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Topic: Vertical interval timecode

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	vitc (Site not responding. Last check: 2007-10-21)
		Vertical interval timecode (VITC, pronounced "vitsee" or sometimes "vits") is a form of SMPTE timecode embedded as fl-and-white bars in a pair of the normally unseen vertical interval lines in a television 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.
		This internal redundancy is exploited by VITC readers, in addition to the standard timecode "flywheel" algorithm.
	www.yourencyclopedia.net /VITC.html (209 words)

	SMPTE time code (Site not responding. Last check: 2007-10-21)
		Timecodes are added to film, video or audio material, and have also been adapted to synchronize music.
		As timecodes in analog systems are prone to bit-errors and drop-outs, most timecode processing devices check for internal consistency in the sequence of timecode values, and use simple error correction schemes to correct for short error bursts.
		This meant that an "hour of timecode" at a nominal frame rate of 30 frame/s was shorter than an hour of wall-clock time by 3.59 seconds, leading to an error of almost a minute and a half over a day.
	www.sciencedaily.com /encyclopedia/smpte_time_code (1229 words)

	Burnt-in timecode - Wikipedia, the free encyclopedia
		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.
		BITC is sometimes used in conjunction with "real" machine-readable timecode, but more often used in copies of original material on to a non-broadcast format such as VHS, so that the VHS copies can be traced back to their master tape and the original time codes easily located.
		Videotapes that are recorded with timecode numbers overlaid on the video are referred to as window dubs, named after the "window" that displays the burnt-in timecode on-screen.
	en.wikipedia.org /wiki/Burnt-in_timecode (281 words)

	SMPTE time code : SMPTE timecode (Site not responding. Last check: 2007-10-21)
		In general, SMPTE timecode frame rate information is implicit, known from the rate of arrival of the timecode from the medium, or other metadata encoded in the medium.
		This meant that an "hour of timecode" at a nominal frame rate of 30 fps was shorter than an hour of wall-clock time by 3.59 seconds, leading to an error of almost a minute and a half over a day.
		To correct this, drop frame SMPTE timecode drops frame numbers 0 and 1 of the first second of every minute, and includes them when the number of minutes is divisible by ten.
	www.city-search.org /sm/smpte-timecode.html (1205 words)

	SMPTE Timecode in the DTV Era
		Timecode used in television – i.e., 30, 29.97 and 25 fps – may be one of two varieties: linear timecode or, as it was formerly known, longitudinal timecode (LTC) and vertical interval timecode (VITC).
		This type of timecode may be recorded on analog audio tracks and was called longitudinal timecode because it was recorded on the longitudinal or linear (as opposed to FM or some other technology) audio tracks of video tape recorders.
		Timecode is fundamentally a way to label frames to keep track of them and either drop or nondrop timecode will uniquely identify each frame.
	www.tvtech.com /features/Tech-Corner/f-rh-smp.shtml (1270 words)

	Technical Introduction to Timecode
		Timecode systems assign a number to each frame of video analogously to the way that film is manufactured with edge numbers to allow each frame to be uniquely identified.
		Timecode is recorded on studio videotape and audiotape recorders as a longitudinal track with characteristics similar or identical to those of an audio track.
		Vertical Interval timecode overcomes the disadvantage that LTC cannot be read with videotape stopped or moving slowly.
	www.poynton.com /notes/video/Timecode (1524 words)

	Timelord Master Timecode Generator
		The data repetition rate may be set to regularly transmit at intervals of one second, one minute, five minutes, one hour or 24 hours, or on request from the synchronized device.
		Unless the station SPG happens to be producing the correct frame of video at that time and that the vertical interval happens to line up with the sync word the timecode outut has limited use for video applications.
		Even with an externally-locked oscillator, however, the relationship between the vertical interval and timecode is unlikely to be correct and a discontinuity will still occur if there happens to be "leap second" which introduces a 1-second jump in time which does not correspond to a whole number of video frames.
	www.vtx.co.uk /time/timelord.htm (1443 words)

