Sanyo VCC-XZ600P Instruction Manual page 94

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The line lock is a simple sync system that is used to synchronize each camera with the frequency of power

supply (60 Hz in North America and 50 Hz in Europe).

The line lock is in vertical-hold control of cameras selected with a switching device, such as a camera switcher,

and viewed on a single monitor screen.

For example, when the first camera (Camera 1) is connected through the camera switcher, the monitor screen

does not cause vertical image displacement. However, when the second camera (Camera 2) is connected and

selected, vertical image displacement may result. If that happens, the image of the second camera must

synchronize with that of the first camera.

Refer to "Power Source Synchronization (L-L)" for the adjustment method.

Gamma (γ) refers to the ratio of input or output voltage to image brightness. Whenever an image captured by a

camera is viewed on a monitor screen, the ratio should be as close as possible to 1 in order to reproduce the

image as natural as possible.

The luminosity of the monitor screen changes according to the strength of signal input from the camera. The

numerical value showing the level change of luminosity according to the strength change of signal input is called

gamma value.

The level of luminosity does not change in proportion to the strength of input signal. The changes of the level

and strength are expressed with a curve in a graph showing the strength change of signal input along the X-axis

and the level change of luminosity along the Y-axis. Moreover, the strength of signal input varies with the type of

monitor screen. In order to display the image as natural as possible, the gamma value needs adjustment. A

usual CRT monitor screen has a gamma value of 2.2. In this model, the contrast of the image is adjustable at

four different levels according to the change in luminosity of the image.

A usual CRT monitor screen has a gamma value of 2.2. If the gamma value of the camera is 0.45, the image will

look natural (i.e., 2.2 x 0.45 = 1).

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