Acoustical engineering is the discipline that studies sound and vibration. It is the application of the science of sound and vibration in technology. Acoustical engineers are concerned with the design, analysis and control of sound. An example of a typical goal of an acoustical engineer is to reduce unwanted noise. This is referred to as noise control. The principles are to implement technology and design in various ways to control the unwanted noise.
Acoustical engineers can do work in other areas aside from noise control. These areas can include ultrasound in medicine and programming of digital sound. They can design concert hall’s acoustics to enhance the sound of an orchestra and specify a railway station’s sound system so that the announcements are intelligible.
There are many sub disciplines in acoustical engineering. These include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics, electroacoustics, environmental noise, musical acoustics, noise control, psychoacoustics, speech, ultrasonics, underwater acoustics and vibration and dynamics. These all look at the way sound interacts with its surroundings. The basic sound wave behaviors include absorption, reverberation, diffraction and refraction.