Vertical Interval Timecode

Information about Vertical Interval Timecode

Vertical Interval TimeCode (VITC, pronounced "vitsee" or sometimes "vits") 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 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.

[ edit ] Video formats
Analog broadcast
525 lines: NTSC \| NTSC-J \| PAL-M
625 lines: PAL \| PAL-N \| PALplus \| SECAM
Defunct systems: Pre-1940 \| 405 lines \| 819 lines \| Baird-Nipkow \| MAC \| MUSE
Multichannel audio: BTSC (MTS) \| NICAM-728 \| Zweiton (A2, IGR)
Hidden signals: Captioning \| Teletext \| CGMS-A \| GCR \| PDC \| VBI \| VEIL \| VITC \| WSS \| XDS
Digital broadcast
Interlaced: SDTV (480i, 576i) \| HDTV (1080i)
Progressive: LDTV (240p, 288p, 1seg) \| EDTV (480p, 576p) \| HDTV (720p, 1080p)
Digital TV standards: MPEG-2: ATSC, DVB, ISDB \| MPEG-4: SBTVD
Multichannel audio: AAC (5.1) \| Musicam \| PCM \| LPCM
Hidden signals: Captioning \| Teletext \| (CPCM/Broadcast flag) \| AFD \| EPG
Digital cinema: UHDV (2540p, 4320p) \| DCI \| 22.2 audio
Technical issues: \| MPEG transport \| Standards conversion \| Video processing \| VOD

SMPTE timecode is a set of cooperating standards to label individual frames of video or film with a timecode defined by the Society of Motion Picture and Television Engineers in the SMPTE 12M specification.
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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.
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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.
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Burnt-in timecode (often abbreviated to BITC by analogy to VITC) is a human-readable on-screen version of the timecode information for a piece of material superimposed on a video image.
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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.
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MIDI time code (MTC) embeds the same timing information as standard SMPTE time code as a series of small 'quarter-frame' MIDI messages. There is no provision for the user bits in the standard MIDI time code messages, and SysEx messages are used to carry this information instead.
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AES-EBU embedded timecode is an embedded timecode format used to embed SMPTE timecode data within AES/EBU digital audio signals. It can be used for synchronization and for logging and identifying audio content.
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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 formats¹.
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A video format describes how one device sends video pictures to another device, such as the way that a DVD player sends pictures to a television, or a computer to a monitor.
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This article needs copy editing for grammar, style, cohesion, tone and/or spelling.
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This article has been tagged since October 2007.
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NTSC-J is an analog television system and video display standard for the region of Japan.

Technical definition

It is based on 'regular' NTSC, but is slightly different.
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PAL-M is the TV system used in Brazil since February 19, 1972. At that time, Brazil was the first country in South America with broadcasting in color. Rede Bandeirantes passed to PAL-M that year, while other television stations - like Rede Globo and Tupi - made a progressive and
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PAL, short for Phase Alternating Line, is a colour encoding system used in broadcast television systems in large parts of the world. Other common analogue television systems are SECAM and NTSC.
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PALplus is an extension of the PAL analogue broadcasting system for transmitting programs without sacrificing vertical resolution. A standard PAL receiver will display the image in letterbox format with 432 active lines, while a PALplus
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SECAM, also written SÉCAM (Séquentiel couleur à mémoire, French for "Sequential Color with Memory"), is an analog color television system first used in France.
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ITU System Letter Designation

The EMI system is officially known as System-A. As the EMI system predates PAL, there is no PAL designator in the ITU television system table.

USSR

USSR 1932 (mechanical): 30 lines, 12.

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The 405-line monochrome analogue television broadcasting system was the first electronic television system to be used in regular broadcasting. It was introduced with the BBC Television Service in 1936, suspended for the duration of World War II, and remained in operation in the UK
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Mechanical television was a television system that used mechanical or electromechanical devices to capture and display images. However, the images themselves were usually transmitted electronically and via radio waves.
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Multiplexed Analogue Components (MAC) was a satellite television transmission standard, originally proposed for use on a Europe-wide terrestrial HDTV system, although it was never used terrestrially.
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Multichannel television sound, better known as MTS (often still as BTSC, for the Broadcast Television Systems Committee that created it), is the method of encoding three additional channels of audio into an NTSC-format audio carrier.
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NICAM stands for Near Instantaneous Companded Audio Multiplex. It is an early form of lossy compression for digital audio. It was originally developed in the early 1970s for point-to-point links within broadcasting networks.
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Zweikanalton ("two channel sound") is a television sound transmission system used in Germany and other countries. It relies on two separate FM carriers. This offers relatively high separation between the channels (compared to a subcarrier-based multiplex system) and can thus be
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The introduction to this article may be too long. Please help improve the introduction by moving some material from it into the body of the article according to the suggestions at Wikipedia's .
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Teletext (or "broadcast Teletext") is a television information retrieval service developed in the United Kingdom in the early 1970s. It offers a range of text-based information, typically including national, international and sporting news, weather and TV schedules.
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Copy Generation Management System - Analog (CGMS-A) is a copy protection mechanism for analog television signals. It is not related to the Broadcast flag, which is designed for use in digital television signals.
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Ghost-canceling reference, or GCR, is a special sub-signal on a television channel that receivers can use to attenuate the ghosting effect of a television signal split into multiple paths between transmitter and receiver.
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For other meanings, see Startext (disambiguation).

Programme Delivery Control (PDC) is a standard (ETS 300 231) to control video recorders using hidden codes in the teletext service.
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Video Encoded Invisible Light (VEIL) is a technology for encoding low-bandwidth digital data bitstream in video signal, developed by VEIL Interactive Technologies. VEIL is compatible with multiple formats of video signals, including PAL, SECAM, and NTSC.
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