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Decibel Meters
A sound level meter (also called sound pressure level meter (SPL)) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability. The diaphragm of the microphone responds to changes in air pressure caused by sound waves. That is why the instrument is sometimes referred to as a sound pressure level meter (SPL). This movement of the diaphragm, i.e. the sound pressure (unit pascal, Pa), is converted into an electrical signal (unit volt, V). While describing sound in terms of sound pressure, a logarithmic conversion is usually applied and the sound pressure ''level'' is stated instead, in decibels (dB), with 0 dB SPL equal to 20 micropascals. A microphone is distinguishable by the voltage value produced when a known, constant root mean square sound pressure is applied. This is known as microphone sensitivity. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optimus Sound Level Meter
Optimus may refer to: Organisations * Optimus Telecomunicações, S.A., a Portuguese mobile phone company who was merged with ZON and formed a new company called NOS * Optimus S.A., a former Polish computer assembler Fictional characters *Optimus Prime, a ''Transformers'' character, leader of the Autobots * Optimus Primal, a ''Transformer'' character, leader of the Maximals Music * Optimus Rhyme, a trio of nerdcore rap artists * ''Optimus'' (album), an album by guitarist John Norum Technology * LG Optimus, a series of smartphones by LG Electronics * Nvidia Optimus, a technology which saves laptop battery life by switching between two graphics adapters * Optimus UI, a front-end touch interface developed by LG Electronics with partners * Optimus Maximus keyboard, a keyboard with displays in each key * Optimus brand, a proprietary RadioShack brand of electronic products * Optimus platform, a process integration and design optimization software by Noesis Solutions * Tesla Bot, als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cirrus Research
Cirrus may refer to: Science *Cirrus (biology), any of various thin, thread-like structures on the body of an animal * Cirrus (botany), a tendril *Infrared cirrus, in astronomy, filamentary structures seen in infrared light *Cirrus cloud, a type of cloud Aviation *Cirrus aero engines, a series of British aircraft engines manufactured by various companies from the 1920s to the 1950s *Cirrus Aircraft, an aircraft manufacturer in Duluth, Minnesota, USA *Cirrus Airlines, a defunct regional airline in Hallbergmoos, Germany *Cirrus (rocket), a German research rocket first launched in 1961 * Schempp-Hirth Cirrus, an Open-class sailplane *Schempp-Hirth Standard Cirrus, a Standard-class sailplane *Swing Cirrus, a German paraglider design Music * ''Cirrus'' (album), a 1974 release by Bobby Hutcherson *Cirrus (band), an American electronica duo * "Cirrus" (song), a 2013 instrumental by DJ Bonobo * "Cirrus Minor" (song), a 1969 song by Pink Floyd Other uses *Chrysler Cirrus, a car produce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Pressure Level
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa). Mathematical definition A sound wave in a transmission medium causes a deviation (sound pressure, a ''dynamic'' pressure) in the local ambient pressure, a ''static'' pressure. Sound pressure, denoted ''p'', is defined by p_\text = p_\text + p, where * ''p''total is the total pressure, * ''p''stat is the static pressure. Sound measurements Sound intensity In a sound wave, the complementary variable to sound pressure is the particle velocity. Together, they determine the sound intensity of the wave. ''Sound intensity'', denoted I and measured in W· m−2 in SI units, is defined by \mathbf I = p \mathbf v, where * ''p'' is the sound pressure, * v is the particle velocity. Acoustic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weighting Filter
A weighting filter is used to emphasize or suppress some aspects of a phenomenon compared to others, for measurement or other purposes. Audio applications In each field of audio measurement, special units are used to indicate a weighted measurement as opposed to a basic physical measurement of energy level. For sound, the unit is the phon (1 kHz equivalent level). Sound Sound has three basic components, the wavelength, frequency, and speed. In sound measurement, we measure the loudness of the sound in decibels (dB). Decibels are logarithmic with 0 dB as the reference. There are also a range of frequencies that sounds can have. Frequency is the number of times a sine wave repeats itself in a second. Normal auditory systems can usually hear between 20 and 20,000 Hz. When we measure sound, the measurement instrument takes the incoming auditory signal and analyzes it for these different features. Weighting filters in these instruments then filter out certain fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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