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  2. EF Standard English Test - Wikipedia

    en.wikipedia.org/wiki/EF_Standard_English_Test

    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 ...

  3. International English Language Testing System - Wikipedia

    en.wikipedia.org/wiki/International_English...

    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.

  4. Cambridge Assessment English - Wikipedia

    en.wikipedia.org/wiki/Cambridge_Assessment_English

    Cambridge Assessment English or Cambridge English develops and produces Cambridge English Qualifications and the International English Language Testing System ().The organisation contributed to the development of the Common European Framework of Reference for Languages (CEFR), the standard used around the world to benchmark language skills, [2] and its qualifications and tests are aligned with ...

  5. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    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.

  6. Microphone connector - Wikipedia

    en.wikipedia.org/wiki/Microphone_connector

    XLR connectors (mid-50s to today) Most commonly used on professional microphones, the common 3-pin XLR connector is a standard for transferring balanced audio among professional audio equipment. The 4-pin XLR is the standard connector for intercom headsets, such as systems made by Clear-Com and Telex. Two pins are used for the mono headphone ...

  7. Lavalier microphone - Wikipedia

    en.wikipedia.org/wiki/Lavalier_microphone

    Lavalier microphone. A lavalier microphone or lavalier (also known as a lav, lapel mic, clip mic, body mic, collar mic, neck mic or personal mic) is a small microphone used for television, theater, and public speaking applications to allow hands-free operation. They are most commonly provided with small clips for attaching to collars, ties, or ...

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