UD-4
UD-4 was a discrete four-channel quadraphonic sound system for phonograph records introduced by Nippon Columbia (Denon) in 1974. This…
Ultra HD Blu-ray
Ultra HD Blu-ray (4K Ultra HD, UHD-BD, or 4K Blu-ray) is a digital optical disc data storage format that is an enhanced variant of Blu-ray.
Ultra Stereo
Ultra Stereo, stylized as ULTRA★STEREO, is a cinema sound system that was developed in 1984 by chief engineer Jack Cashin.
Ultrasonic antifouling
Ultrasonic antifouling is a technology that uses high frequency sound (ultrasound) to prevent or reduce biofouling on underwater…
Ultrasonic atomization
Ultrasonic atomization is a process in which a liquid, in contact with a surface vibrating at ultrasonic frequencies, forms standing…
Ultrasonic cleaning
Ultrasonic cleaning is a process that uses ultrasound (usually from 20 – 40 kHz) to agitate a fluid, with a cleaning effect.
Ultrasonic consolidation
Ultrasonic Consolidation (UC) or Ultrasonic Additive Manufacturing (UAM) is a low temperature additive manufacturing or 3D printing…
Ultrasonic flow meter
An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow.
Ultrasonic hearing
Ultrasonic hearing is a recognised auditory effect which allows humans to perceive sounds of a much higher frequency than would ordinarily…
Ultrasonic horn
An ultrasonic horn (also known as acoustic horn, sonotrode, acoustic waveguide, ultrasonic probe) is a tapering metal bar commonly used…
Ultrasonic soldering
Ultrasonic soldering (U/S soldering) is a flux-less soldering process that uses ultrasonic energy, without the need for chemicals to…
Ultrasonic testing
Ultrasonic testing (UT) is a family of non-destructive testing techniques based on the propagation of ultrasonic waves in the object or…
Ultrasonic transducer
Ultrasonic transducers and ultrasonic sensors are devices that generate or sense ultrasound energy. They can be divided into three broad…
Ultrasonic vocalization
Ultrasonic vocalizations (USVs) occur at frequencies ranging from approximately 20–100 kHz. They are emitted by animals such as bats and…
Ultrasonic welding
Ultrasonic welding is an industrial process whereby high-frequency ultrasonic acoustic vibrations are locally applied to work pieces being…
Ultrasonic welding of thermoplastics
Ultrasonic welding is a method of joining thermoplastic components by heating and subsequent melting of surfaces in contact. Mechanical…
Ultrasound
Ultrasound is sound with frequencies greater than 20 kilohertz. This frequency is the approximate upper audible limit of human hearing in…
Ultrasound attenuation spectroscopy
Ultrasound attenuation spectroscopy is a method for characterizing properties of fluids and dispersed particles. It is also known as…
Ultrasound avoidance
Ultrasound avoidance is an escape or avoidance reflex displayed by certain animal species that are preyed upon by echolocating predators.
Ultrasound computer tomography
Ultrasound computer tomography (USCT), sometimes also Ultrasound computed tomography, Ultrasound computerized tomography or just…
Ultrasound Localization Microscopy
Ultrasound Localization Microscopy (ULM) is an advanced ultrasound technique used for animal and human imaging. By localizing…
Ultrasound research interface
An ultrasound research interface (URI) is a software tool loaded onto a diagnostic clinical ultrasound device which provides functionality…
Ultrasound transmission tomography
Ultrasound transmission tomography (UTT) is a form of tomography involving ultrasound.
Ultrasound-enhanced systemic thrombolysis
Ultrasound enhanced systemic thrombolysis (UEST), also known as sonothrombolysis, is a method that uses ultrasound waves to mechanically…
Ultrasound-switchable fluorescence imaging
Ultrasound-switchable fluorescence (USF) imaging is a deep optics imaging technique. In last few decades, fluorescence microscopy has…
Ultrasound-triggered drug delivery using stimuli-responsive hydrogels
Ultrasound-triggered drug delivery using stimuli-responsive hydrogels refers to the process of using ultrasound energy for inducing drug…
Undertone series
In music, the undertone series or subharmonic series is a sequence of notes that results from inverting the intervals of the overtone…
Underwater acoustic communication
Underwater acoustic communication is a technique of sending and receiving messages in water. There are several ways of employing such…
Underwater acoustics
Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the…
Underwater survey
An underwater survey is a survey performed in an underwater environment or conducted remotely on an underwater object or region. Surveys…
Uni-Vibe
The Uni-Vibe, also marketed as the Jax Vibra-Chorus, is a footpedal-operated phaser, or phase shifter, for creating chorus and vibrato…
United Kingdom patent 394325
The United Kingdom patent 394325 'Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems' is a…
Universal neonatal hearing screening
Universal neonatal hearing screening (UNHS), which is part of early hearing detection and intervention (EHDI) programmes, refer to those…
Unreleased Bitterness
"Unreleased Bitterness" is a song by English doom metal band My Dying Bride. The track contained in this release is an early rehearsal…
Unsilent Night
Unsilent Night is a musical composition and participatory performance art piece by American composer Phil Kline which, since its creation…
Unusual types of gramophone records
The overwhelming majority of records manufactured have been of certain sizes (7, 10, or 12 inches), playback speeds (331⁄3, 45, or 78…
Upsweep
The Upsweep is a sound detected by the U.S. National Oceanic and Atmospheric Administration's (NOAA) equatorial autonomous hydrophone…
Usher syndrome
Usher syndrome, also known as Hallgren syndrome, Usher–Hallgren syndrome, retinitis pigmentosa–dysacusis syndrome or dystrophia retinae…
USHUS (sonar)
USHUS is an Integrated Submarine Sonar System developed by the Naval Physical and Oceanographic Laboratory (NPOL) of the Defence Research…