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Recall that the decibel scale
is a reference-based scale. For the dB SPL scale the reference point is
a specific sound pressure measurement (i.e., 20 microPascals ). To account
for specific characteristics of the human auditory system (which will be
reviewed shortly), we will use a decibel scale called the Hearing Level,
or HL, scale to describe pure tone threshold levels. The HL scale uses average
normal hearing levels as its reference point. If your having problems with
the concept of reference-based scales and you want a review, click
here. |
