TV One C2-7000 Series, Руководство пользователя

Страница: 62 / 120

C2-7000 S
ERIES
O
PERATION
M
ANUAL
56
The H freq.crse (Horizontal Sync Frequency - Course) adjustment provides
the option for changing the Horizontal Sync timing Frequency in 100 Hz steps.
Fine Frequency Adjust
The H.freq.fine (Horizontal Sync Frequency) adjustment provides the option
for changing the Horizontal Sync timing Frequency in 1 Hz steps. Use this
option to fine tune after using the course adjust.
Please note that the internal sync generator may be unable to generate the
exact frequency you want.
This option changes the total number of image pixels on one line of monitor
video including the Horizontal sync pulse and blanking time. This is normally
in a multiple of 8. It is very important to get this value correct, or many digital
display devices, such as TFT monitors, will display an image with an odd
moiré effect – such as soft vertical bands spread evenly across the image.
This menu controls the total number of lines of video present in the image
which includes the vertical Sync pulse, the blanking period and the active
video. Changing this option affects the final vertical sync frequency.
A video frame includes both the active area, the portion of the image normally
containing useful visual information, and a resolution value for a given display
standard which only expresses the number of pixels visible in an image.
The well-known 800 x 600 computer resolution standard simply means that
there are 800 pixels/line visible horizontally and there are 600 lines visible
vertically.
This item provides a way to change the number of active pixels and lines.
There is a period of time between the end of the Horizontal Sync pulse and
the start of Active Video. This portion of the waveform signal is called the
“Back Porch”, a term originating with the television broadcasting industry and
its RS-170A specification. In practice, this will control where the video image
800 x 600 60 Hz
H.freq.fine [37.879] kHz
800 x 600 60 Hz
Clks/l [1056] = 40.000MHz
800 x 600 60 Hz
Lines/f [ 628] = 60.317 Hz
800 x 600 60 Hz
H/V active
[ 800] x 600
800 x 600 60 Hz
H/V Start [ 88] x 23