We investigate the method to create the noise field of the underwater by using numerical simulation. The method has been applied to designing the optimal array gain of underwater acoustic array.

The acoustic energy flux detector based on vector hydrophone using counteractive technique of spacial acoustic energy flux, can obtain spatiotemporal gain proportion with time-bandwidth product.

How to reduce acoustic feedback and enhance the maximum usable gain of sound reinforcement system is one of the most important terms to evaluate the performance of the sound reinforcement system.