Monday, March 12, 2012

Video Scaler Audio/Video Processors

A video scalar converts a video signal between arbitrary resolutions. It is mainly used to convert interlaced signals of low resolution, such as, composite video signals or s-video, into higher resolution non-interlaced, like the ones in HDTV. Composite video signals are those which carries all information - the red, blue, and green signals and sometimes audio as well. S-video (separate video) is an analogue video signal in which the video data is carried separately - brightness and colour. This is unlike the composite video signal. Interlacing is a technique, by which the picture quality is improved, without consuming any extra bandwidth. Interlaced signals have flickering effect while non-interlaced ones do not.

Video scalar Audio/Video Processors are available for analogue and digital inputs and outputs or, more commonly, both combined. As an example, a video scalar would convert an analogue VGA signal into digital signal for display on a monitor. In this case the resolution of the video signal may be of low quality, creating distorted image. A scalar can increase the resolution substantially to the correct level.

A video Scalar turns a standard television into a high definition TV (HDTV). The scalar lets you connect the standard definition enabled equipment, like, DVD player, video game, VCR, etc., to HDTV display devices, such as Plasma or LCD screen TVs. A video scalar can provide multiple refresh rate outputs. For example, with a converted PAL video signal at its input, a video scalar can display video on projectors that do not support 50Hz refresh rates.

DCDi is a video mode algorithm and has been designed for video displays featuring fast moving sports events. It removes the jagged edges along the diagonal lines, which are mainly caused by interpolation. DCDi monitors this edge transmission and fills in the gaps. This technology was developed and introduced few years back, and broadcasters like CBS used it to up-convert NTSC to High Definition (HD).

No matter at what resolution the picture is delivered, be it 480i from your VCR, 480p from your DVD player, 720p from your set-top box or 1080i over Digital Visual Interface (DVI) or High-Definition Multimedia Interface (HDMI), the video processor/scalier will perfectly match the output to the optimum resolution of your display. It is your complete audio video hub, providing simultaneous audio/video switching with automatic video.

DVDi technology as used in video processor/scalar is a series of mathematical formula (algorithm) meant for video. If you want to watch a film on your TV, you would wonder how this technology will behave under the circumstances. In making a video out of a film, if the transition from a film to video is not done properly, it results in 'bad editing'. The video processor within the video processor/scalar unit will switch modes, such as, film vs. video - video vs. film, in order to avoid artifacts. The processor switched from film to video as soon as it encounters these bad editing portions. This may result in loss of resolution, which is minimised by the video processor/scalar, being motion adaptive. Then there are those jagged areas along the diagonal edges. DCDi hides these areas in such a way that you never realise when it changes from and to film mode, Watching a movie with DCDi technology built-in video processor/scalar, makes the experience more enjoyable, owing to the fact that those annoying artifacts have all vanished, providing a continuous high definition picture viewing experience.