Glossary
DS1000 Series User Manual
Glossary–3
Hum
The undesirable coupling of the 50 Hz (PAL) or 60 Hz (NTSC)
power sine wave into other electrical circuits.
Intercarrier Sound
A method used to recover audio information. Sound is separated
from video by beating the sound carrier against the video carrier,
producing a 4.5 MHz (NTSC) or 5.5 MHz (PAL) IF that contains
the sound information.
IRE
A unit equal to 1/140 of the peak-to-peak amplitude of the video
signal, which is typically one volt. The 0 IRE point is at the
blanking level, with the sync tip at –40 IRE and the white
extending to +100 IRE. IRE stands for Institute of Radio
Engineers, the organization that defined the unit.
Linear Distortion
Distortions that are independent of signal amplitude.
Luminance
The signal (Y) that represents brightness, or the amount of light in
the picture. This is the only signal required for black and white
pictures. For color systems, it is obtained as a weighted sum
(Y = 0.3R + 0.59G + 0.11B) of the R, G, and B signals.
Modulated
When referring to television test signals, this term implies that
chrominance information is present. (For example, a modulated
ramp has subcarrier on each step.)
Modulation
A process that moves information around in the frequency domain
in order to facilitate transmission or frequency-domain multiplex-
ing.
Non-Linear Distortion
Signal distortion that does not increase at the same rate as the
signal amplitude.
NTSC
National Television System Committee. The organization that
developed the television standard currently in use in the United
Summary of Contents for DS1001
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