaines du son et de l… …   Wikipédia en Français

  • Timecode — in einer digitalen Arbeitskopie. Mit Hilfe des Timecodes (TC), Zeitcode bzw. Zeitstempel wird jedes Bild in einem Film exakt bestimmt. Der Timecode setzt sich aus der Angabe Stunde, Minute, Sekunde und Bild Nummer/Frame (dieser Sekunde) zusammen …   Deutsch Wikipedia

  • Timecode (indicateur) — Timecode (temporel) Mire de barre et Timecode incrusté Le Timecode a été développé à l origine pour la télévision à l époque du noir et blanc. Ce qui explique ses limites. le TC est une forme de metadata. Le time code est une référence temporelle …   Wikipédia en Français

  • TimeCode — Der Timecode (TC), Zeitcode bzw. Zeitstempel entstand aus dem Wunsch der Filmemacher, Ton und Bild exakt zu synchronisieren beziehungsweise Dokumentarfilme ohne das Schlagen einer Klappe drehen zu können. Heutzutage findet er sowohl im Film als… …   Deutsch Wikipedia

  • 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 …   Wikipedia

  • CTL timecode — CTL (control track longitudinal) timecode, developed by JVC in the early 1990s, is a unique technique for embedding, or striping , reference SMPTE timecode onto a videotape.Similar to the way VITC timecode is embedded in the vertical interval… …   Wikipedia

  • Rewritable consumer timecode — The Rewriteable Consumer Timecode (RCTC, RC Timecode, or RC Time Code) is a nearly frame accurate timecode method developed by Sony for 8mm and Hi8 analog tape formats [ Sony CCD V801 Manual] Page 9… …   Wikipedia

  • Linear timecode — Linear (or Longitudinal) Timecode (LTC) encodes SMPTE timecode data as a Manchester Biphase encoded audio signal. The audio signal is commonly recorded on a VTR track or other storage media. Each frame is terminated by a sync word which has a… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”