Acoustics is a branch of physics and is the study of sound, mechanical waves in gases, liquids, and solids. A scientist who works in the field of acoustics is an acoustician. The application of acoustics in technology is called acoustical engineering. There is often much overlap and interaction between the interests of acousticians and acoustical engineers. "... acoustics is characterized by its reliance on combinations of physical principles drawn from other sources; and that the primary task of modern physical acoustic ...

Including:

Acoustics - Sound pressure level SPL Acoustics - Measurement methods Acoustics - Reverberation and anechoic rooms Acoustics - Helmholtz resonator Acoustics - Rectangular boxes

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The acoustic impedance Z of an acoustic component (in Pa·s/m) is the ratio of sound pressure p to particle velocity v at a transition with a previous component: p = sound pressure in N/m2 = Pa = pascal v = particle velocity in m/s I = sound intensity in W/m2 ...

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Acoustic impedance, Acoustic impedance - Characteristic impedance, Acoustic impedance - Impedance of acoustic components

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The acoustics of vowels are fairly well-understood. The different vowel qualities are realized in acoustic analyses of vowels by the relative values of the formants, acoustic resonances of the vocal tract which show up as dark bands on a spectrogram. The vocal tract acts as a resonant cavity, and the position of the jaw, lips, and tongue affect the parameters of the resonant cavity, resulting in different formant values. The acoustics of vowels can be visualized using spectrograms, which display the acoustic energy at each frequen ...

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Vowel, Vowel - Articulation, Vowel - Height, Vowel - Backness, Vowel - Roundedness, Vowel - Nasalization, Vowel - Phonation, Vowel - Tongue root retraction, Vowel - Secondary narrowings in the vocal tract, Vowel - Tenseness/checked vowels vs. free vowels, Vowel - Acoustics, Vowel - Prosody and intonation, Vowel - Monophthongs diphthongs triphthongs, Vowel - Vowels in languages, Vowel - Vowel systems, Vowel - Written vowels, Vowel - Written vowels in writing systems

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The amplitude of a sound wave is usually characterized by its sound pressure. In a normal working environment, a very wide range of pressures can occur and it is therefore a convention that sound pressure is measured on a logarithmic scale using the decibel. If p is the rms sound pressure amplitude then the sound pressure level (SPL) is defined as 20 times the logarithm of the ratio of the pressure to some reference pressure. Sound pressure level SPL ...

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Acoustics, Acoustics - Sound pressure level SPL, Acoustics - Measurement methods, Acoustics - Reverberation and anechoic rooms, Acoustics - Helmholtz resonator, Acoustics - Rectangular boxes

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Architectural acoustics is the science of controlling quality of sound in buildings. The main concerns of architectural acoustics are: Building's Noise Insulation Envelope Inter-space noise control Building's Internal Acoustics ACMV Noise control in Buildings (also HVAC (Heating, Ventilation, Air Conditioning)) Building's Noise Insulation Envelope - the science of limiting and/or controlling noise transmission from building exterior to interior and vice versa. The main noise paths are roofs, eaves, walls, windows, door and ...

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The acoustic impedance Z (or sound impedance) is the ratio of sound pressure p to particle velocity v in a medium or acoustic component. Distinction has to be made between: the characteristic acoustic impedance Z0 of a medium, usually air (compare with characteristic impedance in transmission lines). the impedance Z of an acoustic component, like a wave conductor, a resonance chamber, a muffler or ...

Including:

Acoustic impedance - Characteristic impedance Acoustic impedance - Impedance of acoustic components

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Absorption refers to the absorption of sound waves by a material. The Absorption is the "missing piece", when comparing the total reflected and transmitted energy with the incident energy. It is the property of a material that changes acoustic energy into usually heat energy. A material or surface that absorbs sound waves does not reflect them. Absorption of a given material is frequency dependant as well as being affected by the size, shape, location, and mounti ...

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The acoustic bass guitar is an acoustic string instrument based on the configuration of the electric bass pioneered by Leo Fender's electric Fender Precision Bass. Acoustic bass guitar - History. The first modern acoustic bass guitar was developed in the early 1970s by Ernie Ball of San Luis Obispo, California. Ball's aim was to provide bass guitarists with a more acoustic-sounding instrument that would match better with the sound of acoustic guitars. About his invention, Ball stated: "I ...

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Acoustic bass guitar - History Acoustic bass guitar - Construction and tuning Acoustic bass guitar - Manufacturers Acoustic bass guitar - Mexican acoustic bass guitars

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Acoustic neuroma (or Vestibular Schwannoma) is a benign tumor of the the myelin forming cells called "Schwann cells" of the 8th cranial nerve, known as the acoustic nerve, (or more properly the vestibulocochlear nerve) just after it has left the brainstem, in the pontine angle; also at the point where the peripheral part of the nerve meets the brain part of the nerve called "Hensen's node". Acoustic neuroma - Assessment. Associated symptoms are unilateral sensorineural hearing loss/deafness and verti ...

