The measurement and analysis of sound waves traveling in air, solids and liquids is important to a number of industries involved in production test, machine/engine performance and process control. Signals detected by sensors such as microphones and accelerators can reveal critical information about an objects behavior and action. Sound waves can also be used for acoustic location with active techniques employing sound generation and studying echo responses while passive methods listen for generated sounds or vibrations and then endeavor to determine the direction and location of the source. Perhaps the most famous acoustic location method is SONAR where hydrophones are be used to monitor waveforms traveling in water. However, acoustic location is also employed in other mediums and plays a key role in material science and geology.