{
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  "sourcePath": "src/main/data/docs",
  "docId": "SMPTE.ST251.1996",
  "document": {
    "abstract": "(1.1) This standard specifies the recording system for the video, audio, time and control code, and tracking-control signals for 1/2-in type M-2 helical-scan video tape recorders operating with video signals having a typical scanning structure of 525 lines, 59.94 fields/s, 2:1 interlace, and utilizing the video cassettes specified in ANSI/SMPTE 250M. (1.2) The audio frequency modulation (AFM) recording shown in this standard is optional. Pulse code modulation (PCM) audio recording mode with limited interchangeability, as defined in ANSI/SMPTE 249M, is a secondary audio recording mode which is specified in ANSI/SMPTE 252M. (1.3) Where nominal values are given without tolerances, the interchange performance will be limited by implementation accuracy.",
    "abstract$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "approvalDate": "1996",
    "approvalDate$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "copyright": {
      "holder": "Society of Motion Picture and Television Engineers, Inc.",
      "holder$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.829Z"
      },
      "year": "1996",
      "year$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.829Z"
      }
    },
    "copyright$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "docId": "SMPTE.ST251.1996",
    "docId$meta": {
      "confidence": "high",
      "note": "Calculated from parsed/inferred metadata",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "docLabel": "SMPTE ST 251:1996",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Constructed from parsed/inferred typenumber/number/date",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "docNumber": "251",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Parsed from HTML pubNumber meta tag",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "docSuiteTitle": "Television Analog Recording",
    "docSuiteTitle$meta": {
      "confidence": "high",
      "note": "Parsed from HTML pubSuiteTitle meta tag, or derived from wrapper title for PDF releases",
      "originalValue": null,
      "source": "parsed",
      "updated": "2025-12-12T21:23:35.586Z",
      "version": "extractDocs.js@commit:e5213a0e988e"
    },
    "docTitle": "1/2-in Type M-2 - Electrical Parameters of Video, Audio, Time and Control Code and Tracking Control",
    "docTitle$meta": {
      "confidence": "high",
      "note": "Parsed from HTML pubTitle, or derived from wrapper title for PDF releases",
      "originalValue": "Television Analog Recording - 1/2-in Type M-2 - Electrical Parameters of Video, Audio, Time and Control Code and Tracking Control",
      "overridden": true,
      "source": "parsed",
      "updated": "2025-12-12T21:23:35.586Z",
      "version": "extractDocs.js@commit:e5213a0e988e"
    },
    "docType": "Standard",
    "docType$meta": {
      "confidence": "high",
      "note": "Publication type parsed from HTML",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "doi": "10.5594/SMPTE.ST251.1996",
    "doi$meta": {
      "confidence": "medium",
      "note": "Constructed from parsed/inferred type/date",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "familyId": "251",
    "familyId$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "group": "smpte-24tb-tc",
    "group$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "href": "https://doi.org/10.5594/SMPTE.ST251.1996",
    "href$meta": {
      "confidence": "high",
      "note": "URL generated and verified via redirect resolution",
      "originalValue": null,
      "source": "resolved",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "icsCodes": [
      {
        "code": "33.160.99",
        "description": "Other audio, video and audiovisual equipment"
      },
      {
        "code": "33.170",
        "description": "Television and radio broadcasting"
      }
    ],
    "icsCodes$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "isbn": "978-1-61482-400-8",
    "isbn$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "keywords": [
      "Communication",
      "Networking and Broadcast Technologies",
      "Recording",
      "Television",
      "Tape"
    ],
    "keywords$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "pages": "1–18",
    "pages$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "productNumber": "SSD001401",
    "productNumber$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "publicationDate": "1996-11-29",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Parsed from HTML pubDateTime meta tag",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "publisher": "SMPTE",
    "publisher$meta": {
      "confidence": "high",
      "note": "Parsed from HTML publisher meta tag",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "publisherLocation": {
      "city": "White Plains, NY",
      "city$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.829Z"
      },
      "country": "USA",
      "country$meta": {
        "confidence": "high",
        "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
        "source": "parsed",
        "updated": "2026-05-12T21:55:08.829Z"
      }
    },
    "publisherLocation$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "references": {
      "bibliographic": [
        "R-REC-BT.470-4"
      ],
      "bibliographic$meta": {
        "confidence": "medium",
        "note": "Resolved from sibling -ref.xml via resolveSmpteSourceRefs.js",
        "source": "parsed",
        "updated": "2026-05-18T23:48:48.871Z"
      },
      "normative": [
        "SMPTE.ST249.1996",
        "SMPTE.ST250.1996",
        "SMPTE.ST252.1996",
        "IEC.268-12",
        "SMPTE.ST12.1995"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Extracted from sibling -ref.xml via extractSmpteSourceRefs.js",
        "source": "parsed",
        "updated": "2026-05-18T23:48:48.871Z"
      }
    },
    "releaseTag": "19961129-pub",
    "releaseTag$meta": {
      "confidence": "high",
      "note": "Release tag parsed from URL folder structure",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://pub.smpte.org/doc/st251/19961129-pub/",
      "updated": "2025-10-12T23:28:37.250Z"
    },
    "resolvedHref": "https://pub.smpte.org/doc/st251/19961129-pub/",
    "resolvedHref$meta": {
      "confidence": "high",
      "note": "Final URL resolved via URL redirect verification",
      "originalValue": "https://my.smpte.org/s/product-details?id=a1BVR0000008kbL",
      "overridden": true,
      "source": "resolved",
      "updated": "2025-10-30T22:51:18.443Z",
      "version": "extractDocs.js@commit:ee2844fb1cf2"
    },
    "standardId": "20646",
    "standardId$meta": {
      "confidence": "high",
      "note": "Parsed from sibling XML (_source/SMPTE/APTARA/DL Project Files/08252015 STANDARDS REVISED DEPOSIT/smptes_st-251-1996_1/st0251-1996_stable2004.xml)",
      "source": "parsed",
      "updated": "2026-05-12T21:55:08.829Z"
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s) and other status values",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-12T23:28:37.250Z"
      },
      "amended": false,
      "amended$meta": {
        "confidence": "high",
        "note": "Parsed from wrapper #amendments",
        "originalValue": null,
        "source": "parsed",
        "updated": "2025-10-12T23:28:37.250Z"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s)",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-12T23:28:37.250Z"
      },
      "stabilized": true,
      "stabilized$meta": {
        "confidence": "high",
        "note": "Parsed from wrapper #state",
        "originalValue": null,
        "source": "parsed",
        "updated": "2025-10-12T23:28:37.250Z"
      },
      "superseded": false,
      "superseded$meta": {
        "confidence": "high",
        "note": "Calculated from the releaseTag(s)",
        "originalValue": null,
        "source": "resolved",
        "updated": "2025-10-12T23:28:37.250Z"
      }
    }
  }
}