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The red arrow above points to the time of this audio clip which has been amplified to
a level 5000 times higher than what is heard at the receiver. The sounds of the 300Hz and
500Hz sweeper
sources are obvious. A J-15-3 ship-towed source was also employed at this time. It
transmits frequency sweeps from 50 to 200Hz amd 550 to 600Hz. Near the end of the
audio clip, the
400Hz and 224Hz phase encoded
sources will start. The spectrogram above clearly shows us when the sources were
functioning. The continuous higher amplitude noise at just below 50Hz is due to
shipping.
Please note that all the acoustic noise we put in the water
(even off the coast of China) is under the U.S. legal limit determined by
the government regulations and that our routine procedure is to not
place any acoustic generators
near marine mammal migratory, breeding, or feeding areas.
