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AppendixA-16
A
Sawtooth waveform
A form of signal resembling the teeth of a saw. A video signal having a
sawtooth waveform is used to check linearity and other characteristics of
video amplifiers.
Shot data
Data recorded, while shooting, in the color bars, the U-BIT data of the
VITC, and so forth. Includes the model name, serial number, date, time,
shot number, cassette number, and ID1 to ID4.
Shutter speed
The length of time for which the shutter stays open. The higher the
shutter speed, the more clearly a moving object can be shot.
Smear
See Vertical smear.
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.
S/N
Signal-to-Noise ratio. The relation of the strength of the desired signal to
the accompanying electronic interference, the noise. If S/N is high,
sounds are reproduced with less noise and pictures are reproduced
clearly without snow.
Time code
A digitally encoded signal which is recorded on video tape to identify
each frame of video by hour, minute, second and frame number. SMPTE
time code is applied to NTSC system, and EBU time code to PAL and
SECAM systems. There are two kinds of recorded signals : longitudinal
time code (LTC) and vertical interval time code (VITC). See also LTC
and VITC.