9.5

Table Of Contents
Synchronization
Timecode (positional references)
LTC (Longitudinal Timecode) is an analog signal that can be recorded on tape. It should
be used for positional information primarily. It can also be used for speed and phase
information as a last resort if no other clock source is available.
VITC (Vertical Interval Timecode) is contained within a composite video signal. It is
recorded onto video tape and is physically tied to each video frame.
MTC (MIDI Timecode) is identical to LTC except that it is a digital signal transmitted via
MIDI.
Timecode standards
Timecode has several standards. The subject of the various timecode formats can be very
confusing due to the use and misuse of the shorthand names for specific timecode standards
and frame rates. The timecode format can be divided into 2 variables: frame count and frame
rate.
Frame count (frames per second)
The frame count of timecode defines the standard with which it is labeled. There are 4 timecode
standards:
24 fps Film (F)
This frame count is the traditional count for film. It is also used for HD video formats
and commonly referred to as 24 p. However, with HD video, the actual frame rate or
speed of the video sync reference is slower, 23.976 frames per second, so timecode
does not reflect the actual realtime on the clock for 24p HD video.
25 fps PAL (P)
This is the broadcast video standard frame count for European (and other PAL
countries) television broadcast.
30 fps non-drop SMPTE (N)
This is the frame count of NTSC broadcast video. However, the actual frame rate
or speed of the video format runs at 29.97 fps. This timecode clock does not run in
realtime. It is slightly slower by 0.1 %.
30  fps drop-frame SMPTE (D)
The 30 fps drop-frame count is an adaptation that allows a timecode display running
at 29.97 fps to actually show the clock-on-the-wall-time of the timeline by dropping
or skipping specific frame numbers in order to catch the clock up to realtime.
Confused? Just remember to keep the timecode standard (or frame count) and frame rate (or
speed) separate.
Frame rate (speed)
Regardless of the frame counting system, the actual speed at which frames of video go by in real
time is the true frame rate.
Cubase supports the following frame rates:
24 fps
This is the true speed of standard film cameras.
25 fps
This is the frame rate of PAL video.
29.97 fps
This is the frame rate of NTSC video. The count can be either non-drop or drop-
frame.
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