Acoustic Time Reversing Mirror(TRM) can be implemented with an array of transducers that listens to a remote sound source and then transmits a time reversed version of what was heard.

The acoustic holography technique for sound source identification and position by the method of continuously scanning improves the previous acoustic holography experiment.

After a white noise signal has been taken as the input of a standard sound source, a static acoustic test is conducted for a prototype silencer without air flow and at the normal temperature.