"Hartley transform" meaning in English

{
  "etymology_text": "It was proposed as an alternative to the Fourier transform in 1942 by American engineer Ralph Hartley.",
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    {
      "form": "Hartley transforms",
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      "expansion": "Hartley transform (plural Hartley transforms)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "An integral transform closely related to the Fourier transform, but which transforms real-valued functions to real-valued functions."
      ],
      "id": "en-Hartley_transform-en-noun-78GeWCCB",
      "links": [
        [
          "mathematics",
          "mathematics"
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        [
          "integral",
          "integral"
        ],
        [
          "transform",
          "transform"
        ],
        [
          "Fourier transform",
          "Fourier transform"
        ],
        [
          "real-valued",
          "real-valued"
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          "function",
          "function"
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      ],
      "raw_glosses": [
        "(mathematics) An integral transform closely related to the Fourier transform, but which transforms real-valued functions to real-valued functions."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Hartley transform",
        "Ralph Hartley"
      ]
    }
  ],
  "word": "Hartley transform"
}

{
  "etymology_text": "It was proposed as an alternative to the Fourier transform in 1942 by American engineer Ralph Hartley.",
  "forms": [
    {
      "form": "Hartley transforms",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "Hartley transform (plural Hartley transforms)",
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    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "An integral transform closely related to the Fourier transform, but which transforms real-valued functions to real-valued functions."
      ],
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          "mathematics",
          "mathematics"
        ],
        [
          "integral",
          "integral"
        ],
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          "transform",
          "transform"
        ],
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          "Fourier transform",
          "Fourier transform"
        ],
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          "real-valued",
          "real-valued"
        ],
        [
          "function",
          "function"
        ]
      ],
      "raw_glosses": [
        "(mathematics) An integral transform closely related to the Fourier transform, but which transforms real-valued functions to real-valued functions."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Hartley transform",
        "Ralph Hartley"
      ]
    }
  ],
  "word": "Hartley transform"
}