{
  "annotation_id": "5549215a-0f69-4832-a52f-9f0c1edba722",
  "date_created": "2026-03-02T18:01:00.404000Z",
  "date_modified": "2026-03-02T18:01:00.404000Z",
  "file_hash": "c00727e5ccde956d0aefdd920d435c48cc4ee5a1b0f7a1cff98ff653ac06e763",
  "private": false,
  "record": {
    "abstract": "For physical processes which express themselves as a frequency, for example\nmagnetic field measurements using optically-pumped alkali-vapor magnetometers,\nthe precise extraction of the frequency from the noisy signal is a classical\nproblem. We describe herein a frequency measurement system based on an\ninexpensive commercially available computer sound card coupled with a software\nsingle-tone estimator which reaches Cram\\\u0027er--Rao limited performance, a\nfeature which commercial frequency counters often lack. Characterization of the\nsystem and examples of its successful application to magnetometry are\npresented.",
    "arxiv_id": "physics/0506068",
    "authors": [
      "S. Groeger",
      "G. Bison",
      "P. E. Knowles",
      "A. Weis"
    ],
    "categories": [
      "physics.ins-det"
    ],
    "doi": "10.1051/epjap:2006020",
    "title": "A sound card based multi-channel frequency measurement system",
    "url": "https://arxiv.org/abs/physics/0506068"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e012539e-35b7-486e-a17a-742b46bf833f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}