Acoustical engineering

Acoustical engineering is a special kind of engineering that deals with sound and vibration. It uses the science of acoustics, which is the study of sound and vibration, to create new technologies. People who work in this field, called acoustical engineers, help design, analyze, and control sound in many different ways.

One important goal of acoustical engineering is to reduce unwanted noise, known as noise control. Too much noise can hurt both animals and people, make it hard for students to learn in school, and even lead to hearing problems. Engineers use many clever methods to control noise, like changing how sound sources are made, building noise barriers, using materials that absorb sound, and even creating special zones to buffer noise. Sometimes people also use devices like earmuffs or earplugs to protect their ears.

Besides reducing noise, acoustical engineering also helps us use sound in useful ways. For example, it includes using ultrasound in medicine to see inside the body, creating music with digital synthesizers, designing concert halls so orchestras sound their best, and making sure that announcements in places like railway stations are easy to understand, or intelligible. Sound is all around us, and acoustical engineers help shape how we experience it every day.

Acoustic engineer (professional)

Acoustic engineers study sound and vibration. They usually have a bachelor's degree or higher in acoustics, physics, or engineering. They may work in many areas, such as designing sound systems for cars, studying how people react to sounds in cities or homes, and creating software for audio mixing. Some acoustic engineers also research sound for scientific purposes. In many countries, engineers can become certified professionals after meeting certain requirements and earning the title of Chartered Engineer.

Acoustic engineers might specialize in areas like architectural acoustics, environmental noise, or vibration control. They can work in many industries, designing loudspeakers and microphones for devices like mobile phones.

Subdisciplines

The listed subdisciplines are loosely based on the PACS (Physics and Astronomy Classification Scheme) coding used by the Acoustical Society of America).

Aeroacoustics is the study of how noise is created by moving air, such as through turbulence. It helps us understand noise from aircraft and wind turbines, as well as how wind instruments create sound.

Audio signal processing changes audio signals using electronic methods. This can improve sound, remove unwanted noise, compress files for sharing, or help identify music. Audio engineers create these processing methods.

Architectural acoustics focuses on making good sound inside buildings. This can mean clear speech in a theatre, great music in a concert hall, or quiet spaces for offices and homes.

Bioacoustics studies how animals use and hear sound. This includes how animals communicate with sound, how they produce it, and how human-made noise affects them.

Electroacoustics designs devices like microphones, loudspeakers, and sound systems. It is important for portable devices such as mobile phones, portable media players, and tablet computers.

Environmental noise control looks at reducing noise from traffic, aircraft, and machines. Engineers work to measure noise, decide acceptable levels, and find ways to control it. They also study positive uses of sound and keeping quiet spaces.

Musical acoustics explores the science of music. This includes how musical instruments work, how we sing, and how we understand music.

Noise control uses methods to reduce unwanted noise. This can mean changing the source of noise, using barriers, or protecting ears. It also includes making products sound better, like car doors closing quietly.

Psychoacoustics studies how people react to sound. It helps explain why some noises are annoying and others are pleasant. This knowledge is used in designing audio systems that people enjoy.

Speech studies how we produce, process, and understand speech. This includes how speech works physically and mentally, and how machines can recognize and create speech.

Ultrasonics deals with very high-frequency sounds that people cannot hear. Uses include medical imaging, studying chemicals, testing materials, and underwater exploration.

Underwater acoustics studies sound in water. It looks at natural and human-made sounds, how they travel, and how sea animals perceive them. This is used in technologies like sonar to detect objects underwater and to monitor sea conditions.

Vibration and dynamics studies how machines and structures move and interact with their surroundings. This includes measuring and controlling vibrations from railways, protecting buildings from earthquakes, and reducing noise in recording studios.

Fundamental science

Sound behaves in interesting ways when it travels through the air or other materials. Some important ways sound acts include how it gets softer when it hits a surface, how it keeps echoing in a room, and how it bends around corners or changes direction. These ideas help engineers design things like quiet rooms, good speaker systems, and noise-reducing materials. By studying how sound works, acoustical engineers can control noise and improve how we hear sounds in many places.

Main article: absorption
Main articles: reverberation, diffraction, refraction

Associations

Many groups bring together people who study and work with sound. Some of these groups include the Acoustical Society of America Technical Committee on Engineering Acoustics, the Audio Engineering Society, the Australian Acoustical Society, the Canadian Acoustical Association, the Institute of Acoustics, Chinese Academy of Sciences, the Institute of Acoustics (United Kingdom), and the Danish Sound Cluster (Denmark). These groups help scientists and engineers share ideas and learn from each other.