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BEIJING, Jan. 14 (Xinhua) -- China will continue to tackle noise pollution and improve the country acoustic environment during the 14th Five-Year Plan period (2

Kilohertz. >> tom, what else could be making the noise that was detected for two-plus hours two days ago? what else could it have been, if not the black boxes? >> well, there's -- as i said, there's a lot of things that are in the marine space that emit, that put acoustic energy into the water at 33 kilohertz. probably the most common is a thing called a single beam echo sound. it's used on ships to find the bottom. it is able to detect the bottom of the ocean very deep in the ocean. to do that, it's putting as much as 1,000 types more energy or it's 1,000 times louder than the pinger is. so e...