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Ground Lift
In sound recording and reproduction, ground lift or earth lift is a technique used to reduce or eliminate ground-related noise arising from ground loops in audio cables. It may also increase or decrease noise from other sources. Activating the ground lift on a particular piece of equipment opens the connection between the equipment ground and the shielding conductor of audio cables attached to the equipment, leaving those cables grounded only at their opposite end. If all pieces of equipment are tied to a common ground reference without establishing ground loop, no current flows in the ground conductors and cable shields, and no noise is introduced into signal circuits. In applications such as sound reinforcement for a concert, however, it is difficult to ensure all equipment shares a common ground reference. Ground lift switch Professional audio equipment intended for use with balanced lines may have a ground lift switch for the cable shield. The ground lift switch eliminate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Recording And Reproduction
Sound recording and reproduction is the electrical, Mechanical system, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording. Acoustic analog recording is achieved by a microphone diaphragm that senses changes in atmospheric pressure caused by acoustics, acoustic sound waves and records them as a mechanical representation of the sound waves on a medium such as a phonograph record (in which a stylus cuts grooves on a record). In magnetic tape recording, the sound waves vibrate the microphone diaphragm and are converted into a varying electric current, which is then converted to a varying magnetic field by an electromagnet, which makes a representation of the sound as magnetized areas on a plastic tape with a magnetic coating on it. Analog sound reproduction is the reverse process, with a large ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground (electricity)
In electrical engineering, ground or earth may be a reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth. Electrical circuits may be connected to ground for several reasons. Exposed conductive parts of electrical equipment are connected to ground to protect users from electrical shock hazards. If internal insulation fails, dangerous voltages may appear on the exposed conductive parts. Connecting exposed conductive parts to a "ground" wire which provides a low-impedance path for current to flow back to the incoming neutral (which is also connected to ground, close to the point of entry) will allow circuit breakers (or RCDs) to interrupt power supply in the event of a fault. In electric power distribution systems, a protective earth (PE) conductor is an essential part of the safety provided by the earthing system. Connection to ground also limits the build-up of static ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Noise (audio)
Noise is sound, chiefly unwanted, unintentional, or harmful sound considered unpleasant, loud, or disruptive to mental or hearing faculties. From a physics standpoint, there is no distinction between noise and desired sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound. Acoustic noise is any sound in the acoustic domain, either deliberate (e.g., music or speech) or unintended. In contrast, noise in electronics may not be audible to the human ear and may require instruments for detection. In audio engineering, noise can refer to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as a hiss. This signal noise is commonly measured using A-weighting or ITU-R 468 weighting. In experimental sciences, noise can refer to any random fluctuations of data that hinders perception of a signal. Measurement Sound is measured based on the amplitude and frequency of a sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground Loop (electricity)
In an electrical system, a ground loop or earth loop occurs when two points of a circuit are intended to have the same ground reference potential but instead have a different potential between them. This is typically caused when enough current is flowing in the connection between the two ground points to produce a voltage drop and cause the two points to be at different potentials. Current may be produced in a ground loop by electromagnetic induction. Ground loops are a major cause of noise, hum, and interference in audio, video, and computer systems. Wiring practices that protect against ground loops include ensuring that all vulnerable signal circuits are referenced to one point as ground. The use of differential signaling can provide rejection of ground-induced interference. The removal of ground connections to equipment in an effort to eliminate ground loops will also eliminate the protection the safety ground connection is intended to provide. Description A ground l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
XLR Cable Connectors
XLR may refer to: * XLR connector, an electrical connector commonly used in audio equipment * Cadillac XLR, a retractable hardtop convertible automobile * ''Megas XLR'', an American animated television series * X-linked recessive inheritance * XL programming language runtime * A321XLR, a variant of the Airbus A321neo airliner XLR8 ("accelerate") * XLR8, a Filipino boy band * XLR8, a character in ''Ben 10'' * "XLR8", a song from Peter Andre's 2010 album '' Accelerate'' * XLR-8, a roller coaster * ''XLR8R ''XLR8R'' (pronounced "accelerator") is a website that covers music, culture, style, and technology. It was originally also a print magazine. History and profile ''XLR8R'' was founded as a newsprint zine in 1993 by publisher Andrew Smith in S ...'', a web magazine * ''XLR8R'' (album), a 2001 album by Orbit * XLR8er, a 1987 CPU board produced by H.I. Tech See also * {{dab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Reinforcement System