	Timecode Processing with Microvideo (Site not responding. Last check: 2007-10-21)
		Timecode is one of the many vertical interval signals that is handled by Microvideo inserters.
		In digital systems the timecode needs to be inserted in the vertical interval of an SDV signal and the VITC waveform is then generated digitally.
		Often other vertical interval signals, such as wide screen signalling or VBI data from an analogue source, may need to be inserted in the same feed.
	www.microvideo.co.uk /tcprod.htm (250 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Timecode stored in the video track of a video source, in the vertical interval between frames: thus the name “vertical interval timecode.” Using VITC timecode leaves both audio tracks free for audio signals and so allows stereo audio recording plus timecode recording to be performed.
		Interval sampling Interval sampling involves determining a regular interval for sampling events, and then deciding what the most typical event is of the whole interval.
		Interval sampling needs to be supported by tools that help the Sampling Filter determine whether an event is a sufficiently strong representative of interval to represent it in the event sequence.
	www.itee.uq.edu.au /cerg/MacSHAPA/MacSHAPA_Manual_SSB_v1.doc (19880 words)

	[No title]
		SMPTE timecode is the standard timecode format used on all non-digital media, such at Beta and SVHS.
		Timecode counts at 30 frames per second, but NTSC video is actually runs at 29.97.
		Pre-Rolling Timecode Whenever you are recording using timecode, five to ten seconds of timecode should be recorded before you begin recording the desired material onto the tape.
	www.itg.uiuc.edu /help/avdoc/timecode/timecodeFormats.doc (1048 words)

	SMPTE EBU timecode by Phil Rees
		In music technology applications, with equipment which is not timecode compatible, you may be able to use a tape sync unit by way of a tempo-relative stripe system.
		At the same time, not all VTRs were equipped with timecode boards, and not all of those that did performed a regeneration of the off-tape timecode (which provides a properly phased and shaped signal to the outside world).
		In timecode, the pattern is not broken by the Dropped Frames (as these come in pairs) nor by the resetting of the frame count when the seconds count is incremented (there are always an even number of frames in each second).
	www.philrees.co.uk /articles/timecode.htm (4968 words)

	Vicon Peak \| MX Control
		MX Control can both lock to another timecode source, behaving as a slave, or if you don’t have another source it can generate its own master, which can be fed to other devices.
		TIMECODE BURN-IN MX Control enables you to burn either a full timecode or a frame count into a video feed for reference purposes or shot visualization.
		In production this is useful where you need to trigger the start of capture at a specific timecode; for example when you have a pre-recorded audio sequence or video slate you want your motions to match.
	www.peakperform.com /products/mxcontrol.html (745 words)

	Radiophonic Workshop: 9. Vertical Interval
		They had proposed the use of Vertical Interval Timecode (VITC), a mechanism whereby timecode was embedded in unused ‘lines’ of information outside the normal area of the television picture.
		Timecode was now only available when the tape was running at normal speed: when the tape was ‘inched’ forwards or backwards nothing was produced.
		In terms of normal timecode, this was similar to spooling a conventional tape against a machine’s heads at high speed.
	www.glias.org.uk /glias/rws/pgs/r09.htm (1785 words)

	Calprod Pro Film/Video Production Inc.
		Timecode numbers that are superimposed on the picture, used for logging and selecting material.
		When timecode was first developed it was assumed that video would run at exactly 30 frames per second.
		Vertical Interval Timecode is recorded within the video picture, during the vertical blanking interval.
	www.profilmvideo.com /glossary.html (6575 words)

	Articles - SMPTE time code (Site not responding. Last check: 2007-10-21)
		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.
		The invention of timecode made modern videotape editing possible, and led eventually to the creation of non-linear editing systems.
		Vertical interval timecode (VITC, pronounced "vitsee") recorded directly into the VBI (vertical blanking interval) of the video signal on each frame of video.
	www.lastring.com /articles/SMPTE_time_code?mySession=cedbe414858e116207289ade5f5151c5 (1276 words)

