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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
This distortion is also called differential luminance and is present if luminance gain is affected by luminance levels.
This amplitude distortion is a result of the system’s inability to uniformly process luminance information over the entire amplitude range.
The amount of luminance nonlinearity distortion is expressed as a percentage.
Measurements are made by comparing the amplitudes of the individual steps in a staircase signal as shown. The result is the difference between the largest and smallest steps, expressed as a percentage of the largest step. Measurements should be made at both high and low APL and the worst error should be quoted. In black and white pictures, luminance nonlinearity will cause pictures loss of detail in shadows and highlights which are caused by the crushing or clipping of the white or black portions of the signal. In colour pictures, luminance nonlinearity will cause colours in the high luminance portions of the picture to be distorted.
Industry:Software
A table that allows for the determination of Chrominance to Luminance Gain and Delay errors. Refer to the discussion on Chrominance to Luminance Gain and Delay.
Industry:Software
A) Noise which results from the agitation of the oxide molecules through the recording process. The modulation noise level increases as record level increases and disappears when no signal is present. b) The noise arising when reproducing a tape which has been recorded with a given signal, and which is a function of the instantaneous amplitude of the signal. This is related to DC noise and arises from the same causes.
Industry:Software
In a CAV system, this refers to the overall amplitude of all three signals that make up the CAV signal and is measured as the peak-to-peak voltages of the three video signals (usually including sync on luminance levels).
Industry:Software
The range in measured luminance between the lightest and the darkest element of a luminous scene or its display.
Industry:Software
The process of combining two video signals such that the resultant video signal is instant-by-instant the same as the brighter of the two weighted input signals. For example, at 50% fader, the brighter of the two videos predominates. The net effect of this type of mix is a superimposed appearance, with the picture balance controlled by the fader.
Industry:Software
The actual channels or speakers delivering discrete surround programme material.
Industry:Software
A) A section within a VTR that changes the frequency of the video signal information coming in from an external source (i.e., an electronic camera) to signal information that is compatible with the requirements of the VTR heads, while keeping the picture information basically unchanged. b) Pattern system electronics capable of distorting the edge of a pattern by impressing a sine or other waveform on the vertical or horizontal shape of the pattern. c) The device that places information on an RF carrier signal.
Industry:Software
The luminance range that can be displayed on a CRT is the ratio of maximum to minimum luminance on the tube face. The maximum practical output is determined by beam current, phosphor efficiency, shadow-mask distortion, etc. The minimum is the luminance of that portion of the tube face being scanned with beam current set to cut-off. The contributions from room illumination, external and internal reflections, etc., must be recognized.
Industry:Software
