SS-ISO-226 Acoustics - Normal equal-loudness-level contours (ISO 226:2003, IDT)

Show Complete Document History

Document Center Inc. is an authorized dealer of SIS standards.
The following bibliographic material is provided to assist you with your purchasing decision:

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 then following conditions: a) the sound field in the absence of the listener consists of a free progressive plane wave; b) the source of sound is directly in front of the listener; c) the sound signals are pure tones; d) the sound pressure level is measured at the position where the centre of the listener's head would be, but in the absence of the listener; e) listening is binaural; f) the listeners are otologically normal persons in the age range from 18 years to 25 years inclusive. The data are given in graphical form in Annex A and in numerical form in Annex B for the preferred frequencies in the one-third-octave series from 20 Hz to 12 500 Hz, inclusive, in accordance with ISO 266.

To find similar documents by classification:

13.140 (Noise with respect to human beings Including audiometry Hearing protectors, see 13.340.20 Acoustics and acoustic measurements, see 17.140)

This document comes with our free Notification Service, good for the life of the document.

This document is available in either Paper or PDF format.




Want this as a site license?

Designation Name

SS-ISO 226:2004

Revision Level




Publication Date

April 29, 2004



Page Count


International Equivalent

ISO 226:2003(IDT)