{
  "$schema": "/api/schemas/documents.schema.json",
  "apiVersion": "1.1.0",
  "lastModified": "2026-10-02T16:10:03.576Z",
  "sourcePath": "src/main/data/docs",
  "docId": "CST.RT041.2021",
  "document": {
    "abstract": "The purpose of this document is to define recommendations on acoustic characteristics, together with evaluation methodologies, applicable to cinema theaters with standardized sound reproduction systems (that is, up to 7.1 multichannel at the date of publication of this document), in the following areas:\n• Ambient background noise level with all equipment running;\n• Acoustic reverberation time;\n• Acoustic insulation between theaters.\nGuidance is also given on the correct positioning of the surround-channel loudspeakers.\nWork on all the acoustic conditions of cinema theaters is under way within international standards bodies and in France. This recommendation will be updated to take it into account as soon as the results of that work are published.",
    "abstract$meta": {
      "confidence": "medium",
      "note": "English translation of the publisher's French text",
      "originalValue": null,
      "reviewRequired": true,
      "source": "inferred",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "abstractOriginal": "Le présent document a pour objet de définir les recommandations concernant les caractéristiques acoustiques, ainsi que les méthodologies d’évaluation, applicables aux salles de cinéma disposant de systèmes de reproduction sonore normalisés (donc jusqu’au multicanal 7.1 en date de publication du présent document), dans les domaines suivants :\n• Niveau de bruit de fond ambiant tous équipements en fonctionnement ;\n• Temps de réverbération acoustique ;\n• Isolation acoustique entre salles.\nIl est également proposé des indications sur le bon positionnement des enceintes acoustiques des canaux d’ambiance.\nDes travaux sur l’ensemble des conditions acoustiques des salles de spectacles cinématographiques sont en cours au sein des organismes de standardisation internationaux et en France. La présente recommandation sera mise à jour pour en tenir compte, dès publication des résultats de ces travaux.",
    "abstractOriginal$meta": {
      "confidence": "high",
      "note": "Read from the publisher's document or website",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "details": "French-language CST recommendation prepared by the CST sound department (validated 30 September, published 4 October 2021) on the acoustics of cinema auditoriums with standardized sound systems up to 7.1: background noise (NR 27 limit), reverberation time against room volume with a tolerance mask, and sound insulation between auditoriums (pink noise at 103 dB, at most 3 dB emergence per octave band), plus loudspeaker placement and calibration to 85 dB(C).",
    "details$meta": {
      "confidence": "medium",
      "note": "Derived (translation, summary or registry convention)",
      "originalValue": null,
      "source": "inferred",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "docId": "CST.RT041.2021",
    "docId$meta": {
      "confidence": "medium",
      "note": "Derived (translation, summary or registry convention)",
      "originalValue": null,
      "source": "inferred",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "docLabel": "CST-RT-041-2021",
    "docLabel$meta": {
      "confidence": "high",
      "note": "Printed \"cST-rT-041–2021\"; normalised",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "docNumber": "041",
    "docNumber$meta": {
      "confidence": "high",
      "note": "Read from the publisher's document or website",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "docTitle": "Acoustic Characteristics of Cinema Auditoriums",
    "docTitle$meta": {
      "confidence": "medium",
      "note": "English translation of the publisher's French text",
      "originalValue": null,
      "reviewRequired": true,
      "source": "inferred",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "docTitleOriginal": "Caractéristiques acoustiques des salles de cinéma",
    "docTitleOriginal$meta": {
      "confidence": "high",
      "note": "Cover \"Recommandation technique sur les caractéristiques acoustiques des salles de cinéma\"; generic \"Recommandation technique sur les\" prefix dropped",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "docType": "Recommendation",
    "docType$meta": {
      "confidence": "high",
      "note": "Read from the publisher's document or website",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/recommandations-techniques-cst/",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "href": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
    "href$meta": {
      "confidence": "high",
      "note": "Read from the publisher's document or website",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/recommandations-techniques-cst/",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "keywords": [
      "Acoustics",
      "Cinema Sound",
      "Theater"
    ],
    "keywords$meta": {
      "confidence": "medium",
      "note": "Derived (translation, summary or registry convention)",
      "originalValue": null,
      "source": "inferred",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "language": "fr",
    "language$meta": {
      "confidence": "high",
      "note": "Read from the publisher's document or website",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "publicationDate": "2021-10-04",
    "publicationDate$meta": {
      "confidence": "high",
      "note": "Cover \"publiée le 4 octobre 2021\" (validated 30 September 2021)",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "publisher": "CST",
    "publisher$meta": {
      "confidence": "high",
      "note": "Read from the publisher's document or website",
      "originalValue": null,
      "source": "parsed",
      "sourceUrl": "https://cst.fr/recommandations-techniques-cst/",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    },
    "references": {
      "bibliographic": [
        "SMPTE.ST2098-5",
        "orphan/CST.RT041.2021/h:e46bfaef",
        "orphan/CST.RT041.2021/h:3cd407a6",
        "orphan/CST.RT041.2021/h:ac3d31d1"
      ],
      "bibliographic$meta": {
        "confidence": "high",
        "note": "Citations read from the document; refIds from parseRefId",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
        "updated": "2026-10-02T16:10:03.576Z",
        "version": "extractDocs.js@commit:41a6e931279b"
      },
      "normative": [
        "ISO.2969",
        "ISO.26428-2",
        "ISO.26428-3",
        "ISO.26429-3",
        "ISO.26432-2",
        "AFNOR.NFS27-100.2014",
        "AFNOR.NFS30-101",
        "SMPTE.RP200.2012",
        "SMPTE.ST202.2010",
        "SMPTE.RP2096-1.2017",
        "SMPTE.ST2095-1",
        "ISO.9568.1988",
        "AFNOR.NFS30-010.1974",
        "ISO.3382-2.2008",
        "CST.RT022",
        "IEC.61672-1",
        "ISO.1996.1971",
        "SMPTE.RP141"
      ],
      "normative$meta": {
        "confidence": "high",
        "note": "Citations read from the document; refIds from parseRefId",
        "originalValue": [],
        "source": "parsed",
        "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
        "updated": "2026-10-02T16:10:03.576Z",
        "version": "extractDocs.js@commit:41a6e931279b"
      }
    },
    "status": {
      "active": true,
      "active$meta": {
        "confidence": "medium",
        "note": "Derived (translation, summary or registry convention)",
        "originalValue": null,
        "source": "inferred",
        "sourceUrl": "https://cst.fr/recommandations-techniques-cst/",
        "updated": "2026-10-02T16:10:03.576Z",
        "version": "extractDocs.js@commit:41a6e931279b"
      },
      "latestVersion": true,
      "latestVersion$meta": {
        "confidence": "medium",
        "note": "Derived (translation, summary or registry convention)",
        "originalValue": null,
        "source": "inferred",
        "sourceUrl": "https://cst.fr/recommandations-techniques-cst/",
        "updated": "2026-10-02T16:10:03.576Z",
        "version": "extractDocs.js@commit:41a6e931279b"
      }
    },
    "translatedBy": "msrbot",
    "translatedBy$meta": {
      "confidence": "medium",
      "note": "Derived (translation, summary or registry convention)",
      "originalValue": null,
      "source": "inferred",
      "sourceUrl": "https://cst.fr/download/33/recommandations-techniques/1018/cst-rt-041.pdf",
      "updated": "2026-10-02T16:10:03.576Z",
      "version": "extractDocs.js@commit:41a6e931279b"
    }
  }
}