Long Range Acoustic Device:
http://edition.cnn.com/2004/TECH/ptech/03/03/sonic.weapon.ap/
Also in use in New York:
Edited: 2 more pics
A short info: http://en.wikipedia.org/wiki/Long_range_acoustic_device
A single page report on German experimentation with use of sound waves as a weapon, from the Intelligence Bulletin, May 1946: