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Dynaquad
Dynaquad, or DY, was a matrix decoder 4-channel quadraphonic sound system developed by Dynaco in 1969. The system originally had four speakers that were arranged in a diamond shape (centre-front, centre-left, centre-rear, centre-right). Initially (first available in 1969 with th ''Dynaco SCA-80Q'' amplifier ), it was introduced as a derived (2:2:4) four channel "decoding" system based on the Hafler circuit, where the back channels played ambient sounds recovered from standard stereo sounds. As such it wasn't used initially used as an encoding method (a similar approach was used on the Electrovoice Stereo-4 system). Commercial usage A simpler form of Dynaquad was adopted, allowing an easy adaptation of existing home setups. The two forward speakers remain in their normal positions, with the user only needing to add two similarly positioned back speakers, forming a square (front-left, front-right, back-left, back-right). Four channel record pioneers Vanguard Records starte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynaquad Channels Surround Sound
Dynaquad, or DY, was a matrix decoder 4-channel quadraphonic sound system developed by Dynaco in 1969. The system originally had four speakers that were arranged in a diamond shape (centre-front, centre-left, centre-rear, centre-right). Initially (first available in 1969 with th ''Dynaco SCA-80Q'' amplifier ), it was introduced as a derived (2:2:4) four channel "decoding" system based on the Hafler circuit, where the back channels played ambient sounds recovered from standard stereo sounds. As such it wasn't used initially used as an encoding method (a similar approach was used on the Electrovoice Stereo-4 system). Commercial usage A simpler form of Dynaquad was adopted, allowing an easy adaptation of existing home setups. The two forward speakers remain in their normal positions, with the user only needing to add two similarly positioned back speakers, forming a square (front-left, front-right, back-left, back-right). Four channel record pioneers Vanguard Records starte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quadraphonic Sound
Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for the reproduction of sound signals that are (wholly or in part) independent of one another. Four channel quadraphonic surround sound can be used to recreate the highly realistic effect of a three-dimensional live concert hall experience in the home. It can also be used to enhance the listener experience beyond the directional limitations of ordinary two channel stereo sound. Quadraphonic audio was the earliest consumer product in surround sound. Since it was introduced to the public in the early 1970s many thousands of quadraphonic recordings have been made. Quadraphonic sound was a commercial failure when first introduced due to a variety of technical issues and format incompatibilities. Four channel audio formats can be more expensive t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matrix Decoder
Matrix decoding is an audio technology where a small number of discrete audio channels (e.g., 2) are decoded into a larger number of channels on play back (e.g., 5). The channels are generally, but not always, arranged for transmission or recording by an encoder, and decoded for playback by a decoder. The function is to allow multichannel audio, such as quadraphonic sound or surround sound to be encoded in a stereo signal, and thus played back as stereo on stereo equipment, and as surround on surround equipment – this is "compatible" multichannel audio. Process Matrix encoding does ''not'' allow one to encode several channels in ''fewer'' channels without losing information: one cannot fit 5 channels into 2 (or even 3 into 2) without losing information, as this loses dimensions: the decoded signals are not independent. The idea is rather to encode something that will both be an acceptable approximation of the surround sound when decoded, and acceptable (or even superior) stereo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hafler Circuit
The Hafler circuit is a passive electronics circuit with the aim of getting derived surround sound or ambiophony from regular stereo recordings without using costly electronics. Such circuits are generally known as matrix decoders. The Dynaquad system works using similar principles. Named after its early proponent audio engineer David Hafler, the circuit exploits the high amount of stereo separation between Left and Right channels and sound phase. This type of system is called ''2:2:4'', since the rear channels are simulated from a two-channel stereo track, with no actual extra tracks encoded. The rear channels will playback out of phase sounds, while the forward channels are unaffected. Using the circuit typically reduces stereo separation by only about 2 dB and the rear speakers are only required to reproduce a limited frequency range (allowing them to be smaller and cheaper). Operation The rear sound level in a live performance recorded in stereo is reproduced abou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stereo-4
Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a matrix 4-channel quadraphonic sound system developed in 1970 by Leonard Feldman and Jon Fixler. The system was heavily promoted by RadioShack stores in the United States, and some record companies released LP albums encoded in this format. It was the first commercial quadraphonic sound system for LP records. Development The original EV system was compatible with the Dynaquad DY system, and is related to Sansui's QS Regular Matrix system. The EV and QS records are very close to each other—it would take an expert to tell them apart by ear. EV decoders were sometimes used to produce pseudo 4-channel effects from 2-channel stereo recordings. In 1973 Electro-Voice signed an agreement with Columbia/CBS Records to build a new ''universal'' decoder that could decode both SQ and EV records with good results. It could even decode QS records—again, with good results. EV later suggested the same coefficients for an encoder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynaco
