acoustic communications

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• Underwater acoustic communication — is a technique of sending and receiving message below water. There are several ways of doing such communication but the most common is using hydrophones. Under water communication is difficult due to factors like multi path propagation, time… …   Wikipedia

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• wireless communications — System using radio frequency, infrared, microwave, or other types of electromagnetic or acoustic waves in place of wires, cables, or fibre optics to transmit signals or data. Wireless devices include cell phones, two way radios, remote garage… …   Universalium

• Underwater acoustics — The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.HistoryUnderwater sound… …   Wikipedia

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• линия акустической связи — В системе аварийного управления подводным устьевым оборудованием [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN acoustic communications link …   Справочник технического переводчика

• Special reconnaissance — This article is a subset article under Human Intelligence. For a complete hierarchical list of articles, see the intelligence cycle management hierarchy. Special Reconnaissance (SR) is conducted by small units of highly trained military personnel …   Wikipedia

• warning system — ▪ military technology Introduction       in military science, any method used to detect the situation or intention of an enemy so that warning can be given.       Because military tactics from time immemorial have stressed the value of surprise… …   Universalium