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Halim El-Dabh
Halim Abdul Messieh El-Dabh ( ar, حليم عبد المسيح الضبع, ''Ḥalīm ʻAbd al-Masīḥ al-Ḍab''ʻ; March 4, 1921 – September 2, 2017) was an Egyptian-American composer, musician, ethnomusicologist, and educator, who had a career spanning six decades. He is particularly known as an early pioneer of electronic music. In 1944 he composed one of the earliest known works of tape music, or musique concrète. From the late 1950s to early 1960s he produced influential work at the Columbia-Princeton Electronic Music Center. Early life El-Dabh was born and grew up in Sakakini, Cairo, Egypt, a member of a large and affluent Coptic Christian family that had earlier emigrated from Abutig in the Upper Egyptian province of Asyut. The family name means "the hyena" and is not uncommon in Egypt. In 1932 the family relocated to the Cairo suburb of Heliopolis. Following his father's profession of agriculture, he graduated from Fuad I University (now Cairo University) in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cleveland
Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U.S. maritime border with Canada, northeast of Cincinnati, northeast of Columbus, and approximately west of Pennsylvania. The largest city on Lake Erie and one of the major cities of the Great Lakes region, Cleveland ranks as the 54th-largest city in the U.S. with a 2020 population of 372,624. The city anchors both the Greater Cleveland metropolitan statistical area (MSA) and the larger Cleveland–Akron–Canton combined statistical area (CSA). The CSA is the most populous in Ohio and the 17th largest in the country, with a population of 3.63 million in 2020, while the MSA ranks as 34th largest at 2.09 million. Cleveland was founded in 1796 near the mouth of the Cuyahoga River by General Moses Cleaveland, after whom the city was named ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asyut Governorate
AsyutAlso spelled ''Assiout'' or ''Assiut'' ( ar, أسيوط ' , from ' ) is the capital of the modern Asyut Governorate in Egypt. It was built close to the ancient city of the same name, which is situated nearby. The modern city is located at , while the ancient city is located at . The city is home to one of the largest Coptic Catholic churches in the country. History Names and etymology The name of the city is derived from early Egyptian Zawty (''Z3JW.TJ'') (late Egyptian, Səyáwt) adopted into the Coptic as Syowt , which means "''Guardian''" of the northern approach of Upper Egypt. In Graeco-Roman Egypt, it was called Lycopolis or Lykopolis ( el, Λυκόπολις, ""), ('wolf city') Lycon, or Lyco. Ancient Asyut Ancient Asyut was the capital of the Thirteenth Nome of Upper Egypt (''Lycopolites Nome'') around 3100 BC. It was located on the western bank of the Nile. The two most prominent gods of ancient Egyptian Asyut were Anubis and Wepwawet, both funerary deit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverb
Reverberation (also known as reverb), in acoustics, is a persistence of sound, after a sound is produced. Reverberation is created when a sound or signal is reflected causing numerous reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space – which could include furniture, people, and air. This is most noticeable when the sound source stops but the reflections continue, their amplitude decreasing, until zero is reached. Reverberation is frequency dependent: the length of the decay, or reverberation time, receives special consideration in the architectural design of spaces which need to have specific reverberation times to achieve optimum performance for their intended activity. In comparison to a distinct echo, that is detectable at a minimum of 50 to 100 ms after the previous sound, reverberation is the occurrence of reflections that arrive in a sequence of less than approximately 50 ms. As time passes, the amplitude of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recording Room
A recording studio is a specialized facility for sound recording, mixing, and audio production of instrumental or vocal musical performances, spoken words, and other sounds. They range in size from a small in-home project studio large enough to record a single singer-guitarist, to a large building with space for a full orchestra of 100 or more musicians. Ideally, both the recording and monitoring (listening and mixing) spaces are specially designed by an acoustician or audio engineer to achieve optimum acoustic properties (acoustic isolation or diffusion or absorption of reflected sound echoes that could otherwise interfere with the sound heard by the listener). Recording studios may be used to record singers, instrumental musicians (e.g., electric guitar, piano, saxophone, or ensembles such as orchestras), voice-over artists for advertisements or dialogue replacement in film, television, or animation, foley, or to record their accompanying musical soundtracks. The typica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable-gain Amplifier
A variable-gain (VGA) or voltage-controlled amplifier (VCA) is an electronic amplifier that varies its gain depending on a control voltage (often abbreviated CV). VCAs have many applications, including audio level compression, synthesizers and amplitude modulation. A crude example is a typical inverting op-amp configuration with a light-dependent resistor (LDR) in the feedback loop. The gain of the amplifier then depends on the light falling on the LDR, which can be provided by an LED (an optocoupler). The gain of the amplifier is then controllable by the current through the LED. This is similar to the circuits used in optical audio compressors. A voltage-controlled amplifier can be realised by first creating a voltage-controlled resistor (VCR), which is used to set the amplifier gain. The VCR is one of the numerous interesting circuit elements that can be produced by using a JFET (junction field-effect transistor) with simple biasing. VCRs manufactured in this way can be ob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echo Chamber
Echo chamber of the Dresden University of Technology Hamilton Mausoleum has a long-lasting unplanned echo An echo chamber is a hollow enclosure used to produce reverberation, usually for recording purposes. For example, the producers of a television or radio program might wish to produce the aural illusion that a conversation is taking place in a large room or a cave; these effects can be accomplished by playing the recording of the conversation inside an echo chamber, with an accompanying microphone to catch the reverberation. Nowadays, effects units are more widely used to create such effects, but echo chambers are still used today, such as the famous echo chambers at Capitol Studios. In music, the use of acoustic echo and reverberation effects has taken many forms and dates back many hundreds of years. Sacred music of the Medieval and Renaissance periods relied heavily on the composers' extensive understanding and use of the complex natural reverberation and echoes insi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverberation
Reverberation (also known as reverb), in acoustics, is a persistence of sound, after a sound is produced. Reverberation is created when a sound or signal is reflected causing numerous reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space – which could include furniture, people, and air. This is most noticeable when the sound source stops but the reflections continue, their amplitude decreasing, until zero is reached. Reverberation is frequency dependent: the length of the decay, or reverberation time, receives special consideration in the architectural design of spaces which need to have specific reverberation times to achieve optimum performance for their intended activity. In comparison to a distinct echo, that is detectable at a minimum of 50 to 100 ms after the previous sound, reverberation is the occurrence of reflections that arrive in a sequence of less than approximately 50 ms. As time passes, the amplitude of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exorcism
Exorcism () is the religious or spiritual practice of evicting demons, jinns, or other malevolent spiritual entities from a person, or an area, that is believed to be possessed. Depending on the spiritual beliefs of the exorcist, this may be done by causing the entity to swear an oath, performing an elaborate ritual, or simply by commanding it to depart in the name of a higher power. The practice is ancient and part of the belief system of many cultures and religions. Buddhism The practice of reciting or listening to the Paritta began very early in the history of Buddhism. It is a Buddhist practice of reciting certain verses and scriptures from Pali Canon in order to ward off misfortune or danger. The belief in the effective spiritual power to heal, or protect, of the '' Sacca-kiriyā'', or asseveration of something quite true is an aspect of the work ascribed to the ''paritta''. Several scriptures in the Paritta like Metta Sutta, Dhajagga Sutta, or Ratana Sutta can be reci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zār
In the cultures of the Horn of Africa and adjacent regions of the Middle East, ''Zār'' ( ar, زار, gez, ዛር) is the term for a demon or spirit assumed to possess individuals, mostly women, and to cause discomfort or illness. The so-called ''zār'' ritual or ''zār'' cult is the practice of exorcising such spirits from the possessed individual. ''Zār'' exorcism has become popular in the contemporary urban culture of Cairo and other major cities of the Islamic world as a form of women-only entertainment. ''Zār'' gatherings involve food and musical performances and they culminate in ecstatic dancing, lasting between three and seven nights. The '' tanbūra'', a six-string bowl lyre, is often used in the ritual. Other instruments include the '' manjur'', a leather belt sewn with many goat hooves, and various percussion instruments. History Scholarship in the early 20th century attributed Abyssinian (Ethiopian and Eritrean) origin to the custom, although there were also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre Schaeffer
Pierre Henri Marie Schaeffer (English pronunciation: , ; 14 August 1910 – 19 August 1995) was a French composer, writer, broadcaster, engineer, musicologist, acoustician and founder of Groupe de Recherche de Musique Concrète (GRMC). His innovative work in both the sciences—particularly communications and acoustics—and the various arts of music, literature and radio presentation after the end of World War II, as well as his anti-nuclear activism and cultural criticism garnered him widespread recognition in his lifetime. Amongst the vast range of works and projects he undertook, Schaeffer is most widely and currently recognized for his accomplishments in electronic and experimental music, at the core of which stands his role as the chief developer of a unique and early form of avant-garde music known as musique concrète. The genre emerged in Europe from the utilization of new music technology developed in the post-war era, following the advance of electroacoustic and acous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wire Recording
Wire recording or magnetic wire recording was the first magnetic recording technology, an analog type of audio storage in which a magnetic recording is made on a thin steel wire. The first crude magnetic recorder was invented in 1898 by Valdemar Poulsen. The first magnetic recorder to be made commercially available anywhere was the Telegraphone, manufactured by the American Telegraphone Company, Springfield, Massachusetts in 1903. The wire is pulled rapidly across a recording head which magnetizes each point along the wire in accordance with the intensity and polarity of the electrical audio signal being supplied to the recording head at that instant. By later drawing the wire across the same or a similar head while the head is not being supplied with an electrical signal, the varying magnetic field presented by the passing wire induces a similarly varying electric current in the head, recreating the original signal at a reduced level. Magnetic wire recording was replaced by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agricultural Engineering
Agricultural engineering, also known as agricultural and biosystems engineering, is the field of study and application of engineering science and designs principles for agriculture purposes, combining the various disciplines of mechanical, civil, electrical, food science, environmental, software, and chemical engineering to improve the efficiency of farms and agribusiness enterprises as well as to ensure sustainability of natural and renewable resources. An agricultural engineer is an engineer with an agriculture background. Agricultural engineers make the engineering designs and plans in an agricultural project, usually in partnership with an agriculturist who is more proficient in farming and agricultural science. History The first use of agricultural engineering was the introduction of irrigation in large scale agriculture in the Nile and the Euphrates rivers before 2000 B.C. Large irrigation structures were also present in Baluchistan and India before Christian era. In S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
