Analysis and Ranking of the Acoustic Disturbance Potential of ...

Report No. 6945
BBN Systems and Technologies Corporation
Fs l Fs Fsh
I
---
Lr3
----
- flax. Level above Threshold
m >
m
-J
73
c
1
0
Ln
Ss-------
I
I
Fr l Fr Frh
Frequency .--
I
I
I
Figure 5.2.
Diagram of Source Spectrum and Hearing Characteristic Showing SER
Model Parameters.
Fr - The frequency where the hearing sensitivity is highest.
Sensitivity - The level of a pure tone which is detectable within the
guidelines of established testing procedure.
Sm - The lowest detectable pure tone level (Highest
sensitivity level).
Ss - The pure tone sensitivity level for a specific species
at the center frequency with the highest 1/3 octave band
level above the hearing threshold at the same frequency.
BWeff - The audible bandwidth (see Fig. 5.2)
Ref SER - A reference value with D, = 1 /km2, to permit comparison
of species density independent SER values.
Area SER - The rating value when Ds is set to an appropriate value
for a specific species.
SER-SNC1 - A measure of the potential acoustic influence of source
on a species, independent of source density.