# ISO 226:2003 — Withdrawn and superseded ISO standards

For ISO 226:2003, item title is Acoustics — Normal equal-loudness-level contours; status code is 9599; successor is ISO/DIS 226 | ISO 226:2023 | ISO/NP 226; withdrawn / published date is 2003-08-21, recorded from its source on 2026-08-05.

- **Identifier:** ISO 226:2003 _(verified: appears in the quote below)_
- **Item title:** Acoustics — Normal equal-loudness-level contours _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/DIS 226 | ISO 226:2023 | ISO/NP 226
- **Withdrawn / published date:** 2003-08-21 _(verified: appears in the quote below)_

## What the source says

> 34222,IS,,ISO 226:2003,Acoustics — Normal equal-loudness-level contours,Acoustique — Lignes isosoniques normales,2003-08-21,2,['13.140'],ISO/TC 43,9599,[4100],"[81331,83117,56052]","['en','fr']",18,"<p>This International Standard specifies combinations of sound pressure levels and frequencies of pure continuous tones which are perceived as equally loud by human listeners. The specifications are based on the following conditions: the sound field in the absence of the listener consists of a free progressive plane wave; the source of sound is directly in front of the listener; the sound signals are pure tones; the sound pressure level is measured at the position where the centre of the listener

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).