GB/T 4963-2007: Acoustics -- Normal equal-loudness-level contours

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Scope

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:
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 GB/T 3240-1982.

Basic Data

Standard ID	GB/T 4963-2007 (GB/T4963-2007)
Description (Translated English)	Acoustics -- Normal equal-loudness-level contours
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	A59
Classification of International Standard	13.140
Word Count Estimation	22,233
Date of Issue	2007-11-14
Date of Implementation	2008-05-01
Older Standard (superseded by this standard)	GB/T 4963-1985
Adopted Standard	ISO 226-2003, IDT
Regulation (derived from)	China Announcement of Newly Approved National Standards No. 12 of 2007 (No. 112 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the listener feel such persistent loud pure tone frequency and sound pressure level relationships. Specified according to the following conditions: a) the absence of the listener a sound field formed by the free plane wave, b) in front of the listener a sound source, c) pure tone acoustic signal, d) sound pressure level at the listener 's head to the center of position measurement, but the listener is not present, e) binaural audiometry, f) listener for ages 18 to 25 years old, including normal ear. Data in Appendix A and Appendix B of the figure given in the form table. According to GB/T 3240-1982, commonly including 20Hz ~ 12500Hz frequency of 1/3 octave band center frequency.