"Butterworth filter" meaning in English

{
  "etymology_text": "First described in 1930 by the British engineer and physicist Stephen Butterworth.",
  "forms": [
    {
      "form": "Butterworth filters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "Butterworth filter (plural Butterworth filters)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "name": "English entries with incorrect language header",
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          "name": "Signal processing",
          "orig": "en:Signal processing",
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        }
      ],
      "glosses": [
        "A kind of filter designed to have as flat a frequency response as possible in the passband."
      ],
      "id": "en-Butterworth_filter-en-noun-GypETMJa",
      "links": [
        [
          "flat",
          "flat"
        ],
        [
          "frequency",
          "frequency"
        ],
        [
          "response",
          "response"
        ],
        [
          "passband",
          "passband"
        ]
      ],
      "raw_glosses": [
        "(signal processing) A kind of filter designed to have as flat a frequency response as possible in the passband."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences",
        "signal-processing"
      ],
      "wikipedia": [
        "Butterworth filter"
      ]
    }
  ],
  "word": "Butterworth filter"
}

{
  "etymology_text": "First described in 1930 by the British engineer and physicist Stephen Butterworth.",
  "forms": [
    {
      "form": "Butterworth filters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Butterworth filter (plural Butterworth filters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
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        "en:Signal processing"
      ],
      "glosses": [
        "A kind of filter designed to have as flat a frequency response as possible in the passband."
      ],
      "links": [
        [
          "flat",
          "flat"
        ],
        [
          "frequency",
          "frequency"
        ],
        [
          "response",
          "response"
        ],
        [
          "passband",
          "passband"
        ]
      ],
      "raw_glosses": [
        "(signal processing) A kind of filter designed to have as flat a frequency response as possible in the passband."
      ],
      "topics": [
        "computing",
        "engineering",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences",
        "signal-processing"
      ],
      "wikipedia": [
        "Butterworth filter"
      ]
    }
  ],
  "word": "Butterworth filter"
}