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ASIAEx 2001

Sounds from the South China Sea

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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.

Last updated: June 23, 2011

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