Including:

Acoustic neuroma - Assessment Acoustic neuroma - Treatment
Acoustic neuroma - Surgery Acoustic neuroma - Radiation Therapy Acoustic neuroma - External Links

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Resonance is an important consideration for instrument builders as most acoustic instruments use resonators, such as the strings and body of a violin, the length of tube in a flute, and the shape of a drum membrane. Acoustic resonance - Resonance of a string. Lute (harp, guitar, piano, violin etc.) strings have a fundamental resonant frequency directly related to the length and tension of the string. The wavelength that will create the first resonance on the string is equal to twice the length of the string. This frequency is related to the speed v of a wave trave ...

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Acoustic resonance - Resonance of a string Acoustic resonance - Resonance of a tube of air

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Under general relativity, absolute gravitational horizons are sharply defined (at r=2M for a spherical black hole), and once defined, this limit in the Schwarzchild metric is inviolable: events enclosed by the event horizon of a black hole cannot modify the external properties of the object, because this would require signals to move outward through the horizon, which is forbidden. With an acoustic horizon (a.k.a. "sonic horizon"), this ordered set of definitions breaks down: events behind an acoustic horizon can ...

See also:

Acoustic metric, Acoustic metric - Unusual properties of an acoustic metric, Acoustic metric - Acoustic horizons, Acoustic metric - Acoustic metrics and quantum gravity, Acoustic metric - A simple fluid example

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In acoustics, a beat is an interference between two sounds of slightly different frequencies, perceived as periodic variations in volume whose rate is the difference between the two frequencies. For example, let's take a guitar (an electric one, so that the sound lasts longer), and pick for example the two treblest strings, B and E. Our ear hears the two notes separately, and realizes that the total sound is even pleasant. Suppose now we start to tighten the B string more and more, to raise its frequency up to the E. Sup ...

Including:

Beat acoustics - Binaural beats Beat acoustics - Example

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Acoustic theory is the field relating to mathematical description of sound waves. It is derived from fluid dynamics. See acoustics for the engineering approach. The propagation of sound waves in air can be modeled by an equation of motion (conservation of momentum) and an equation of continuity (conservation of mass). With some simplifications, in particular constant density, they c ...

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The acoustic reflex (or stapedius reflex) is an involuntary muscle contraction that occurs in the middle ear of mammals in response to high-intensity sound stimuli. When presented with a high-intensity sound stimulus, the stapedius and tensor tympani muscles of the ossicles contract. The stapedius pulls the stapes (stirrup) of the middle ear away from the oval window of the cochlea and the tensor tympani muscle pulls the malleus (hammer) away from ear drum. The reflex decreases the transmission of vibrational energy to t ...

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Acoustic cryptanalysis is a side channel attack which exploits sounds, audible or not, produced during a computation or input-output operation. In 2004, Dmitri Asonov and Rakesh Agrawal of the IBM Almaden Research Center announced that computer keyboards and keypads used on telephones and automated teller machines (ATMs) are vulnerable to attacks based on differentiating the sound produced by different keys. Their attack employed a neural network to recognize the key being pressed. By analyzing recorded sounds, they were able to recov ...

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Transient means passing with time. For example, a damped oscillator needs some time after a temporary disturbance to reach the equilibrium again, and after a permanent change in system variables, to reach the new equilibrium. Transient - In Acoustics in analogue and Digital Signal Processing of audio signals. A transient is a short-duration signal that represents a nonharmonic attack phase of a musical sound or spoken word. It contains a high degree of nonperiodic components and a higher magnitude of high f ...

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Transient - In Acoustics in analogue and Digital Signal Processing of audio signals Transient - In Chemical engineering Transient - In Civil engineering Transient - In Electrical engineering Transient - In Computer Science

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Audio engineering is a part of audio science dealing with the recording and reproduction of sound through mechanical and electronic means. The field of audio engineering draws on many disciplines, including electrical engineering, acoustics, psychoacoustics, and music. Unlike acoustical engineering, audio engineering generally does not deal with noise control or acoustical design. Much of ...

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Audio engineering - Practicioners

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Synthesis (from the Greek words syn = plus and thesis = position) is commonly understood to be an integration of two or more pre-existing elements which results in a new creation. Synthesis - Philosophical synthesis. The term is broad in meaning and can apply to physical, ideological, and/or phenomenological entities. In dialectics, synthesis is the final result of attempts to reconcile the inherent contradiction between thesis and antithesis. Along with the similar concept of integration, syn ...

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Synthesis - Philosophical synthesis Synthesis - Chemical synthesis Synthesis - Synthesis in electronics and acoustics

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A clap is the sound made by striking together two flat surfaces, as in the body parts of humans or animals. Humans clap with the palms of their hands, often in a constant drone to express approval (see applause), but also in rhythm to match sounds in music and dance. Seals are among the animals that clap. There is a well-known koan that involves, superficially, consideration of the act of clap ...

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Clapping - Pedagogical applications Clapping - Acoustics applications Clapping - Medical applications

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