	About Timecode
		If dealing with a miniDV or DVCAM tape with 'broken' Timecode (that is in many parts), either do a clone copy to another DV tape so that the Timecode is created continuously for the entire tape, or name each Timecode section as a different tape.
		In Media 100 the Timecode type is indicated by a ';' in the 'fields' separator for Drop frame, and a ':' for non-Drop frame.
		Time of Day, or Free Run, Timecode runs continuously and what is written to the tape is the 'time of day' or whatever point the Free Run Timecode has counted to when recording is started.
	www.creativecow.net /articles/hodgetts_philip/multi_camera/AboutTimecode.htm (663 words)

	Aaton and KeyKode
		By choosing to record a true time and date on the camera negative(s) and field audio during production, rather than just a non-time related SMPTE timecode, we are ensuring that a unique and non-repeatable address lives on the image and sound originals forever.
		Timecode is input into the camera by jam-syncing from any standard SMPTE sound recorder, or more effectively, with the use of the OriginCplus masterclock.
		Keylink also functions as a multi window and Virtual Slate inserter, a standard and 3-line VITC (vertical interval timecode) inserter in both the analog and digital domains, as well as a comprehensive information manager.
	www.wrslabs.com /aaton.html (1438 words)

	Timecode
		These timecodes are often used as markers so that edited or processed material can be later correlated with material edited or processed on another machine.
		When a deck reports its current position (its current timecode) to its controller or responds to a command to edit-in or edit-out at a certain position (timecode), it needs a reliable way to determine just where that tape position is. Decks use on-tape timecode signals for this.
		This on-tape timecode signal often mimics an over-the-wire timecode signal, as is the case for LTC.
	www.lurkertech.com /lg/timecode.html (1731 words)

	Technical Background - Timcode (Site not responding. Last check: 2007-10-21)
		It is a method by which the timecode word is written as additional data during the vertical interval of a video signal.
		The timecode signal from an audio recorder not only stops counting but is no longer present once the tape machine stops.
		The effect of this is for a simple reader not to realise the VTR has stopped because it continues to get timecode frames which it assumes are continuing to increase.
	www.amek.com /oldsite/datashee/timecode.htm (1189 words)

	Linear timecode : LTC
		A special bit in the linear timecode frame, the 'biphase mark correction' bit, ensures that there are an even number of AC transitions in each timecode frame.
		The sound of linear timecode is a jarring and distinctive noise and has been used as a sound-effects shorthand to imply 'telemetry' or 'computers'.
		Care has to be taken with analog audio to avoid audible 'breakthrough' from the LTC track to the audio tracks.
	www.fastload.org /lt/LTC.html (144 words)

	SMPTE timecode 80-bit data format (Site not responding. Last check: 2007-10-21)
		SMPTE timecode is based on a bit rate of 2400 bits per second, which provides a data format of 80 bits per frame (in a 30-frame per second system).
		Longitudinal Timecode (called LTC) is recorded on an audio track.
		Vertical Interval Timecode (called VITC) is recorded into the vertical synch period of the video frame signal.
	www.bnoack.com /data/SMPTE-format.html (87 words)

	AMIO - LTC vs VITC (Site not responding. Last check: 2007-10-21)
		There are two varieties of timecode used in television.
		- Formats such as D2 or Betacam SP have an address track devoted exclusively to Timecode onto which LTC is recorded.
		- Vertical interval timecode is a digital signal recorded onto the vertical blanking interval of the video signal.
	www.amio.ca /site/article_ltcvsvitc.html (229 words)

	MIDI timecode - Wikipedia, the free encyclopedia
		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.
		The quarter-frame messages are transmitted in a sequence of eight messages, thus a complete timecode value is specified every two frames.
		Unlike standard SMPTE timecode, the eight-message MIDI timecode sequence carries a two-bit flag value that identifies the rate of the timecode, specifiying it as either:
	www.wikipedia.org /wiki/MIDI_timecode (126 words)

