{
  "version": "annotated-original-v1",
  "publication": "US20230225659A1",
  "title": "How an earbud chooses where to measure",
  "subtitle": "The original drawing, with the controller, carrier and electrode groups explained where they appear.",
  "figure": "FIG. 6",
  "figure_page": 7,
  "description_page": 21,
  "original_sha256": "925fb5bc2ca66c896dc7900c97ec0bc4595121e068f86421f54a138a3f3e0f0a",
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  "diagram_treatment": "Original FIG. 6 preserved at its original proportions. Four numbered callouts identify existing parts; leader lines are annotations, not new electrical connections. No particular electrode subset is marked as selected.",
  "readings": [
    {
      "id": "available",
      "title": "Start with the available electrodes.",
      "text": "FIG. 6 identifies eight active electrodes (604a-604h) and three reference electrodes (606a-606c). The electrode carrier (608) connects them with the controller (610).",
      "paragraph": "0068",
      "quote": "The active electrodes 604a-604h and the reference electrodes 606a-606c may be carried by an electrode carrier 608"
    },
    {
      "id": "choose",
      "title": "Choose the subsets used for sensing.",
      "text": "The controller may choose one or more electrodes from each group. The description lists impedance, noise, distance between active and reference electrodes, and half-cell potentials as selection criteria.",
      "paragraph": "0069",
      "quote": "The controller 610 may select one or more active electrodes 604a-604h to form a subset of active electrodes"
    },
    {
      "id": "measure",
      "title": "Measure using the chosen subsets.",
      "text": "The controller may then perform a measurement test using both selected subsets. Paragraph [0069] names EEG measurement as one example.",
      "paragraph": "0069",
      "quote": "The controller 610 may then perform a measurement test using the selected subsets of active and reference electrodes."
    }
  ],
  "question": "What makes this more than a fixed set of earbud electrodes?",
  "answer": "Selection is part of the design. The controller can choose which active and reference electrodes participate in a measurement, using the criteria set out in the description. The callouts identify those parts; paragraph [0069] explains the choice before measurement.",
  "additional_source_quote": "In one example, the measurement may be for measuring an EEG.",
  "editorial_review": {
    "method": "Codex visual inspection of preserved FIG. 6 and PDF page 21, paragraphs [0068]–[0069], on 15 September 2026; annotation targets reviewed against the original drawing. No provider call.",
    "source_checked": true,
    "annotation_targets_checked": true,
    "reference_numbers_checked": true,
    "relationships_checked": true,
    "original_preserved": true,
    "no_selected_subset_implied": true,
    "geometry_preserved": true
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  "annotations": [
    {
      "number": 1,
      "title": "The controller chooses.",
      "reference": "610 / Controller",
      "text": "It may choose an active subset and a reference subset, then perform a measurement test using both. EEG is one example.",
      "paragraph": "0069",
      "quote": "The controller 610 may then perform a measurement test using the selected subsets of active and reference electrodes.",
      "marker": [
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      ],
      "target": [
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    },
    {
      "number": 2,
      "title": "The carrier connects.",
      "reference": "608 / Electrode carrier",
      "text": "The hatched carrier holds the electrodes and may electrically couple them to the controller. The description names a flex or microaxial cables.",
      "paragraph": "0068",
      "quote": "may be electrically coupled to a controller 610",
      "marker": [
        413,
        425
      ],
      "target": [
        413,
        497
      ]
    },
    {
      "number": 3,
      "title": "Eight active electrodes.",
      "reference": "604a–604h / Active electrodes",
      "text": "These eight contacts form the active group shown here. The controller may select one or more; the drawing does not identify a chosen subset.",
      "paragraph": "0069",
      "quote": "The controller 610 may select one or more active electrodes 604a-604h to form a subset of active electrodes",
      "marker": [
        931,
        214
      ],
      "target": [
        852,
        234
      ]
    },
    {
      "number": 4,
      "title": "Three reference electrodes.",
      "reference": "606a–606c / Reference electrodes",
      "text": "A reference subset is also selected. The measurement uses the selected active and reference subsets together.",
      "paragraph": "0069",
      "quote": "The controller 610 may then perform a measurement test using the selected subsets of active and reference electrodes.",
      "marker": [
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      ],
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