Alarm SoundsAlarm sounds and sound effects at Avosound – Alarm sounds are available in a wide range of variations: Alarm sounds, alarm sirens, fire alarm, ambulance sirens, sirens wailing and fire department and police sirens. During World War II, pneumatic, electric, or manually operated mechanical alarm systems were used to generate loud, long-range siren wails to warn of air raids. These mechanical alarm sirens are still found in widespread use today for civil protection in many countries. Different types of sirens were distinguished. Air alarm is characterized by-. Decaying sirens wail out. Water alarm through short, loud alarm pulses. Civil defense alert tones are available for earthquake and disaster alerts, which hopefully you never have to hear. Also a rather unpleasant case of alarm is the ABC alarm. The siren signal of the ABC alarm is like the air raid alarm an up and down wailing sound that is repeated
Alarm sirens and bells
Alarm can be triggered with an alarm bell, a mechanical alarm siren or via an electric siren. Car alarm systems or burglar alarms usually use electric sirens. Other alarm systems, are created by the company Klaxon, which have been found in industrial plants for many years. The familiar Klaxon alarm is also typical of sirens on submarines or on aircraft carriers. Also relying on Klaxon alarm systems was the Empire a long, long time ago on the Death Star, they dan also liked to use the Klaxon horn as an alarm. Other variations of audible alarm. Beeps can be found in the emergency. Fire alarm, fire department alarm sirens, police sirens or ambulance sirens differed from country to country. American police car sirens are on-. Decaying while a two-tone siren is used in Europe.
On Avosound are a variety of alarm sounds, alarm sirens, sirens, alarm bells and siren sounds that you can listen to easily.
Mechanical Alarm Sounds
Mechanical alarm sirens produce a wailing sound with the rotation of a drum fitted with blades in a cover provided with openings. The pitch of the wailing sound increases as the number of revolutions of the siren rotor increases, creating an on and off swelling siren alert. The siren can be driven electrically however also by hand. These mechanical alarm sirens are common in many countries around the world. In the United States, at the time of the Cold War, very large and loud mechanical alarm sirens were powered by V8 cylinder engines. In Germany, the mechanical siren type is called Einheitssirene E57, although in East Germany and the countries of the former Soviet Union, at the time of the GDR used its own siren type of the same design. This alarm siren should be audible over a long distance. Generate a wailing alarm sound of over 105 db at the siren. In rural areas, the siren sound should still be a volume of 70db at 700m distance. In cities and industrial facilities, this value decreases sharply. – The American alarm siren with the V8 engine might have been a lot louder. Air-powered alarm sirens can produce enormous sound pressure. Distribute this with horns attached to the siren head over long distances. The design of air-powered alarm sirens differs from mechanical sirens. While the mechanical alarm siren generates airflow by centrifugal force, air-powered alarm sirens have airflow directed into the siren head from a compressed air tank. The air-powered alarm siren (pneumatic sirens) can be easily recognized by the mounted horns on the siren head. Similar to a mechanical siren, air-operated alarm sirens produce the siren sound with the cyclic interruption of the air flow through a perforated disc. Sirens of this principle are also called perforated disc sirens. This rotating disc is called a rotor. Is electrically driven in the siren head. The airflow is through holes in the siren rotor. The outside opening directed. Spinning the siren rotor opens and closes the holes, causing the airflow to create the siren sound, which is then directed into multiple horns. The airflow to operate the siren is piped into the siren head from a compressed air tank underneath the siren.
Klaxon Alarm Sounds
Very closely associated with alarm sirens is the name Klaxon. The English company Klaxon built the first mechanical sirens and horns in Birmingham. Until they were later replaced by electric versions, mechanical sirens and horns were standard in cars, trains and ships. A very typical application of the Klaxon Alarm is the diving alarm on submarines. Klaxon alarm sirens have been used in harsh environments such as submarines, ships and industrial plants. So it's not surprising that this very unique sound has been used in a variety of movies over the years. A submarine movie without a Klaxon alarm is not a real submarine movie, because the Klaxon siren was used as a dive alarm. Another very famous use of the Klaxon horn can be found in the Starwars movies by George Lucas. Ben Burtt, the sound designer and founding father of Starwars sounds, used the Klaxon horn on Death Star and in other sequences in the movies.