DocID009413 Rev 10

19/27

TSH80, TSH82

Test conditions

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4.2

Video capabilities

To characterize the differential phase and differential gain, a CCIR330 video line is used.

The video line contains of five (flat) levels of luminance onto which the chrominance signal

is superimposed. The luminance gives various amplitudes which define the saturation of the

signal. The chrominance gives various phases which define the color of the signal.

Differential phase (or differential gain) distortion is present if a signal chrominance phase

(gain) is affected by the luminance level. The differential phase and gain represent the

ability to uniformly process the high frequency information at all luminance levels.

When a differential gain is present, color saturation is not correctly reproduced.

The input generator is the Rohde & Schwarz CCVS. The output measurement is made by

the Rohde and Schwarz VSA.

Figure 33. Measurement on Rohde and Schwarz VSA