Multimedia is a term typically used to mean the combination of text, sound, and/or motion video. Multimedia has been described as the addition of animated images, but typically it means one of the following:
Text and sound
Text, sound, and still or animated graphic images
Text, sound, and video images
Video and sound
Multiple display areas, images, or presentations presented concurrently
In live situations, the use of a speaker or actors and "props" together with sound, images, and motion video
A video adapter (also called a display adapter or video board) is an integrated circuit card in a computer that provides digital-to-analog conversion, video RAM, and a video controller so that data can be sent to a computer's display. In a few cases, the video adapter is built in to the monitor. Today, almost all displays and video adapters adhere to the standard Video Graphics Array (VGA).
Display Characteristics Dot pitch is a diagonal distance between the same color phosphor dots. The smaller the dot pitch, the greater the potential image sharpness. The three primary colors used in monitor displays are red, green, and blue (RGB)
On desktop computers, the display screen width relative to height, known as the aspect ratio , is generally standardized at 4 to 3 (usually indicated as "4:3").
Screen sizes are measured in either millimeters or inches diagonally from one corner to the opposite corner. Common desktop screen sizes are 15, 17, and 19-inch. Notebook screen sizes are somewhat smaller.
Two data-compression standards are commonly used with digitized video. These are the Joint Photographic Experts Group (JPEG) and the Moving Picture Experts Group (MPEG) compression standards.
Other Compression Standards
Indeo compression standard, developed by Intel.
Another compression/decompression (codec) standard supported by Video for Windows is Cinepak . This standard uses an AVI file format to produce 40:1 compression ratios and 30-frames per second capture, at 320-by-200 resolution.
JPEG provides enough compression to allow single-frame digitized images to fit on disk drives, but full-motion pictures were going to need much greater compression to be useful on current technology. Therefore, the MPEG format was developed.
MPEG has compression ratios up to 200:1, with high-quality video and audio.
After the video card has been installed and the monitor has been connected to the video card and plugged into the power outlet, it will be necessary to install the correct drivers for the video card. The Windows 9x operating systems should detect the video card, start the system with basic VGA video drivers, and ask you if you want to install the manufacturer's video drivers.
The Windows 2000 operating system is even more proactive. It will detect the new video card, tell you that it has found the new card, and then automatically load its video drivers. The only time that you should need to be directly involved with the system's video drivers is when PnP fails or the video card is not recognized by the operating system.
Monitors are analog, not digital devices. In order for the monitor to work, the digital information in the video memory must be translated into analog form for export to the monitor screen. This is the role of the Random Access Memory Digital-to-Analog Converter (RAMDAC) chip. The RAMDAC chip reads the video memory contents, converts it to analog, and sends it over a cable to the video monitor. The quality of this chip impacts the quality of the image, speed of the refresh rate, and maximum resolution capability. Refresh rate refers to the number of times per second that the video display screen can be redrawn.
The video chip set relies on video memory to render the image requested. The basic element of every video image is a dot (or pixel). Many dots comprise what you see displayed on the monitor. Every dot has a location reserved in video memory. The maximum number of dots, which can be displayed, relates to the resolution.
Resolution is expressed as a pair of numbers. Each pair of numbers represents the maximum possible number of dots on a horizontal and vertical axis. The basic VGA resolution is 640 by 480. The higher the resolution, the sharper and clearer the image.
There are four different methods of DVD recording.
DVD-R is similar to CD-R technology in that it allows the media to be written one time only. This method is most often used for DVD authoring and is not very practical for consumers due to the price of drives
DVD-RAM – Using the RAM technology allows users to write and overwrite discs 100,000 times. DVD-RAM uses phase-change technology similar to CD-RW drives and stores 4.7 GB of information on each side of the disc.
The DVD-RW is a technology designed to address compatibility and re-recording issues. Geared more towards general use than authoring
DVD+RW is the latest DVD recording technology. As with DVD-RW, the technology is both compatible with existing hardware and is easily written to multiple times. The major advantage of DVD+RW is the ability to use a variable bit-rate when encoding certain types of media, such as streaming video.
Standard VHS – Uses the same type of video tapes as a regular VCR.
VHS-C – This is a compact VHS format.
Super VHS – Super VHS tape records an image with a much higher resolution image than standard VHS tape. The video camera itself is a VCR and can be hooked up directly to a television or VCR to copy to standard VHS tapes.
Super VHS-C – A more compact version of Super VHS that uses a smaller size cassette.
8mm – Small 8mm tapes, about the size of an audio cassette, are used and provide about the same resolution as standard VHS.
Hi-8 –Hi-8 camcorders have a higher resolution. Hi-8 tapes are more expensive than ordinary 8mm tapes.