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The study of sound is a branch of physics known as acoustics. Acoustics deals with the study of mechanical waves in gases, liquids, and solids, including topics such as vibration, sound, ultrasound, and infrasound. Acousticians, or experts in the science of sound, often possess a degree in acoustics, physics, or engineering, with a strong background in mathematics and science. Acoustics has applications in almost all aspects of modern society, including audio, noise control, music, medicine, architecture, industrial production, and warfare. The study of sound also includes the analysis of sound waves, which can be divided into three sections: audio, ultrasonic, and infrasonic.
| Characteristics | Values |
|---|---|
| Definition | The science of sound, including its production, transmission, and effects, including biological and psychological effects |
| Branch of | Physics |
| Study areas | Vibration, sound, ultrasound, infrasound |
| Applications | Music, medicine, architecture, industrial production, warfare, audio and noise control industries, archaeology |
| Sound range | 20 Hz to 20,000 Hz (audio range), 20,000 Hz and higher (ultrasonic range), below 20 Hz (infrasonic range) |
| Sound in physiology and psychology | Sensation of hearing, perception by the brain |
| Sound in physics | Vibrational energy, acoustic waves through a transmission medium such as gas, liquid, or solid |
| Archaeoacoustics | The archaeology of sound, testing the acoustic properties of prehistoric sites |
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What You'll Learn
Psychoacoustics
Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids, including sound. Psychoacoustics is a subfield of acoustics that involves the scientific study of how humans perceive sound and the psychological responses associated with it. It is an interdisciplinary field that combines psychology, acoustics, electronic engineering, physics, biology, physiology, and computer science.
One of the key applications of psychoacoustics is in audio compression. The psychoacoustic model enables high-quality lossy signal compression by identifying parts of a digital audio signal that can be removed or reproduced with reduced quality without significantly compromising the perceived sound quality. This results in smaller file sizes for music and other audio formats, such as MP3, Opus, and Dolby Digital, with minimal loss in audio quality.
Furthermore, psychoacoustics has been applied in sonification, making multiple data dimensions audible and easily interpretable. This has led to advancements in drone flying, image-guided surgery, and computer games, where auditory guidance enhances the user experience. In music, artists and musicians use psychoacoustic principles to create new auditory experiences by manipulating the frequencies of instruments.
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Archaeoacoustics
Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids, including topics such as vibration, sound, ultrasound, and infrasound. An expert in the science of sound is called an acoustician.
Archaeoacoustic studies can be grouped into two categories: the study of artefacts (e.g., musical instruments) and places (buildings or sites). For archaeological or historical sites that still exist, measurement methods from architectural acoustics can be used to characterise the behaviour of the site's acoustic field. When sites have been altered from their original state, a mixed-methodology approach can be used, combining acoustic measurements with virtual reconstructions and simulations.
Recent developments in digital modelling, virtual reality, and augmented reality have contributed significantly to the increasing research activity in archaeoacoustics. For example, 3D virtual reality technology was applied to create integrated visual and acoustical restorations of ancient Greek and Roman theatres. Archaeoacoustics also employs scientific methodologies and integrates information from site archaeology to test historical claims and offer empirical evidence for sound dynamics.
Some interesting findings from archaeoacoustics include the Kukulkan pyramid in Chichen Itza, Mexico, where the geometry of the stone steps creates a sound reflection from a hand clap that mimics the chirping call of a local bird. Another example is the identification of acoustical resonances in Neolithic structures, including some stone chambers with resonances around 110 Hz, which coincides with the fundamental of the male voice.
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Architectural acoustics
Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids, including topics such as vibration, sound, ultrasound, and infrasound. The study of acoustics revolves around the generation, propagation, and reception of mechanical waves and vibrations.
For example, the typical sound paths that are considered in architectural acoustics include ceilings, room partitions, acoustic ceiling panels, doors, windows, flanking, ducting, and other penetrations. To minimize mutual disturbances due to noise in adjacent apartments, a suitable party wall design can be implemented.
The choice of materials is critical in architectural acoustics. Materials with high sound absorption, such as fabric-covered panels, perforated metal, and stone wool ceiling tiles, are effective at reducing reverberation and echoes in a room. On the other hand, materials with high sound transmission loss, such as concrete, are better at blocking sound transfer between spaces.
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Ultrasound for medical imaging
Acoustics, the study of sound, is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids, including topics such as vibration and sound. It also covers the production, transmission, and effects of sound. Acoustic signals are often sampled over time and presented in forms such as octave bands or time-frequency plots to better understand the acoustic phenomenon. The spectrum can be divided into three sections: audio, ultrasonic, and infrasonic. The ultrasonic range refers to very high frequencies of 20,000 Hz and higher, which have shorter wavelengths, allowing better resolution in imaging technologies.
Ultrasound has several advantages over other imaging methods, including real-time imaging, portability, and lower cost. However, it has limitations, such as challenges in imaging structures obscured by bone or air and the need for skilled operators. Additionally, ultrasound waves can heat tissues and produce small gas pockets in body fluids or tissues, although the long-term consequences of these effects are unknown. Due to potential risks, organizations recommend using ultrasound only for medical purposes and avoiding casual use, especially during pregnancy.
Ultrasound is also used therapeutically, for example, to guide interventional procedures such as biopsies or fluid drainage. Researchers are exploring new applications, such as using focused ultrasound to solidify ink injected into the body for 3D printing of biocompatible structures, which could make surgical procedures less invasive. Ultrasound imaging continues to be a valuable tool for physicians in evaluating, diagnosing, and treating medical conditions.
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Noise control
Acoustics, the study of sound, involves the study of mechanical waves in gases, liquids, and solids, including topics such as vibration, sound, ultrasound, and infrasound. The science of sound also includes its production, transmission, and effects, including biological and psychological effects.
In offices, noise can impact work performance and employee health. Acoustic baffles and soundproofing products can be used to reduce noise and create a more productive environment.
For gyms, echoes can be detrimental to the function of the space, and acoustic treatments can help manage this issue.
Companies like Kinetics Noise Control offer a range of products and solutions to control airborne noise, isolate structure-borne vibrations, enhance room acoustics, and create quiet spaces. Their offerings include engineering services such as pipe stress analysis, riser support design, and seismic and wind analysis.
Archaeoacoustics, or the archaeology of sound, is a unique field that utilizes sound to understand the past. Acoustic properties are studied in prehistoric sites, including caves, to explore ritualistic purposes and echolocation.
In summary, noise control is a critical aspect of acoustics, with applications in various industries and settings. It involves utilizing soundproofing, noise reduction techniques, and specialized products to create healthier and more functional spaces while also adhering to national policies and standards that protect public health and welfare.
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Frequently asked questions
The study of sound is called acoustics.
Acoustics is an interdisciplinary science that deals with the study of mechanical waves in gases, liquids, and solids, including vibration, sound, ultrasound, and infrasound.
An acoustician is a scientist who works in the field of acoustics. They usually have a Bachelor's degree or higher qualification, often in acoustics, physics, or engineering. Acousticians work in research and development, advancing our knowledge of the perception of speech, music, and noise, as well as how sound is affected as it moves through different environments.
Acoustics has applications in almost all aspects of modern society, including audio and
