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» FAQ » General
Video signals and standard VGA (PC)
VIDEO
Projectors usually support every Video signal: NTSC, American standard, PAL, European standard and SECAM used in centre and South America and France.
PAL
Composite video signal. Its the European, France excluded, signal. This acronym stands for Phase Alternating Line.
SECAM
Composite video signal. It is used in France as well as in Eastern Europe. The acronym stands for Sequential Couleur A Memorie.
PROGRESSIVE SCAN
Before we get into the nature of progressive scan, it is important to understand the way traditional television images are displayed on a television screen. Analog television signals, such as those from your local TV station, or VCR are displayed on a television screen using a technology known as Interlaced Scan.
Progressive scan differs from interlaced scan in that the image is displayed on a screen by scanning each line (or row of pixels) in a sequential order rather than an alternate order, as is done with interlaced scan. In other words, in progressive scan, the image lines (or pixel rows) are scanned in numerical order (1,2,3) down the screen from top to bottom, instead of in an alternate order (lines or rows 1,3,5, etc... followed by lines or rows 2,4,6). By progressively scanning the image onto a screen every 60th of a second rather than "interlacing" alternate lines every 30th of a second, a smoother, more detailed, image can be produced on the screen that is perfectly suited for viewing fine details, such as text, and is also less susceptible to interlace flicker.
VGA SIGNALS
Projectors usually support any kind of VGA signal. The most popular are SVGA , XGA and SXGA.
Native SVGA projectors usually support resolution from VGA to XGA.
Native XGA projectors usually support resolution from VGA to SXGA.
Others may support from VGA to UXGA signals.
S-VIDEO or S-VHS
S-video (separated video) or Y/C, wrongly called S-VHS, bears the two signals Y and C separated, in such a way as it strongly improves composite signal. Thi signal always keeps a medium-high quality.
COMPOSITE SIGNAL
Composite signal, also called CVBS (Composite Video Baseband Signal or Composite Video Blanking and Sync), it's a standard signal, accepted by quite every video media. It's an analog signal, with the worst quality among those available now.
COMPONENT (YCbCr, YPbPr, YUV)
After RGB, Component signal is one of the best vide signals available.
It can refer both to an analog and to a digital signal.It's mostly used in the professional environment, and it is usually referred to as YCbCr, digital, or YPbPr, analog.
RGB (RGBs, RGBHV)
RGB signal is a separated component signals, both analog or digital. Image is transmitted trough the three main colors:
red, green,blue. It is required to use from three to five different cables.
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