Acoustic Echo Cancellation Enables you to decrease the echo you may hear while you are talking. Bandwidth The capacity to transmit data over a network such as the Internet. BMP Bit Map file. It is a Windows and OS/2 raster graphics file format. It is Windows' native bitmap format. Capture Rate The number of frames per second (fps) atwhich video is captured Codec Compressor/decompressor CPU Central processing unit DirectDraw DirectDraw provides a device-independent way for games and Windows subsystem software, such as 3-D graphics packages and digital video codecs, to gain access to the features of specific display devices. Direct Sound Low-latency mixing, hardware acceleration, and direct access to sound devices. It provides this functionality while maintaining compatibility with existing device drivers. Direct X A set of application programming interfaces (APIs) that provide resources enabling the design of high-performance, real-time applications. Firewall Firewalls are widely used to give users access to the Internet in a secure fashion as well as to separate a company's public Web server from its internal network. Full Duplex A mode of transmitting audio data (such as speech) in which data can be sent and received at the same time; in this way Full Duplex resembles the type of conversation you would have with someone in person or over a telephone. GIF Graphics Interchange Format. A popular raster graphics file format developed by CompuServe. It supports 8-bit color (256 colors) and is widely used on the Web, because the files compress well. Half Duplex Some sound cards only support Half Duplex. In Half Duplex audio data can travel in one direction at a time, therefore in a conversation using this type of card only one person at a time can speak and be heard. Intranet An inhouse Web site that serves the employees of the enterprise. Although intranet pages may link to the Internet, an intranet is not a site accessed by the general public. IP address Internet Protocol address. The physical address of a computer attached to a TCP/IP network. Every client and server station must have a unique IP address. Client workstations have either a permanent address or one that is dynamically assigned for each dial-up session (see DNS). IP addresses are written as four sets of numbers separated by periods; for example, 204.171.64.2. MMX MultiMedia Extensions. Enhancements to Intel's Pentium CPUs that allow software to perform fast multimedia (audio, video) operations that would otherwise require additional hardware. Overlay Overlay means your capture device displays video directly to your monitor without using any CPU resources. It gives you a clear picture in the Self View window, but may not reflect accurately what the other party sees, since transmission affects video quality. PCM Converter A software component that changes the characteristics and fidelity of raw, uncompressed digitized sound in exchange for an increase or decrease in necessary storage. Pixel An abbreviation for picture element; a way to measure picture resolution. RGB Red Green Blue. The color model used for generating video on a display screen. It displays colors as varying intensities of red, green and blue dots. Side Tone The half-volume sound you hear that reassures you that the sound you are transmitting is being heard by your remote party. A simple example of side tone is heard when you talk on your regular telephone. You can hear your own voice in your telephone's handset speaker. Video Display Options Video Display options usually allow users to define the appearance of captured video on screen. Video Format Options Video Format options usually allow users to adjust image size and format of the video. Video Source Options Video Source options usually allow users to adjust color functions such as brightness and contrast of the video. YUV The native signal format of video. When video is digitized and compressed, it is kept in YUV format, because it takes less storage than the RGB equivalent.