Pioneer PDA-4001, Technical Manual

Page: 133 / 136

133
<Ver. 2.1>
Mask approxi-
mately 10 lines at
both top and
bottom (black or
gray).
NTSC MASK NTSC MASK
Images are
displayed on the
entire screen
(480 lines).
BLACK
or
GRAY
OFF
Mask color select/off when NTSC is input
6.2 Mask color select/off when NTSC is input
6.2.1 Functions
This function selects black or gray mask (MASK GRAY/BLACK) processing for approximately 10 lines at the top or
bottom of the screen, or reproduction of images (MASK OFF) for the whole screen (480 lines).
This function is factory-set to MASK ON (black) state.
6.2.2 Setting method
The mask can be set by an RS232C command or in integrator mode.
• Setting by RS232C commands
Activate the RS232C adjusting mode, and then:
Sending the <NMG> command will set the gray mask.
Sending the <NMB> command will set the black mask.
Sending the <NMN> command will turn off the mask.
For setting in integrator mode, see page 123.
6.2.3 Precautions
• If masked display is used for extended periods, the unmasked and masked areas of the display may begin to exhibit
slightly different display characteristics, as a result of varying rates of phosphor deterioration.
For example, on a masked display receiving NTSC signals that rarely displays a full-screen 480 lines, the top and
bottom masked sections will experience no phosphor deterioration, resulting in possible differences in luminance
and white-balance from the image area.
• Depending on the input source, the display may exhibit some anomalies when the mask is removed, such as a
wavering display at the top on the screen.
+
Mask
+
Mask