Frequency group

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A frequency band, the bandwidth of which is the maximum bandwidth of a sound for which its threshold of audibility (in the presence of a uniform masking noise) and its equivalent loudness remain independent of the spectral distribution of sound intensity within the frequency group.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM