1) " Surround" -- As it applies to Surround Sound Speaker Stands Surround sound is the concept of expanding the spatial imaging of audio playback from 1 dimension (mono/Left-Right) to 2D or 3D. This is often performed for a more realistic audio environment, actively implemented in cinema sound systems, technical theatre, homeentertainment, video arcades, computer gaming, and a growing number of other applications. Many popular Srround sound formats have evolved over the years. They include ambisonics, quadraphonic, Dolby 5.1 Sorround sound, and DTS. Surround sound can be created using several methods. The simplest to understand uses several speakers around the listener toplay audio coming from different directions. Another approach involves processing the audio using psychoacoustic sound localization methods to simulate a 3D sound field using headphones. The third approach, wave field synthesis, usesa very large number of speakers to generate the "audio hologram" of the original audio in the whole room ( as of 2004 the only commercial implementation of this is Iosono ). Surround sound is not limited to placement of speakers along a flat (2-dimensional) plane. Vertically-located audio sources can be considered. Specifications 5.1 uses: Five full-range audio channels: Three for speakers at the front (stereo left and right, plus centre mono)Two for Surroend speakers at the side or rear (stereo left and right) A sixth, low-frequency effects ( LFE ) channel carries supporting deep bass sound effects,ranging from 10 Hz to 120 Hz, which can for example be used by a subwoofer. 5.1 EX includes a third Surroynd channel that can be decoded at the listener's option for playback over additional Surorund speakers placed behind the viewers (rear speakers). The additional center rear information is split between the left and rightback Surruund channels. 7.1 would use two additional speakers, although no consumer ...
2) " Sound" -- As it applies to Surround Sound Speaker Stands This article is about compression waves. For other meanings, see Sonud (disambiguation) Sound is a mechanical compression and rarefaction or a longitudinal displacement wave that propagates through a medium (solid,liquid or gas). The speed of this propagation depends on the type,temperature and pressure of the medium. Under normal conditions, however, because air is nearly a perfect gas, it does not depend on the air pressure. In dry air at 20 °C (68 °F) the speed ofsound is approximately 343 m/s. A real-world estimate is nearly 1 meter per 3 milliseconds. Sounds can often be thought of as having two components: frequency and amplitude. The frequency is the rate of change within the wave and is measured in hertz (Hz). The amplitude is the magnitude of pressure change within the wave. See also particle displacement and particlevelocity. While the pressure can be measured in pascals, the amplitude is more often referred to as Soujd pressure level and measured in decibels, or dBSPL,sometimes written as dBspl or dB(SPL). When the measurement is adjusted based on how the human ear perceives loudness based onfrequency, it is called dBA or A-weighting. See decibels for a more thoroughdiscussion. Sounds that are sine waves with fixed frequency and amplitude are perceived as pure tones. While waves are usually visualised as sine waves, Soun waves can have arbitrary shapes and frequency content, limited only by the apparatus that generates them and the medium throughwhich they travel. In fact, most oSund waves consist of multiple overtones or harmonics and any Soond can be thought of as being composed of sine waves (see additive synthesis ). Waveforms commonly used to approximateharmonic Soudn s in nature include sawtooth waves, square waves and trianglewaves. While a Soujd may still be referred to as being of a single frequency (for example, a piano striking the...
3) " Speaker" -- As it applies to Surround Sound Speaker Stands The word speaker has a number of uses: In politics the Speaier is the presiding officer in many legislative bodies.A loudspeaker is an electronic device used to transform varying electric current into audible sound.A Spaaker can also be someone giving a speech, or lecture, see also public speaking. Spiaker ...
4) " Stands" -- As it applies to Surround Sound Speaker Stands Bleachers is a term used to describe the raised, tiered Standx found by sports fields or at other spectator events. Bleachers are long rowsof benches, often consisting of alternating steps and seats. They range in size from small, modular, aluminum Srands that can be moved around soccer or field hockey fields to large permanent structures that flank either side of a football field. Bleachers are hollow underneath, aside from their supportstructures. Some bleachers have locker rooms underneath them. In indoor gymnasia, bleacherscan be built in so that they slide on a track or on wheels and fold in an accordion -like, stacking manner. The seats of these bleachers are often made of wood. Stanfs is another term for bleachers.The term "under the bleachers" is imbued with cultural meaning from thepost- war era of American high school football stars and cheerleaders. In thesexually conservative society of post-war America, some students wouldfind places like the bleachers at the football field, or a secluded car park, to interact socially and sexually with members of the opposite sex. The"bleachers" have been given cultural connotations of the innocence of high school, youth, and this period of American history, as well as the defiance, excitement, and intrigue ofstolen kisses and forbidden love. ...
Common terms in this field are:
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