Hall-research TVB-200PLUS Bedienungsanleitung PDF herunterladen (Seite 12)

Model TVB200-Plus

3. Operation

Upon plugging in the power, the unit performs a self-test and selects

the video input that was previously selected. If the unit was in “Auto”

mode prior to shut down, then it will come up in auto mode. To select

an input, simply press the push-button on the front of the unit

corresponding to that input. Corresponding LED indicates the selected

input.

Alternatively, the TVB200-Plus can be controlled by the serial RS232

port from any computer or RS-232 device (see details in following

section).

If the VGA input is selected, then the unit buffers the signal and passes

it to the output without modification. If the input is from one of the 3

NTSC or PAL channels, the unit automatically converts the signal to

VGA. The conversion is performed by line doubling and image

processing via digital filtering. The output signal preserves the entire

information contained in the TV input signal, and also improves the

way it appears on the screen by line doubling (de-interlaced). The

output resolution during conversion is 640x480 for NTSC Systems and

768x576 for PAL. Almost all VGA monitors and LCD's today should

automatically size the image to perfectly fit the screen.

Some VCR's (particularly lower cost ones with no time-base

correction), may not output accurate and clean video signal timing

Figure 2.2

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Hall-research TVB-200PLUS Bedienungsanleitung Seite 12