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Quadraphonic sound. Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for the reproduction of sound signals that are (wholly or in part) independent of one ...
Surround sound. Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener ( surround channels ). Its first application was in movie theaters. Prior to surround sound, theater sound systems commonly had three screen channels of sound that ...
Wall of Sound (Grateful Dead) The Wall of Sound was an enormous sound reinforcement system designed in 1973 specifically for the Grateful Dead 's live performances. The largest concert sound system built at that time, [ 1][ 2] the Wall of Sound fulfilled lead designer Owsley "Bear" Stanley's desire for a distortion -free sound system that could ...
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A PC speaker is a loudspeaker built into some IBM PC compatible computers. The first IBM Personal Computer, model 5150, employed a standard 2.25 inch magnetic driven (dynamic) speaker. [1] More recent computers use a tiny moving-iron or piezo speaker instead. [2] The speaker allows software and firmware to provide auditory feedback to a user ...
Zolotarev's lemma. In number theory, Zolotarev's lemma states that the Legendre symbol. for an integer a modulo an odd prime number p, where p does not divide a, can be computed as the sign of a permutation: where ε denotes the signature of a permutation and π a is the permutation of the nonzero residue classes mod p induced by multiplication ...
Manufacturer. Martin Marietta. Lockheed Martin. Variants. Mk 57. Mk 70 Mod 1. The Mark 41 Vertical Launching System ( Mk 41 VLS) is a shipborne missile canister launching system which provides a rapid-fire launch capability against hostile threats. [ 1] The Vertical Launch System (VLS) concept was derived from work on the Aegis Combat System.
The multiplicative order of a number a modulo n is the order of a in the multiplicative group whose elements are the residues modulo n of the numbers coprime to n, and whose group operation is multiplication modulo n. This is the group of units of the ring Zn; it has φ ( n) elements, φ being Euler's totient function, and is denoted as U ( n ...