|
Harry Olson
Harry Ferdinand Olson (December 28, 1901 – April 1, 1982) was a prominent engineer at RCA Victor and a pioneer in the field of 20th century acoustical engineering. Biography Harry F. Olson was born in Mount Pleasant, Iowa, to Swedish immigrant parents. Technically inclined from an early age, he built and flew model airplanes, constructed a steam engine and invented a wood-fired boiler that drove a 100-volt DC generator. Olson designed and built an amateur radio transmitter, gaining enough proficiency to be granted an operator's license. Olson went on to earn a bachelor's degree in electrical engineering from the University of Iowa then continued to earn a master's degree with a thesis on acoustic wave filters in solids and a doctorate in physics, working with polarization of resonance radiation in mercury. Immediately after completing his course of study in 1928, Olson moved to New Jersey to work for RCA Laboratories. Olson would remain at RCA for almost four decades. Olson ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RCA Victor
RCA Records is an American record label currently owned by Sony Music Entertainment, a subsidiary of Sony Corporation of America. It is one of Sony Music's four flagship labels, alongside RCA's former long-time rival Columbia Records; also Arista Records, and Epic Records. The label has released multiple genres of music, including pop, classical, rock, hip hop, afrobeat, electronic, R&B, blues, jazz, and country. Its name is derived from the initials of its defunct parent company, the Radio Corporation of America (RCA). RCA Records was fully acquired by Bertelsmann in 1987, making it a part of Bertelsmann Music Group (BMG) and became a part of Sony BMG Music Entertainment after the 2004 merger of BMG and Sony; it was acquired by the latter in 2008, after the dissolution of Sony/BMG and the restructuring of Sony Music. RCA Records is the corporate successor of the Victor Talking Machine Company, founded in 1901, making it the second-oldest record label in American hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RCA Type 77-A Microphone
The RCA Type 77-A microphone was a simplex (''uni-directional'') ribbon microphone A ribbon microphone, also known as a ribbon velocity microphone, is a type of microphone that uses a thin aluminum, duraluminum or nanofilm of electrically conductive ribbon placed between the poles of a magnet to produce a voltage by electromag ..., the forerunner of the RCA Type 77-DX microphone. The 77-A was designed Dr. Harry F. Olson in the late 1920s or early 1930s; prototypes are rumored to have existed in 1929 and 1930, but the 77-A was not announced until 1932. The 77-A would set the standard for all other RCA ribbon microphone comparisons for the next 40 years. Construction It featured a spiral acoustic labyrinth inside the case and two vertical in-line ribbons which enabled it to be uni-directional. External linksRCA Type 77-A information from www.coutant.org {{product-stub Ribbon microphones ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASA Gold Medal
The ASA Gold Medal is an annual award presented by the Acoustical Society of America (ASA) to individuals in recognition of outstanding contributions to acoustics. The Gold Medal was first presented in 1954 and is the highest award of the ASA. Past recipients, which include the Nobel Laureate Georg von Békésy, are listed below. Recipients Notes See also * List of physics awards This list of physics awards is an index to articles about notable awards for physics. The list includes lists of awards by the American Physical Society of the United States, and of the Institute of Physics of the United Kingdom, followed by a l ... References {{ASA Gold Medal Awards of the Acoustical Society of America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ASA Silver Medal
The ASA Silver Medal is an award presented by the Acoustical Society of America to individuals, without age limitation, for contributions to the advancement of science, engineering, or human welfare through the application of acoustic principles or through research accomplishments in acoustics. The medal is awarded in a number of categories depending on the technical committee responsible for making the nomination. Recipients of the medal are listed below. Silver Medal SourceAcoustical Society of America Silver Medal in Acoustical Oceanography * 1993 – Clarence S. Clay – ''for contributions to understanding acoustic propagation in layered waveguides, scattering from the ocean's boundaries and marine life, and ocean parameters and processes.'' * 1997 – Herman Medwin – ''for contributions to the understanding of acoustical scattering, absorption and ambient noise, particularly in relation to the acoustics of bubbles in the sea.'' * 2004 – D. Vance Holliday ''– for con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acoustical Society Of America
The Acoustical Society of America (ASA) is an international scientific society founded in 1929 dedicated to generating, disseminating and promoting the knowledge of acoustics and its practical applications. The Society is primarily a voluntary organization of about 7500 members and attracts the interest, commitment, and service of many professionals. History In the summer of 1928, (See Wallace Clement Sabine.) Floyd R. Watson and Wallace Waterfall (1900–1974), a former doctoral student of Watson, were invited by UCLA's Vern Oliver Knudsen to an evening dinner at Knudsen's beach club in Santa Monica. The three physicists decided to form a society of acoustical engineers interested in architectural acoustics. In the early part of December 1928, Wallace Waterfall sent letters to sixteen people inquiring about the possibility of organizing such a society. Harvey Fletcher offered the use of the Bell Telephone Laboratories at 463 West Street in Manhattan as a meeting place for an or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Audio Engineering Society
