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. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an acoustical engineer. The application of acoustics is present in almost all aspects of modern society with the most obvious being the audio and noise control industries.
A weighting filter is used to emphasize or suppress some aspects of a phenomenon compared to others, for measurement or other purposes.
A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound. Most hydrophones are based on a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a sound wave.
Romney Marsh is a sparsely populated wetland area in the counties of Kent and East Sussex in the south-east of England. It covers about 100 square miles (260 km2). The Marsh has been in use for centuries, though its inhabitants commonly suffered from malaria until the 18th century. Due to its location, geography and isolation, it was a smuggler's paradise between the 1600s and 1800s. The area has long been used for sheep pasture: Romney Marsh sheep are considered one of the most successful and important sheep breeds. Criss-crossed with numerous waterways, and with some areas lying below sea level, the Marsh has over time sustained a gradual level of reclamation, both through natural causes and by human intervention.
Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in commercial airline headsets with the technology becoming available in the late 1980s. The technology is also used in road vehicles, mobile telephones, earbuds, and headphones.
Dungeness is a headland on the coast of Kent, England, formed largely of a shingle beach in the form of a cuspate foreland. It shelters a large area of low-lying land, Romney Marsh. Dungeness spans Dungeness Nuclear Power Station, the hamlet of Dungeness, and an ecological site at the same location. It lies within the civil parish of Lydd.
A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in enclosures all controlled by a mixing console that makes live or pre-recorded sounds louder and may also distribute those sounds to a larger or more distant audience. In many situations, a sound reinforcement system is also used to enhance or alter the sound of the sources on the stage, typically by using electronic effects, such as reverb, as opposed to simply amplifying the sources unaltered.
An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves. Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor sporting events. Pairs of large parabolic acoustic mirrors which function as "whisper galleries" are displayed in science museums to demonstrate sound focusing.
A sonobuoy is a relatively small buoy – typically 13 cm (5 in) diameter and 91 cm (3 ft) long – expendable sonar system that is dropped/ejected from aircraft or ships conducting anti-submarine warfare or underwater acoustic research.
Lise Autogena is a Danish artist living in the United Kingdom. At the age of 17, she left home to live in Denmark's experimental community Christiania, an experience which she has said was very important in her development.
Acoustic location is a method of determining the position of an object or sound source by using sound waves. Location can take place in gases, liquids, and in solids.
Royal Air Force Scorton or more simply RAF Scorton is a former Royal Air Force satellite station located next to the village of Scorton in North Yorkshire, England. The base was opened in October 1939 as part of 13 Group RAF Fighter Command and a satellite station of RAF Catterick. It was used by the Royal Air Force, the Royal Canadian Air Force, and the United States Army Air Forces Ninth Air Force during the war.
Romney Sands Railway Station is a station on the Romney, Hythe and Dymchurch Railway in Kent, England. It is located on the bleakest part of the Romney Marsh, a shingle peninsula.
Royal Air Force Westonzoyland, or more simply RAF Westonzoyland, is one of the United Kingdom's oldest airfields, being established in the early 1920s. The airfield is located approximately 4 miles (6.4 km) east-southeast of Bridgwater, Somerset; about 125 miles (201 km) west-southwest of London.
The War Department halt was an informal railway station on the Romney, Hythe and Dymchurch Railway in Kent, England. Over the 15 years that the station was open, its location is believed to have moved several times. Details are scarce as this was a secret military installation, but the end of the War Department branch line moved as building work moved onto new stages. When the installation closed in 1945 the railway company took over the line for freight shipment of ballast. Again, the end point of the line changed several times as the exact location of extraction of ballast changed, until closure of the branch in 1951. The locations of the halt are now under water owing to subsequent commercial extractions and flooding of the ballast pits.
Major William Sansome Tucker was an English pioneer in acoustical research and inventor of the acoustic mirror
Royal Air Force Holmpton or more simply RAF Holmpton is a former Royal Air Force Cold War era nuclear bunker that was built in the 1950s as an early warning radar station as part of the ROTOR Radar Defence Programme. Located just south of the village of Holmpton, in the East Riding of Yorkshire, England, RAF Holmpton remained a part of the Defence Estate right up to 8 December 2014 when it was sold into private ownership after 62 years of military service.
Denge Marsh, also spelled Dengemarsh and occasionally called the Denge, is a part of Romney Marsh in Kent. Its north-west boundary is the town of Lydd; to the south-east is Denge Beach and Dungeness.
The Type-C hangar is a specific design of aircraft hangar built by the Royal Air Force during its expansion period of the 1930s. The hangar type generally measured 300 feet (91 m) in length, with a width of 152 feet 5 inches (46.46 m), and a clear height of 35 feet 4 inches (10.77 m). Whilst the type was designed, built and used during the expansion programme, installation of type-C hangars continued into the Second World War. By 1944, it was determined that in 64 RAF expansion period airfields, which were open at that time, at least one type-C hangar was present.
Il-Widna is a large acoustic mirror located in Magħtab, Malta.' The colloquial name of the acoustic mirror refers to Ear in Maltese. The mirror is 200 feet (61 m) long, approximately the same design as the sound Mirror in RAF Denge. The mirror was used during the Axis bombardment of Malta during the Second World war to detect incoming Luftwaffe (1941-1942) and Regia Aeronautica (1940-1941) bombers seeking to airstrike Malta. Il-Widna faces towards the island of Sicily, in Italy at a bearing of around 20 degrees. The mirror is also the only acoustic not built in the UK. Il-Widna was built between the autumn of 1934 and the summer of 1935. The required electrical equipment was installed in the first weeks of September 1935. The total cost of the development of the mirror on Malta was put at £4500. Tests making use of a flying boat found that the range of the mirror was around 25 miles (40 km). It was estimated that the mirror would provide a six minute warning of an enemy aircraft approaching Malta at 250 miles per hour (220 kn).
