is the measure of change in an oscillating variable.
In video specifically, “peak-to-peak”
amplitude is most commonly used. It is the measure, expressed in
Volts or IRE of the difference between lowest and highest voltages over
time. Peak-to-peak amplitudes can be measured by viewing the video
waveform on an oscilloscope or waveform monitor where voltage is
displayed along a vertical “Y” axis, as it changes over
time represented along the horizontal “X” axis. The peak
negative and positive values of the waveform are easily identified
and measured against a graticule. The difference between these peaks
is peak-to-peak amplitude.
For RS-170, NTSC, CCIR, and PAL analog
composite video, peak-to-peak, amplitude is commonly specified as 1
Vp-p. This is a nominal specification only and should not be taken
to mean that amplitude is always 1 Vp-p. Many cameras exceed 1Vp-p
for representing bright pictures. Dark pictures may hover around 0.5
Vp-p or less. Equipment that superimposes lines, circles, and
other patterns onto video may require the signal to exceed 1 Vp-p.
Video False Colorizer & Video Color Synthesizer
IRE, defined in terms of video