TV One C2-6204 handleiding
Handleiding
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34 tvONE
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
starts on the left side of the monitor without changing the width of the sync pulse itself (another way to
control where the image area starts). The two parameters control where the back porch is positioned and
they interact to a degree.
By adjusting these parameters, you control the start of the back porch (with respect to the trailing edge of
Horizontal Sync), and also its width. The place where the Back Porch begins with respect to the Horizontal
Sync pulse and the width of the Back Porch have a direct bearing on where the active (visible) portion of
the image begins. Do not attempt this adjustment without monitoring the results with an oscilloscope.
There are standards for all current computer and broadcast resolutions that specify the correct width of
both Vertical and Horizontal synchronizing pulses.
If you are creating a special, non-standard resolution, you may wish to adjust the pulse width to fit your
new requirements. The H/V Sync screen is where that is accomplished.
Like the H/V Start adjustment, you must use an oscilloscope when making these adjustments so that you
know exactly how many milliseconds or microseconds of pulse width you have created. The numbers
shown are relative numbers and not an actual time measurement.
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
800 x 600 60 Hz
H/V Sync [ 128] x 4
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Productinformatie
| Merk | TV One |
| Model | C2-6204 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 7375 MB |