{
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  "docId": "10.5594-J03664",
  "document": {
    "abbrevTitle": "J SMPTE",
    "abbrevTitle$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "abstract": "This article describes the 8–9 block code, a dc-free channel code for use in digital magnetic recording. The coding strategy is discussed, as well as results of investigation of the properties of the code by computer simulation and hardware experiment. This code can be applied to a digital VTR without major modification to the recording and playback circuits which were previously used for the 8–10 block code. Although further study is required for selecting the best channel code for the digital VTR, the 8–9 block code may be considered a reasonable compromise between the 8–10 block code and the 8-bit code without overhead.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "articleType": "research-article",
    "articleType$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "authors": [
      "Hirofumi Yoshida",
      "Toshiyuki Shimada",
      "Yoshitaka Hashimoto"
    ],
    "authors$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "copyright": {
      "holder": "Society of Motion Picture and Television Engineers, Inc.",
      "holder$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "year": "1983",
      "year$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      }
    },
    "copyright$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docId": "10.5594-J03664",
    "docId$meta": {
      "confidence": "high",
      "note": "Derived from DOI 10.5594/J03664",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docLabel": "SMPTE Journal ( Volume: 92, Issue: 9, September 1983)",
    "docLabel$meta": {
      "confidence": "medium",
      "note": "Composed from journal title, volume, issue and date",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docTitle": "8–9 Block Code: A DC-Free Channel Code for Digital Magnetic Recording",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "docType": "Journal Article",
    "docType$meta": {
      "confidence": "high",
      "note": "NLM <article> — SMPTE journal paper",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "doi": "10.5594/J03664",
    "doi$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "href": "https://doi.org/10.5594/J03664",
    "href$meta": {
      "confidence": "high",
      "note": "Constructed from DOI 10.5594/J03664",
      "source": "inferred",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "issn": {
      "print": "0036-1682",
      "print$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      }
    },
    "issn$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "journalAcronym": "MIJR",
    "journalAcronym$meta": {
      "confidence": "high",
      "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_92_9/MIJR15Vol92No9.xml)",
      "source": "parsed",
      "updated": "2026-06-16T00:32:03.060Z",
      "version": "smpte-journal-issue-xml@v1"
    },
    "number": "9",
    "number$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "pages": "918–922",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "publicationDate": "1983-09-01",
    "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$meta": {
        "confidence": "high",
        "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
        "source": "parsed",
        "updated": "2026-05-22T18:56:53.245Z",
        "version": "smpte-journal-article-nlm@v1"
      },
      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Parsed from journal_metadata XML (_source/SMPTE/APTARA/DL Project Files/08182015 BACKFILE JOURNAL FRESH/smptej_92_9/MIJR15Vol92No9.xml)",
        "source": "parsed",
        "updated": "2026-06-16T00:32:03.060Z",
        "version": "smpte-journal-issue-xml@v1"
      }
    },
    "publisherLocation$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
    },
    "status": {
      "active": true,
      "active$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"
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    },
    "volume": "92",
    "volume$meta": {
      "confidence": "high",
      "note": "Parsed from NLM article XML (_source/SMPTE/HIGHWIRE/Source Bak/smptej/10.5594_J03664.xml)",
      "source": "parsed",
      "updated": "2026-05-22T18:56:53.245Z",
      "version": "smpte-journal-article-nlm@v1"
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