Appendix 7 Chapter
code. Using this mode produces a difference of approximately 86 seconds per day between real time and time code, which causes problems when editing programs in units of seconds using the number of frames as a reference.
NTSC
Abbreviation for National Television System Committee. NTSC is a color TV broadcasting system adopted mainly in North American countries, and in parts of Asia and Central and South America.
PAL
Abbreviation for Phase Alternating Line.PAL is a color TV broadcasting system developed by Telefunken GmbH of Germany. This system is adopted mainly in European countries, in Australia, and in parts of Asia and South America.
Progressive scan mode
A scanning method in which odd rows and even rows are read at the same time. Also called
Reference video signal
A video signal that contains a sync signal or sync and burst signals, used as a reference for synchronization of video equipment.
Return video
Video signals that are sent back from a VTR to a camera or from a control console to a camera so that a camera operator can verify the recorded/ selected video signals.
Sampling frequency
A method used to sample an analog signal so that it can be represented digitally. The higher the sampling frequency is, the more accurately the
SDI
Serial Digital Interface. An interface standardized as SMPTE 259M which enables the transmission of an uncompressed digital component stream.
Servo
A mechanism that controls the number and phase of revolutions of the head drum, capstan, or reel tables. The servo mechanism allows recording and playback of the video signal without guard band noise. The reference signal of the servo control is normally a vertical sync signal.
Shot data
Data recorded, while shooting, in the color bars, the user bits data of VITC, and so forth. Includes the model name, serial number, date, time, shot number, and ID1 to ID4.
Shutter speed
The time that the shutter is open. Slow shutter speeds give bright images, but motion resolution is lower.
SMPTE
Society of Motion Picture and Television Engineers, a professional association established in the U.S.A. mainly for the purpose of setting forth motion picture and television engineering standards.
A mode in which the head drum is stationary and the tape is slack. It means that the VTR is not ready for immediate recording or playback. It does not mean that the tape or video heads are damaged.
A mode in which the head drum rotates with the tape wrapped around it. It means that the VTR is ready for recording or playback. The VTR comes into
Superimpose
A procedure you use to put one picture (or character) over another so that both can be seen at the same time.
Time code
A digital signal recorded on the videotape that supplies information such as the hour, minute, second and frame number of each frame. There are two kinds of recorded signal:
longitudinal time code (LTC) and vertical interval time code (VITC).
Time code synchronization
To synchronize the
Time data
Time information that is generated by a time code generator or read by a time code reader.
User's bits
A
VBS
Abbreviation for
VITC
Abbreviation for vertical interval time code. A time code recorded on tape with video signals and inserted in the vertical blanking interval of video signals.The VTR can read this time code even in still mode.
White balance
The adjustment of red, green and blue signal levels so that white objects are reproduced as true white.
White shading
A phenomenon whereby the upper and lower portions of the white object that you are shooting appear magenta or green, while the central portion of the image appears white.
Zebra pattern
Striped patterns that appear in the viewfinder to indicate areas of the picture where the video level is about 70 IRE units or 490 mV.
Zoom
To gradually change the field of view of a camera lens from wide to narrow angle (zoom in) or narrow to wide angle (zoom out).
136 Glossary