A sound reinforcement system is the combination of microphones, signal processors, amplifiers, and loudspeakers in Loudspeaker enclosure, 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 effects unit, electronic effects, such as reverb, as opposed to simply amplifying the sources unaltered. A sound reinforcement system for a rock concert in a stadium may be very complex, including hundreds of microphones, complex live sound mixing and signal processing systems, tens of thousands of watts of Audio power amplifier, amplifier power, and multiple Line array, loudspeaker arrays, all overseen by a team of audio engineers and technicians. On the other hand, a sound reinforcement system can be as simple as a small public address (P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Balanced Line
In telecommunications and professional audio, a balanced line or balanced signal pair is an electrical circuit consisting of two conductors of the same type, both of which have equal impedances along their lengths, to ground, and to other circuits. The primary advantage of the balanced line format is good rejection of common-mode noise and interference when fed to a differential device such as a transformer or differential amplifier.G. Ballou, ''Handbook for Sound Engineers'', Fifth Edition, Taylor & Francis, 2015, p. 1267–1268. As prevalent in sound recording and reproduction, balanced lines are referred to as balanced audio. A common form of balanced line is twin-lead, used for radio frequency communications. Also common is twisted pair, used for traditional telephone, professional audio, or for data communications. They are to be contrasted to unbalanced lines, such as coaxial cable, which is designed to have its return conductor connected to ground, or circuits w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
XLR Connector
The XLR connector (also Cannon plug and Cannon connector) is a type of electrical connector primarily used in professional audio, video, and stage lighting equipment. XLR connectors are cylindrical, with three to seven connector pins, and are often employed for analog balanced audio interconnections, AES3 digital audio, portable intercom, DMX512 lighting control, and for low-voltage power supply. XLR connectors are part of the international standard for dimensions, International Electrotechnical Commission, IEC 61076-2-103. The XLR connector resembles the DIN connector, but is larger, more robust and physically incompatible. The generic term "XLR" began as a trademark of Cannon (company), Cannon Electric, with the letters standing for X model connector with an added "L"atch feature, and "R"esilient neoprene rubber surrounding the female contacts. History and manufacturers The XLR connector was invented by James H. Cannon#James H. Cannon, James H. Cannon, founder of the Cannon ... [...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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheater Plug
A cheater plug, AC ground lifter or three-prong/two-prong adapter is an adapter that allows a NEMA 5-15P grounding-type plug (three prongs) to connect to a NEMA 1-15R non-grounding receptacle (two slots). They are needed to allow appliances with 3-wire power cords to plug into legacy ungrounded (two slot) receptacles found in older buildings. The use of such an adapter avoids the need to replace receptacles, but is potentially hazardous if the grounding tab is not connected to electrical ground. These adapters are illegal in some jurisdictions, in particular throughout Canada. A safer and more reliable alternative identified in the US and Canadian electrical codes is to replace the outlet with a Ground Fault Circuit Interrupter (GFCI) breaker outlet. Cheater plugs are also used to break ground loops in audio systems. This practice has been condemned as disregarding electrical safety. A safer and more reliable alternative is to use an isolation transformer made specif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leslie Harvey
Leslie Cameron Harvey (13 September 1944 – 3 May 1972) was a Scottish guitarist in several bands of the late 1960s and early 1970s, most notably Stone the Crows. He was the brother of Alex Harvey. Career In the 1960s, Harvey was asked to join the Animals by Alan Price but chose to stay with his brother in the Alex Harvey Soul Band. He later joined the Blues Council, another Scottish band. The Blues Council made one record, ''Baby Don't Look Down''. In March 1965, their tour van crashed, killing vocalist Fraser Calder and bassist James Giffen, and the rest of the band went their separate ways. In 1969, Harvey joined the Scottish band Cartoone to record some tracks for their second album. He also accompanied Cartoone on their live tour of the United States supporting Led Zeppelin. They also supported the US band Spirit in 1969. John Lee Hooker, whose songs both Harvey and Cartoone used to cover on their tour of the UK, was their opening act. In December 1969 Harvey pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keith Relf
William Keith Relf (22 March 194312 May 1976) was an English musician, best known as the lead vocalist and harmonica player for rock band the Yardbirds. He then formed the band Renaissance with his sister Jane Relf, the Yardbirds ex-drummer Jim McCarty and ex- The Nashville Teens keyboardist John Hawken. Early life Relf was born in the Richmond Institution on 22 March 1943 to Mary Elsie Vickers and William Arthur Percy Relf. Keith had a sister Jane. His father was a builder, while his mother was a housewife. Musical career Relf started playing in bands around the summer of 1956 as a singer, guitarist, and harmonica player. Relf co-wrote many of the original Yardbirds songs (" Shapes of Things", "I Ain't Done Wrong", " Over Under Sideways Down", " Happenings Ten Years Time Ago"), later showing a leaning towards acoustic/folk music as the sixties unfolded ("Only the Black Rose"). He also sang an early version of " Dazed and Confused" in live Yardbirds concerts, after hea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
