Labels:text | screenshot | font | black and white | document | paper OCR: Note: terms followed by an asterisk (*) have individual articles. analog - nformation that is reproduced using a continuously varying electronic signal. h video terms, its opposite is digital. aspect ratio - The proportions of a TV or film picture, generally given as the ratio of width to height. The standard TV picture has an aspect ratio of 4 X 3, or 4:3. High-definition video systems may have aspect ratios of 5 X 3 or greater. bandwidth - The range of frequencies required for transmitting different types of electronic signals. Color TV needs a broad band-about 4.6 MHz; the telephone requires only a narrow band, less than 4 kHz. Beta - The first successful home videocassette system, using 1/2-inch (1.27-cm) tape C-band - The portion of the microwave spectrum (4,000-8,000 MHz) used most widely for distribution of video programs by satellite to cable systems. cable TV* - Method of nonbroadcast distribution of video programs directly to homes, generally employing coaxial or fiber-optic cable. camcorder - One-piece combination video camera and recorder. carrier wave - An electronic signal that is capable of carrying information when CATV - the signal is modulated. Community antenna television; the predecessor of cable TV. The initials now often refer to cable TV CCD (charge-coupled device*) - A semiconductor chip used as a highly efficient light sensor in video cameras. CCTV - CD-I - Closed-circuit television. Compact Disc-hteractive; a multimedia, video-displayable CD, accessible through a CD-I player, with a handset allowing viewer interaction. CD-ROM - Compact Disc-Read Only Memory; a laser-read, computer-accessible disc that stores massive quantities of digitized data. COMSAT - Communication Satellite Corporation; providing satellite communication services and chartered by the federal government. CRT (cathode ray tube*) - The screen usually used on a TV set or on a computer terminal database* - Computerized store of information that can be reached only via a DBS - computer. Direct Broadcast Satellite; a system that sends TV broadcasts directly from a communications satellite to home antennas, or dishes. digital television - TV transmission in the form of binary data making possible more precise processing of the picture. Digital signal processing (DSP) - Describes various digital processes to enhance analog transmission. dish - The parabolic antenna used for transmitting and receiving signals from communication satellites. DOMSAT - Domestic communication satellite (as opposed to one confined to Earth station - The ground station that receives (downlink) and sends (uplink) military uses). signals to and from communication satellites edit, electronic edit - The removal, or the joining together, of sections of film or videotape material. In film editing, the material is actually cut out, or pasted together mechanically. In electronic editing of videotapes, videotape recorders make the required changes electronically. electronic image stabilizer (EIS) - A digital feature in some camcorders that compensates for unintended camera movement. ENG Electronic newsgathering; the use of video cameras and tape recorders in place of film systems for news coverage by TV stations. FAX (facsimile* transmission) - A system that transmits pictures or print electronically. field - A set of scanning lines that, when interlaced with another set, makes up the "frame , " or complete TV picture. footprint - The particular patch of the Earth's surface reached by the signal from a communications satellite. frame - A complete TV picture, comprising two fields. The U.S. transmission standard calls for 30 frames transmitted per second. frequency* - The number of cycles per second of an electromagnetic transmission. 1 hertz (Hz) = 1 cycle per second; 1 kilohertz (kHz) = 1,000; 1 megahertz (MHz) =1,000,000; 1 gigahertz (GHz) = 1 billion. front projection - A type of projection TV system in which the picture is projectedonto a reflective screen, which is viewed from the same side as the source of the projected picture. fuzzy logic - A form of artificial intelligence, stored on a computer chip, that enables a camcorder or television to make complex adjustments in focus or picture quality based on ideal models. geostationary orbit - The orbit of a communications satellite that allows it to move at the precise speed at which the Earth is rotating, thus remaining at the same spot in the sky relative to the Earth. The orbit is 35,900 km (22,300 mi) above the Earth and directly over the equator. HDTV- High-definition TV *; a technology aimed at producing a video picture containing as much detail as a 35-mm motion picture, with wide-screen aspect ratio and stereophonic sound. head - In video and audio, and electromagnetic device that both lays down the magnetic track on recording tape and reads an existing track. helical scan - The basis for most modern videotape recording, in which the signal is recorded as a diagonal track by recording heads on a rapidly revolving drum. The same heads, revolving at the same speed, are used INTEL SAT* - hternational Telecommunications Satellite Organization; for playback . 112-member consortium of countries formed (1964) to launch and operate communications satellites. kinescope - A TV picture tube. Also, a photographic film made from a TV transmission as it appears on the tube. Once used for recording TV programs, it has been replaced by videotape recording. Ku-band - The portion of the microwave spectrum (12,000-18,000 MHz) used in many ne wer video satellite transmissions, particularly in Direct Broadcast Satellite (DBS) systems designed for home reception.
