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The EF Standard English Test is a standardized test of the English language designed for non-native English speakers. [ 1] It is the product of EF Education First, a global language training company, and a team of language assessment experts including Lyle Bachman, Mari Pearlman, and Ric Luecht. EF compares the EFSET's accuracy to the most ...
A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...
Website. ielts .org. International English Language Testing System ( IELTS / ˈaɪ.ɛlts /) [ 6] is an international standardized test of English language proficiency for non-native English language speakers. It is jointly managed by the British Council, IDP and Cambridge English, [ 6] and was established in 1989.
The Thing (listening device) The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945.
The assistive listening device usually uses a microphone to capture an audio source near its origin and broadcast it wirelessly through means of frequency modulation (FM), infrared (IR), an audio induction loop, or another method. The person who is listening may use a wireless Receiver to tune into the signal and listen at their preferred volume.
Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, and radio and television broadcasting.
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