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  2. 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.

  3. 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 ...

  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. EF English Proficiency Index - Wikipedia

    en.wikipedia.org/wiki/EF_English_Proficiency_Index

    424 – 400 (Very low) below 400 (Very low) No data or national language. The EF English Proficiency Index ( EF EPI) attempts to rank countries by the equity of English language skills amongst those adults who took the EF test. [ 2] It is the product of EF Education First, an international education company, and draws its conclusions from data ...

  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. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    Microphone. Shure Brothers microphone, model 55S, multi-impedance "Small Unidyne" dynamic from 1951. A microphone, colloquially called a mic ( / maɪk / ), [ 1] or mike, [ a] is a transducer that converts sound into an electrical signal.

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