| A | B |
|---|
| the output of the sound card requires additional amplification if | external speakers are used. |
| Power for external speakers is derived from | batteries housed in the speaker cabinets or from a small AC power converter. |
| Most sound cards do have the capability of directly driving | low-power headphones. |
| data-compression standards commonly used with digitized video | Joint Photographic Experts Group (JPEG) and the Moving Picture Experts Group (MPEG) |
| compression/decompression standard that uses an AVI file format to produce 40:1 compression ratios and 30-frames per second capture, at 320-by-200 resolution | Cinepak |
| a compression algorithm that delivers compression ratios up to 200:1, with high-quality video and audio & compresses only key objects within a frame every 15th frame | MPEG |
| the MPEG compression scheme removes redundant information from | consecutive scenes |
| supports a quality that is very similar to CD-quality stereo output, at data rates between 128kbps and 256kbps | MPEG1 |
| specification that supports CD-quality surround-sound (four-channel) output. | MPEG 2 |
| Pentium systems include an advanced | Accelerated Graphics Port (AGP) interface for video graphics. |
| The AGP interface is a variation of the PCI bus design that | has been modified to handle the intense data throughput associated with 3-dimensional graphics |
| The AGP specification was introduced by Intel to provide a | 32-bit video channel that runs at 66 MHz in basic 1X video mode |
| The AGP standard provides for a direct channel between the | AGP graphic controller and the computer system main memory, instead of using the expansion buses for video data |
| The speed provided by the AGP link permits video data to be | stored in system RAM instead of in special video memory. |
| Video capture software is used to capture | frames of television video and convert them into digital formats |
| One of the jobs of the video capture card is to convert the | YUV format into an RGB VGA-compatible signal |
| the capture card scales the | image to fit in the defined video window on the monitor screen |
| To make digitized video manageable and useful to the digital computer system, the signal must be | compressed into smaller file |
| The only time that the user needs to be directly involved with the system video drivers is when | PnP fails or the video card is not recognized by the operating system |
| the role of the Random Access Memory Digital-to-Analog Converter (RAMDAC) chip | the digital information in the video memory must be translated into analog form for export to the monitor screen |
| The RAMDAC chip reads the . | video memory content, converts it to analog, and sends it over a cable to the video monitor |
| Refresh rate refers to the number of | times per second that the video display screen can be redrawn |
| The quality of the RAMDAC chip impacts the quality of the | image, speed of the refresh rate, and maximum resolution capability |
| Resolution is commonly expressed as a pair of numbers that represents the | maximum possible number of dots on a horizontal axis and the maximum possible number dots on a vertical axis. |
| The basic VGA resolution | 640 by 480 |
| Enhanced VGA has a resolution of | 800 by 600 dots. |
| the higher the resolution, the | sharper and clearer the image. |
| When an image is displayed in color (or grayscale), a certain number of bits must be assigned per dot (per pixel) to achieve | a given color depth or possible number of colors. |
| When the system CPU issues a series of commands to draw a box, it issues commands to the | video processor chip to draw the box. |
| How the image is to be displayed is the responsibility of the | video BIOS |
| The video BIOS provides the set of video functions that | can be used by the software programs to access the video hardware. |
| The video BIOS allows software to | interface with the video chipset in much the same way as the system BIOS does for the motherboard chipset. |
| When SVGA technology became an industry norm, incompatibilities in the different video BIOS implementations led to | the development of standardized BIOS |
