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May 22nd, 2018 04:00
720x576 resolution, pixel clock
Hi
Concerning this 2007 thread, for the 720x576, can you tell me the pixel clock? Also, can you tell me how many clocks is front porch, sync, and back porch for both horizontal and vertical? Also can you tell me the polarity of the sync signals? I am asking specifically regarding VGA input.
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DavidG1992
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May 22nd, 2018 08:00
I’ll explain
I am working with a video signal at 720x576 resolution on an FPGA. I have a VGA output on the FPGA, and I have to generate the timing signals, which are called front, back porch and sync
see this link and see a classic 640x480 specs
http://tinyvga.com/vga-timing
now, 720x576 isn’t a classic VGA resolution (as you can see, the spec is not listed in the link above), but the website said that most dell monitors can receive it, so I want to know all the specs and if it will work with my video
DELL-Chris M
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May 22nd, 2018 08:00
Apologies. I have no idea on how to ascertain the clock settings of a monitor port? I have also never heard of "porch" pertaining to a monitors specifications?
DELL-Chris M
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May 23rd, 2018 06:00
No idea. All you can is open each monitor User's Guide and check the validated resolutions.
speedstep
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June 6th, 2018 06:00
720x576 or 576p 25fps has a frame rate of 25 frames per second, and thus uses the same bandwidth and carries the same amount of pixel data as 576i; as such, 576p25 is considered to be standard definition
.It is used on analog PAL or SECAM systems.
Since All analog TV is now gone in the USA I would think that this is NOT SUPPORTED at all anymore. "576i"; in analog it is often called "625 lines" whereas NTSC analog is 525 lines.
576i when it is transmitted over free-to-air satellite signals is transmitted substantially differently from terrestrial transmission.
Full transponder mode (e.g., 72 MHz)
Luma signal is frequency-modulated (FM), but with a 50 Hz dithering signal to spread out energy over the transponder Chroma is phase-modulated (PM)
An FM subcarrier of 4.50, 5.50, 6.0, 6.50 or 6.65 MHz is added for mono sound
Other FM subcarriers (usually 7.02, 7.20, 7.38, 7.56, 7.74 and 7.92 MHz) are added for a true-stereo service and can also carry multi-lingual sound and radio services. These additional subcarriers are normally narrower bandwidth than the main mono subcarrier and are companded using Panda 1 or similar to preserve the signal-to-noise ratio.
Data subcarriers may also be added
Half-transponder mode (e.g., 36 MHz)
All of the above is done, but signal is bandwidth-limited to 18 MHz
The bandwidth limiting does not affect audio subcarriers