Acoustics

In chemistry, the study of sonochemistry is concerned with understanding the effect of ultrasound in forming acoustic cavitation in liquids, resulting in the initiation or enhancement of the chemical activity in the solution.

The auricle or auricula is the visible part of the ear that resides outside of the head.

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

Musica universalis (literally universal music), also called Music of the spheres or Harmony of the Spheres, is an ancient philosophical concept that regards proportions in the movements of celestial bodies—the Sun, Moon, and planets—as a form of musica (the Medieval Latin term for music).

Hearing, auditory perception, or audition is the ability to perceive sound by detecting vibrations, changes in the pressure of the surrounding medium through time, through an organ such as the ear.

In audio signal processing and acoustics, echo is a reflection of sound that arrives at the listener with a delay after the direct sound.

Reverberation, in psychoacoustics and acoustics, is the persistence of sound after a sound is produced.

Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound.

Absolute pitch (AP), widely referred to as perfect pitch, is a rare auditory phenomenon characterized by the ability of a person to identify or re-create a given musical note without the benefit of a reference tone.

Stereophonic sound or, more commonly, stereo, is a method of sound reproduction that creates an illusion of multi-directional audible perspective.

A resonance chamber uses resonance to amplify sound.

Granular synthesis is a basic sound synthesis method that operates on the microsound time scale.

The phonautograph is the earliest known device for recording sound.

Acoustic waves are a type of longitudinal waves that propagate by means of adiabatic compression and decompression.

In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies.

Bioacoustics is a cross-disciplinary science that combines biology and acoustics.

The soundscape is the component of the acoustic environment that can be perceived by humans.

The middle ear is the portion of the ear internal to the eardrum, and external to the oval window of the inner ear.

The outer ear is the external portion of the ear, which consists of the auricle (also pinna) and the ear canal.

JASCO Applied Sciences is a group of international companies that provides services and manufactures equipment to measure underwater sound.

Nonlinear acoustics (NLA) is a branch of physics and acoustics dealing with sound waves of sufficiently large amplitudes.

Atmospheric diffraction is manifested in the following principal ways: * Optical atmospheric diffraction * Radio wave diffraction is the scattering of radio frequency or lower frequencies from the Earth's ionosphere, resulting in the ability to achieve greater distance radio broadcasting.

Acoustic location is the science of using sound to determine the distance and direction of its source or reflector.

The field of underwater acoustics is closely related to a number of other fields of acoustic study, including sonar, transduction, acoustic signal processing, acoustical oceanography, bioacoustics, and physical acoustics.

Pre-echo, sometimes called a forward echo, (not to be confused with reverse echo) is a digital audio compression artifact where a sound is heard before it occurs (hence the name).

xeno-canto is a citizen science project in which volunteers record, upload and annotate recordings of birdsong and bird calls.

The precedence effect or law of the first wavefront is a binaural psychoacoustic effect.

A whistling kettle is a kettle fitted with a device that emits an audible whistle when the water in the kettle starts to boil.

Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave.

The term harmonic in its strictest sense describes any member of the harmonic series.

Frequency is the number of occurrences of a repeating event per unit time.

An audio frequency (abbreviation: AF) or audible frequency is characterized as a periodic vibration whose frequency is audible to the average human.

Room acoustics describes how sound behaves in an enclosed space.

Salford Acoustics offers Acoustics and Audio Engineering Courses, undertakes public and industrial research in acoustics, carries out commercial testing, and undertakes activities to engage the public in acoustic science and engineering.

Pulse-code modulation (PCM) is a method used to digitally represent sampled analog signals.

Diffuse field acoustic testing is the testing of the mechanical resistance of a spacecraft to the acoustic pressures during launch.

Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching the observer.

Sound energy density or sound density is the sound energy per unit volume.

The purpose of the International Commission for Acoustics (ICA) is to promote international development and collaboration in all fields of acoustics including research, development, education, and standardisation.

Auditory masking occurs when the perception of one sound is affected by the presence of another sound.

Bruitparif is a non-profit environmental organization responsible for monitoring the environmental noise in the Paris agglomeration.

In acoustics, the dummy head recording (also known as artificial head, Kunstkopf or Head and Torso Simulator) is a method of recording used to generate binaural recordings.

The decibel (dB) is a logarithmic unit used to express the ratio of two values of a physical quantity.

Smaart is a software suite of audio and acoustic measurement tools, a software application for the analysis portion of acoustical measurements and instrumentation.