# What changed between ATSC A/85:2013 and A/85:2026-07 for dialogue-gated measurement, target loudness, true peak and streaming?

- id: art_01M5NE1HWE8FDFC5T5CC4RBW62
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T13, T14 · tags: none
- updated: 2026-10-23T22:27:58.471Z
- url: https://veyrul.com/articles/art_01M5NE1HWE8FDFC5T5CC4RBW62

ATSC A/85:2026-07 keeps the 2013 exchange targets (-24 LKFS with about +/-2 dB, true peak below -2 dBTP) but adds an approximately +/-0.5 dBTP meter tolerance not present in the 2013 section 6, adds Annex L (streaming) and Annex M (one-page summary), and states that BS.1770-3/-4/-5 share identical loudness and true-peak algorithms; Annex M says long-form dialogue level is measured with BS.1770-1 without the relative gate and describes a -23 to -27 LKFS practical range for streaming operators.

ATSC A/85:2026-07 keeps the 2013 exchange targets (-24 LKFS with about +/-2 dB, true peak below -2 dBTP) but adds an approximately +/-0.5 dBTP meter tolerance not present in the 2013 section 6, adds Annex L (streaming) and Annex M (one-page summary), and states that BS.1770-3/-4/-5 share identical loudness and true-peak algorithms; Annex M says long-form dialogue level is measured with BS.1770-1 without the relative gate and describes a -23 to -27 LKFS practical range for streaming operators.

Curator qualifications: Approval date (8 July 2026) not checked against the document text. Short-form full-mix measurement detail in Annex M not re-read verbatim. PDF text only; no loudness measured.

Limitations: ATSC recommended practice; FCC CALM context not re-read.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://www.atsc.org/wp-content/uploads/2026/07/A85-2026-07.pdf",
      "note": "A85-2026-07.pdf (pdftotext lines 53-56, 1200, 1430-1440); A85-2013-with-Corrigendum-No-1.pdf section 6 (lines ~1290-1297); A85-2026-07-Annex-M.pdf (lines 51, 60-70)"
    },
    {
      "url": "https://www.atsc.org/wp-content/uploads/2025/06/A85-2013-with-Corrigendum-No-1.pdf",
      "note": "A85-2026-07.pdf (pdftotext lines 53-56, 1200, 1430-1440); A85-2013-with-Corrigendum-No-1.pdf section 6 (lines ~1290-1297); A85-2026-07-Annex-M.pdf (lines 51, 60-70)"
    },
    {
      "url": "https://www.atsc.org/wp-content/uploads/2026/07/A85-2026-07-Annex-M.pdf",
      "note": "A85-2026-07.pdf (pdftotext lines 53-56, 1200, 1430-1440); A85-2013-with-Corrigendum-No-1.pdf section 6 (lines ~1290-1297); A85-2026-07-Annex-M.pdf (lines 51, 60-70)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] ATSC A/85:2026-07 keeps the 2013 exchange targets (-24 LKFS with about +/-2 dB, true peak below -2 dBTP) but adds an approximately +/-0.5 dBTP meter tolerance not present in the 2013 section 6, adds Annex L (streaming) and Annex M (one-page summary), and states that BS.1770-3/-4/-5 share identical loudness and true-peak algorithms; Annex M says long-form dialogue level is measured with BS.1770-1 without the relative gate and describes a -23 to -27 LKFS practical range for streaming operators. · locator: A85-2026-07.pdf (pdftotext lines 53-56, 1200, 1430-1440); A85-2013-with-Corrigendum-No-1.pdf section 6 (lines ~1290-1297); A85-2026-07-Annex-M.pdf (lines 51, 60-70) · source: https://www.atsc.org/wp-content/uploads/2026/07/A85-2026-07.pdf

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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