The Audio Engineering Society (AES) is a professional body for engineers, scientists, other individuals with an interest or involvement in the professional audio industry. The membership largely comprises engineers developing devices or products for audio, and persons working in audio content production. It also includes acousticians, audiologists, academics, and those in other disciplines related to audio. The AES is the only worldwide professional society devoted exclusively to audio technology. Established in 1948, the Society develops, reviews and publishes engineering standards for the audio and related media industries, and produces the AES Conventions, which are held twice a year alternating between Europe and the US. The AES and individual regional or national ''sections'' also hold ''AES Conferences'' on different topics during the year. History The idea of a society dedicated solely to audio engineering had been discussed for some time before the first meeting, but wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analogical Models
Analogical models are a method of representing a phenomenon of the world, often called the "target system" by another, more understandable or analysable system. They are also called dynamical analogies. Two open systems have ''analog'' representations (see illustration) if they are black box isomorphic systems. Explanation Analogizing is the process of representing information about a particular subject (the analogue or source system) by another particular subject (the target system). A simple type of analogy is one that is based on shared properties (Stanford Encyclopedia of Philosophy). Analogical models, also called "analog" or "analogue" models, therefore seek the analog systems that share properties with the target system as a means of representing the world. It is often practicable to construct source systems that are smaller and/or faster than the target system so that one can deduce '' a priori'' knowledge of target system behaviour. Analog devices are therefore thos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Address
A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. Typical applications include sports stadiums, public transportation vehicles and facilities, and live or recorded music venues and events. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution. Simple PA systems are often used in small venues such as school auditoriums, churches, and small bars. PA systems with many speakers are widely used to make announcements in public, institutional and commercial buildings ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound-on-film
Sound-on-film is a class of sound film processes where the sound accompanying a picture is recorded on photographic film, usually, but not always, the same strip of film carrying the picture. Sound-on-film processes can either record an analog sound track or digital sound track, and may record the signal either optically or magnetically. Earlier technologies were sound-on-disc, meaning the film's soundtrack would be on a separate phonograph record. History Sound on film can be dated back to the early 1880s, when Charles E. Fritts filed a patent claiming the idea. In 1923 a patent was filed by E. E. Ries, for a variable density soundtrack recording, which was submitted to the SMPE (now SMPTE), which used the mercury vapor lamp as a modulating device to create a variable-density soundtrack. Later, Case Laboratories and Lee De Forest attempted to commercialize this process, when they developed an Aeolite glow lamp, which was deployed at Movietone Newsreel at the Roxy Theatr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noise Reduction
Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an undesired signal component from the desired signal component, as with common-mode rejection ratio. All signal processing devices, both analog and digital, have traits that make them susceptible to noise. Noise can be random with an even frequency distribution (white noise), or frequency-dependent noise introduced by a device's mechanism or signal processing algorithms. In electronic systems, a major type of noise is ''hiss'' created by random electron motion due to thermal agitation. These agitated electrons rapidly add and subtract from the output signal and thus create detectable noise. In the case of photographic film and magnetic tape, noise (both visible and audible) is introduced due to the grain structure of the medium. In photog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Cartridge
A magnetic cartridge, more commonly called a phonograph cartridge or phono cartridge or (colloquially) a pickup, is an electromechanical transducer that is used to play records on a turntable. The cartridge contains a removable or permanently mounted stylus, the tip - usually a gemstone, such as diamond or sapphire - of which makes physical contact with the record's groove. In popular usage and in disc jockey jargon, the stylus, and sometimes the entire cartridge, is often called the needle. As the stylus tracks the serrated groove, it vibrates a cantilever on which is mounted a permanent magnet which moves between the magnetic fields of sets of electromagnetic coils in the cartridge (or vice versa: the coils are mounted on the cantilever, and the magnets are in the cartridge). The shifting magnetic fields generate an electrical current in the coils. The electrical signal generated by the cartridge can be amplified and then converted into sound by a loudspeaker. History T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isobaric Speakers
The Isobaric loudspeaker configuration was first introduced by Harry F. Olson in the early 1950s, and refers to systems in which two or more identical woofers (bass drivers) operate simultaneously, with a common body of enclosed air adjoining one side of each diaphragm. In practical applications, they are most often used to improve low-end frequency response without increasing cabinet size, though at the expense of cost and weight. The name is derived from the term Isobar ("equal pressure"), which comes from the Greek word "isobares", meaning "of equal weight". As the word implies, the enclosed air does indeed experience roughly equal pressures from each diaphragm it contacts, but those forces are actually parallel, rather than opposing, so the air is forced to move. Design principles Two identical loudspeakers are coupled to work together as one unit: they are mounted one behind the other in a casing to define a sealed chamber of air in between them. The volume of this "isobar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
