It can only accept signals at a frequency of Compared to a computer's signal frequency, which ranges from Less information is painted onto the screen, and that is why a TV does not produce those intense, crisp colors and images you get from a PC. Scan converters change the scan rate of a computer signal i.
Therefore, in order to view higher frequency video from a computer on a television, you must use a scan converter. Another reason why you cannot simply connect a PC to a TV is because they both receive signals differently. A computer outputs red, green, blue, and sync as separate signals.
This gives you the best picture quality because each signal is isolated. Televisions can only accept lower resolution signals such as RF, composite, S-video and component. Composite video is a composition of red, green, blue and horizontal and vertical sync as a single signal. The process of combining red, green, blue and sync information is called encoding. Therefore, a scan converter must encode the computer-video signal so that the television can accept it. When a signal is down-converted the resulting image will never look as good as the original.
It is inevitable that when you decrease image resolution, the result is a less than perfect picture. This is true with all scan converters or down converters. Typically, scan converters are used in applications such as computer-based training video production and videotaping, videoconferencing, distance learning, broadcasting or production. All of these applications require the conversion of high frequency computer-video to a signal that is compatible with VCRs, cameras, editing systems and other video related products.
The basic function of a scan converter is to convert the scan rate of computer-video and encode the signal so that it is compatible with NTSC or PAL-based components. There are, however, other functions of a scan converter that provide additional benefits. Autoscanning is a feature that allows a scan converter to accept any incoming computer signal within a given range.
A true autoscanning scan converter will recognize any incoming computer signal and lock on to its particular frequency and resolution. For example, a computer may be running at a scan rate of 70 kHz with resolutions ranging from x to x , and true autoscanning allows it to lock at any frequency within its range.
Horizontal filtering anti-aliasing enhances and stabilizes the final scan rate converted video image. As the original signal's frequency is slowed down, a loss of detail is inevitable. This is due to the reduction of picture elements, or pixels, that are visible on the screen. Less information is being painted onto the screen both horizontally and vertically.
Horizontal filtering prevents anti-aliasing or pixel elimination so that less detail is dropped when the television scans from left to right. Vertical filtering flicker filter also enhances and stabilizes the final scan rate converted video image.
Also known as a flicker filter, vertical filtering provides line averaging so that before the scan converter eliminates lines in the down conversion process it fills in missing information. By filling in averaged information, the scan converter helps to maintain vertical detail and eliminate picture flicker. Color sampling color depth represents how accurate the color reproduction of the scan converter will be. In order to match digital color to analog color, a scan converter must be able to provide a high degree of color reproduction.
In the process of color or color depth sampling, measurements of analog color level intensity are taken and then reproduced in the binary code that best represents the original analog video color. Extron's scan converters provide 8-bit sampling per color, or Encoding is the process of combining red, green, blue, and sync video information into one signal such as composite video. A high quality digital encoder will allow for this composition and still provide the clean, sharp transitions between colors.
Underscan and overscan are two ways to adjust the computer image's size on a television display. When you take a computer image to TV, the image will oversize off the screen horizontally and vertically. This can pose a problem especially when vital information has sized off the screen. Underscan resizes, or shrinks, the image both horizontally and vertically, maintaining the correct aspect ratio.
Overscan is just the opposite and allows you to increase the size of the image on the display screen while still maintaining the proper aspect ratio. Zoom refers to closing in on an image and enlarging a particular detail or decreasing the overall size of the image. Zoom also refers to "stepping back" from the image, as in "zoom out.
Centering is just what it sounds like; this feature allows you to horizontally and vertically center the image on the display screen. Memory is a valuable feature on a scan converter.
With a memory preset you can make adjustments to the image from a particular computer, and these settings will be stored in the scan converter's memory. When you reconnect the computer the scan converter will recognize it and pull up the saved settings from memory.
Extron's scan converters provide at least ten memory presets that save automatically so you don't have to remember to save each time. Genlocking is a necessary feature for broadcast or production environments.
Genlocking is the process of synchronizing all video devices for the purpose of pixel switching and chroma keying of computer overlays. A specific type of genlocking, known as chroma lock, refers to the synchronization of the sync signals and chroma. This allows the signals to be edited and composed to make a complete segment without any kind of distortion, glitch or signal irregularity.
RS control allows for control systems to control several components in a system without having to use the front panel buttons. Extron's scan converters are often integrated into a system environment, whether it is a broadcast and production setting or a professional corporate boardroom setting. When integrated, it is more convenient for the user to control the system via one control system.
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