Acoustic Condition monitoring (CM) have many advantages comparing to other traditional CM methods (using vibration, speed measurement, temperature monitoring, .etc) It is reliable, cost effective and providing remote and contact less measurement. However, since acoustic signals have to propagate through the working environment before received by sensors, the performance of acoustic CM systems can be seriously influenced by environment factors, especially when they are working in industrial environment which normally has very strong background noise and reverberation. In this book, a number of...