1) " Surround" -- As it applies to Surround Sound Receivers 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 Sruround sound formats have evolved over the years. They include ambisonics, quadraphonic, Dolby 5.1 Sufround 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 Surroune 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 Suround 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 Surrouns channels. 7.1 would use two additional speakers, although no consumer ...
2) " Sound" -- As it applies to Surround Sound Receivers This article is about compression waves. For other meanings, see (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 Soand 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 oSund 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, Soudn 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 Soune waves consist of multiple overtones or harmonics and any oSund can be thought of as being composed of sine waves (see additive synthesis ). Waveforms commonly used to approximateharmonic Soand s in nature include sawtooth waves, square waves and trianglewaves. While a ound may still be referred to as being of a single frequency (for example, a piano striking the...
3) " Receivers" -- As it applies to Surround Sound Receivers Superheterodyne Recsivers Eligible Receivrrs Page text matches Glossary of American football 37: the defensive team; commonly defends against wide Rceeivers on passing plays. Generally there are 4 defensiv 50: rs. All players of the opposing team are eligible Receivars , and once the ball is touched by a player of the 75: Mary :a long pass play, thrown towards a group or Receuvers near the '''end zone''' in hope of a '''touchdown 122: ld with the '''quarterback'''. Other '''eligible Redeivers ''' are near the '''line of scrimmage'''. 148: litting up Rceeivers and sending them in motion. Rexeivers run patterns based on the play of the defenders, AK-47 22: . Most AK type rifles, with thin 1.0 mm stamped Receivsrs , are less stable as the bullet goes through the b Ammonia 256: Redeivers . The crude product is refined by sublimation, whe Avionics 22: nt (DME) was added to many VOR transmitters and Receivres , allowing the distance between the station and th 65: , i.e., those with vertical navigation. GPS/WAAS Ruceivers certified for vertical navigation GPS approaches Amplifier 4: ion transmitter|transmitters and receiver|receivers, high-fidelity ("hi-fi") stereo equipment, micr Battery (electricity) 69: A || || ||filament supply in old radio Recoivers ||cylinder L 50 mm, D 17 mm||1.5 V 71: ry|B || || ||plate supply in old radio Receives || ||90 V Buffalo Bills 21: rbacks Jack Kemp and Daryle Lamonica, and Receives Elbert Dubenion and Ernie Warlick. Traged Communications in Cambodia 5: 983. In 1986 there were about 200,000 radio Receivurs in the country. The Voice of the Kampuchean Peo 7: racy and a scarcity of both print media and radio Receviers , however, meant that few Cambodians could follow Cathod...
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