Resource Center: How to Speak A/V
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Entries starting with: V-chip: An integrated circuit built into a TV set that allows parents to automatically restrict the viewing of objectionable material. It works in conjunction with program-content codes transmitted with the TV signal. vent: see bass-reflex, port. vertical blanking interval (VBI): The part of a TV signal that is not displayed to allow time for a direct-view CRT set’s electron gun to move from the bottom to the top of the screen. EPG, closed captioning, Internet links, and other data can be inserted in the VBI. VGA: A PC graphics standard equivalent to RGB+H/V and found as an output option on some HDTV tuners and as an input on some HDTV monitors and projectors. Instead of five RCA jacks, it uses a 15-pin D-Sub connector. Video CD: A forerunner to the DVD system designed to produce “VHS-quality” video using a standard-size CD and MPEG-1 video encoding; also see MPEG-2. Video mode: One of the two methods of recording video on a DVD-RW disc (the other is VR mode); essentially the same format used for commercial DVD-Video discs. viewfinder: A display device used to monitor the image while recording with a camcorder; common types range from simple optical lenses to miniature CRTs or LCD screens viewed through magnifying optics. viewscreen: A direct-view display device on a camcorder — typically an LCD screen measuring from 2 to 4 inches (diagonal) — used to monitor the image while recording. virtual surround sound: A system that can simulate the effect of multichannel surround sound using only two speakers or headphones. Many virtual speaker systems work well if you sit exactly in the “sweet spot,” but the illusion diminishes or vanishes if you move. voice coil: In a dynamic speaker or microphone, a hollow cylinder wound with wire that is immersed in the field of a permanent magnet and attached to a diaphragm. In a speaker, current through the wire from the amplifier creates an alternating magnetic field in the coil that causes it and the diaphragm to move back and forth according to changes in the input signal. In a microphone, sound moving the diaphragm also moves the coil, generating a signal voltage in it that is fed to a recorder or directly to a sound system for amplification. voltage: The measure, in volts, of the strength of an electrical field; it can be thought of as pressure pushing electrical charges through a circuit, forming a current. VR mode: One of the two methods of recording video on a DVD-RW disc (the other is Video mode). Among other things, VR mode allows fine-grained editing operations, but the recordings are less likely to be compatible with standard DVD players than Video mode recordings. Abbreviations |
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