Historical
ANSI/ASA S1.6-1984 (R2011)
Preferred Frequencies, Frequency Levels, and Band Numbers for Acoustical Measurements
This standard defines the preferred frequencies, or nominal band-center frequencies to be used for acoustical measurements. Frequency levels or band numbers are associated with these sets of frequencies and the preferred frequencies are rounded values obtained from those for which the corresponding frequency levels or band numbers are integers.
Content Provider
Acoustical Society of America [asa]