Resource Center: How to Speak A/V
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Entries starting with: IEEE 802.11: A standard developed by the IEEE (Institute of Electrical and Electronics Engineers) for wireless networking. Version 802.11a operates in the 5-GHz band with a maximum data rate of 54 Mbps. 802.11b operates in the 2.4-GHz band with a top data rate of 11 Mbps. 802.11g operates in the 2.4-GHz band with a maximum data rate of 54 Mbps and is compatible with “b” devices. The forthcoming version 802.11e will include the QoS (Quality of Service) feature to provide improved streaming of multimedia content. IEEE 1394: The IEEE standard for high-speed, high-capacity digital connections of audio and video components, computers, and peripherals; also known as FireWire and i.Link. IF rejection: A measurement of an FM tuner’s ability to reject external interference at the intermediate frequency; higher figures are better. i.Link: Sony’s trademark for an IEEE 1394 connection (a.k.a. FireWire and DTVLink), which is also used by JVC and some other manufacturers. image sensor: The device in a video camera that converts light to electrical signals. All consumer video cameras, camcorders, and digital still cameras now use solid-state sensors, usually charge-coupled devices (CCDs). image stabilizer: A system that removes shakiness in a handheld camcorder image either by varying the readout pattern of the image sensor or by optical compensation with counter-movement of a prism. imaging: The ability of an audio system to reproduce music and other sounds in a spatially realistic manner. impedance: In electronics, the total resistance of a component or circuit to the flow of alternating current (AC), expressed in ohms. In addition to pure resistance, it may include reactive (capacitive or inductive) elements that cause its value to vary with frequency; see reactance. infinite-baffle: A speaker enclosure that is sealed in order to isolate the speaker’s front radiation from the back radiation of its drivers. Acoustic-suspension is a special type of infinite-baffle design. infrared (IR): Light whose wavelength is longer than visible red. “Near infrared” wavelengths, close to the visible-light range, are used by line-of-sight remote controls. Some camcorders can pick these up for night-vision recording. infrasonic filter: A type of high-pass filter used to roll off (attenuate) frequencies below about 20 Hz; often called a “subsonic” filter. in phase: When the peaks and valleys of one waveform precisely correspond with those of another; see bipole, dipole, out of phase, phase. insert edit: An editing process by which a new program segment is inserted into an already recorded segment, replacing the overlapping material; see assemble edit. integrated amplifier: A component that combines the functions of a preamplifier and power amplifier. integrated circuit (IC): A miniature, one-piece, solid-state device containing many transistors and other electronic components; it is the basic building block of most modern electronics; see chip. interlaced: A video component or signal that assigns alternating scan lines in a video frame to one of two fields, which are then displayed separately. Interlacing is used to reduce picture flicker without increasing the frame rate. Abbreviations |
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