"VU meter" meaning in English

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  "etymology_text": "Abbreviation of volume unit + meter.",
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  "lang_code": "en",
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        {
          "ref": "1978, Craig Anderton, Home recording for musicians:",
          "text": "VU (volume unit) meters are wonderful to look at as their pointers swing merrily back and forth across their brightly-lit faces.",
          "type": "quote"
        },
        {
          "ref": "2006, David E Reese, Lynne S Gross, Brian Gross, Radio production worktext: studio and equipment:",
          "text": "The accuracy of VU meters is sometimes questioned in two areas.",
          "type": "quote"
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        "A display in audio equipment that represents the loudness of the signal."
      ],
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          "loudness",
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          "text": "The ECC Syncro Demo is a demonstration of text scrolling in the GS border area, as well as having VU meters in the border area. Similar to FTA's X-mas demo.",
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        {
          "ref": "1991, Cybernetworx, “VU meters”, in comp.sys.amiga.programmer (Usenet):",
          "text": "Hi, I was wondering if anyone had any source code that showed how to read the values to construct a VU meter from a tracker replay routine.",
          "type": "quote"
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        "Any animated graphical representation of the volume of sound or music (often subdivided across channels)."
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        "(computing, chiefly demoscene) Any animated graphical representation of the volume of sound or music (often subdivided across channels)."
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  "wikipedia": [
    "VU meter"
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  "word": "VU meter"
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  "etymology_text": "Abbreviation of volume unit + meter.",
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        },
        {
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          "text": "The accuracy of VU meters is sometimes questioned in two areas.",
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        }
      ],
      "glosses": [
        "A display in audio equipment that represents the loudness of the signal."
      ],
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          "loudness",
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          "text": "The ECC Syncro Demo is a demonstration of text scrolling in the GS border area, as well as having VU meters in the border area. Similar to FTA's X-mas demo.",
          "type": "quote"
        },
        {
          "ref": "1991, Cybernetworx, “VU meters”, in comp.sys.amiga.programmer (Usenet):",
          "text": "Hi, I was wondering if anyone had any source code that showed how to read the values to construct a VU meter from a tracker replay routine.",
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        "(computing, chiefly demoscene) Any animated graphical representation of the volume of sound or music (often subdivided across channels)."
      ],
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        "demoscene",
        "engineering",
        "lifestyle",
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