{
  "$schema": "/api/schemas/documents.schema.json",
  "apiVersion": "1.0.0",
  "generatedAt": "2026-07-09T21:16:49.031Z",
  "sourcePath": "src/main/data/docs",
  "docId": "10.5594-J01501",
  "document": {
    "abbrevTitle": "J SMPTE",
    "abbrevTitle$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "abstract": "Multiple generation copies of videotape recordings are, even today, still subject to considerable reductions in quality. At the present time, it is difficult to foresee any progress being made in the tape, head, and amplifier fields which will bring about any noticeable improvement, as long as the analog FM recording method is retained. On the other hand, recording with digitized video signals would bring definite improvements without incurring any basic disadvantages such as increased tape consumption. The quality of copies (generations) would, with the exception of dropouts, no longer be influenced by the machine. At the moment, tape recorders with rotating head arrangements offer the highest storage density by far and, for this reason, are particularly suitable for digital video recording. Wavelengths of approximately 1 μm, using a corresponding code of 2 bits/μm, can be read with certainty. A track width of 40 μm yields a S/N ratio better than 26 dB and a corresponding BER (bit error rate) of about 10-6. Including safety margins, a recording density of 3 Mbit/cm2 can be achieved. Assuming that a future European digital video system will use a data rate of approximately 160 Mbit/s, a transport velocity of about 24 cm/s is required when 1-in tape is employed. A tape speed close to 24 cm/s is customary for the present generation of helical-scan machines in the 625-line system, recording analog signals.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "authors": [
      {
        "name": "Hubert Foerster"
      },
      {
        "name": "Josef Sochor"
      }
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Object form (schema 2.3.0) migrated from string form via migrateAuthorsToObjectForm.js; bio/affiliation backfilled from _source/SMPTE/HIGHWIRE/ NLM <contrib-group>+<aff>+<bio>",
      "source": "parsed",
      "updated": "2026-06-23T00:04:25.562Z",
      "version": "authors-migrate-object-form@v1"
    },
    "contentType": "orig-research",
    "contentType$meta": {
      "confidence": "high",
      "note": "Reclassified from info-society by title review (2026-07-09, infoSocietyReview.md): 'orig-research'",
      "originalValue": "info-society",
      "source": "resolved",
      "updated": "2026-07-09T19:37:05.512Z",
      "version": "contenttype-fixes@v1"
    },
    "copyright": {
      "holder": "Society of Motion Picture and Television Engineers, Inc.",
      "holder$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "year": "1981",
      "year$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      }
    },
    "copyright$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docId": "10.5594-J01501",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from DOI 10.5594/J01501",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docLabel": "SMPTE Journal ( Volume: 90, Issue: 2, February 1981)",
    "docLabel$meta": {
      "confidence": "medium",
      "note": "Composed from journal title, volume, issue and date",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docTitle": "Digital Video Recording in the 625-Line System",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docType": "Journal Article",
    "docType$meta": {
      "confidence": "high",
      "note": "NLM <article> — SMPTE journal paper",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "doi": "10.5594/J01501",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "href": "https://doi.org/10.5594/J01501",
    "href$meta": {
      "confidence": "high",
      "note": "Constructed from DOI 10.5594/J01501",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "issn": {
      "print": "0036-1682",
      "print$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      }
    },
    "issn$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "journalAcronym": "MIJR",
    "journalAcronym$meta": {
      "confidence": "high",
      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_90_2/MIJR15Vol90No2.xml)",
      "source": "parsed",
      "updated": "2026-06-16T00:32:03.060Z",
      "version": "smpte-journal-issue-xml@v1"
    },
    "journalTitle": "SMPTE Journal",
    "journalTitle$meta": {
      "confidence": "high",
      "note": "Era-accurate journal title from SMPTE canonical repository (periodical parent at time of publication) (smpte-canonical-audit/canonicalLibrary.*.json)",
      "originalValue": null,
      "source": "parsed",
      "updated": "2026-07-08T00:35:38.133Z",
      "version": "smpte-canonical-repo@v1"
    },
    "number": "2",
    "number$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "pages": "113–115",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "publicationDate": "1981-02-01",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Day absent in NLM source — padded to 01",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "publisher": "SMPTE",
    "publisher$meta": {
      "confidence": "high",
      "note": "Normalised to registry \"SMPTE\" convention from NLM publisher-name (The Society of Motion Picture and Television Engineers)",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "publisherLocation": {
      "city": "White Plains, NY",
      "city$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_90_2/MIJR15Vol90No2.xml)",
        "source": "parsed",
        "updated": "2026-06-16T00:32:03.060Z",
        "version": "smpte-journal-issue-xml@v1"
      }
    },
    "publisherLocation$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "resolvedHref": "https://journal.smpte.org/periodicals/SMPTE%20Journal/90/2/7/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Backfilled from url.validate report #resolvedHref",
      "originalValue": null,
      "source": "resolved",
      "updated": "2026-06-19T20:59:07.404Z"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "medium",
        "note": "No explicit status in NLM source — journal articles default active",
        "source": "inferred",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      }
    },
    "volume": "90",
    "volume$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J01501.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    }
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}