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20 TRG-TRC007-EN
notes
period two
Sound Perception and
Rating Methods
A-weighting is often used to define sound in outdoor environments. For
example, local sound ordinances typically regulate dBA levels at property lines.
Hearing-related safety standards, written by organizations such as the
Occupational Safety and Health Administration (OSHA), also commonly refer to
A-weighted sound-pressure levels when determining whether hearing
protection is required in a certain environment.
To avoid confusion, we recommend that A-weighting be applied only to octave-
band sound-pressure data, not to sound-power data. Also, A-weighting should
be limited to expressing a single-number descriptor. Displaying sound data in
all eight octave bands in terms of A-weighted sound pressures should be
avoided.
A–Weighting
I Used for outdoor sound
ordinances and indoor,
hearing-related safety
standards (OSHA)
I Use with sound pressure
data only, not sound power
I Express as a single number
descriptor only, not as
octave-band data
Figure 25