	[No title]
		A timecode is assigned to each individual frame which is then recorded together with the video picture.
		During recording, the VITC is written into one or more of the unused lines at the start of each individual full picture (blanking interval).
		During normal operation, the VITC is stored on the videotape as a non-visible part of the picture signal.
	www.studio-systems.com /gloss/MarApr2001/57.htm (705 words)

	ENLIGHTENMENT: Basics - Protocols (Site not responding. Last check: 2007-10-21)
		Timecode is the general name given to sending time information between equipment so that they can synchronise together.
		Longitudinal TimeCode can be recorded on audio tape or CD, or transmitted as an audio signal.
		MIDI TimeCode operates at any one of the frame rates above and is transmitted over a MIDI cable.
	www.enlightenment.co.uk /frames/basic/w-dmxetc.htm (1221 words)

	[No title]
		All I need is horizontal SMPTE and the ability to record timecode and (perhaps) audio without affecting the picture.
		Be sure the videotape has timecode on an audio track and not only the visual window.
		vertical interval timecode - VITC is in the vertical interval of the video signal---- no good for this, you need timecode recorded as an audio signal either on an audio channel or on a timecode track.
	www.ibiblio.org /emusic-l/back-issues/vol041/issue05.txt (1269 words)

	Play's Pocket Producer at HD Vision and Verizon
		Drop frame timecode drops the first two frames of the timecode count at the beginning of each minute except for every tenth minute.
		Also, many editing systems use vertical interval timecode (VITC), and a note about making sure that the LTC and VITC are set to record the same timecode should be included in the manual.
		You have to know what kind of timecode - drop frame or non drop frame - is on the video tapes you are logging when you use Pocket Producer and adjust it accordingly so that what you log is accurate.
	broadcastengineering.com /mag/broadcasting_plays_pocket_producer (1183 words)

	Articles - Waveform monitor (Site not responding. Last check: 2007-10-21)
		It can also be used to visualize and observe special signals in the vertical blanking interval of a video signal, as well as the colorburst between each line of video.
		Originally, waveform monitors were entirely analog devices; the incoming (analog) video signal was filtered and amplified, and the resulting voltage was used to drive the vertical axis of a cathode ray tube.
		A sync stripper circuit was used to isolate the sync pulses and colorburst from the video signal; the recovered sync information was fed to a sweep circuit which drove the horizontal axis.
	www.ezorange.com /articles/Waveform_monitor (536 words)

	eyeheight news
		The BBC has ordered 26 of Eyeheight’s new BT-1 burnt-in timecode generators for installation in the Television News area at White City, London.
		The order came via systems engineering company ATG Spectrum (UK) Ltd. The generators read vertical-interval timecode (VITC) from an SDI signal and overlay hours/minutes/seconds/field over the viewed image in any of four different display modes with user-selectable screenposition/size and user-selectable character colour and background colour.
		I-Bus has the capacity to communicate with 192 devices via RS-422 at up to 100 kbit/s data rate and is being used by an increasing number of broadcast equipment manufacturers as a highly cost-effective control architecture.
	www.eyeheight.com /news_window.asp?file=20000217.txt (181 words)

	Timecode
		It can read LTC Longitudinal Timecode, Generate VITC Vertical Interval Timecode either from a preset time or jam-synched to the LTC timecode input plus generate timecode characters in vision for window dubs, used for tape logging.
		It provides a large, clear readout of timecode from the camera at distances of up to 100 metres, without cables - and without having to ask the cameraman "what's the code?" A small battery-powered transmitter is attached to the camera and fed with LTC timecode in EBU or SMPTE, dropframe or non-dropframe format.
		Sync information is derived from the input video signal and fed to both decoders, and reference pulses are derived from each of the decoders and compared to give the relevant indications.
	www.vtx.co.uk /time/timecode.htm (845 words)

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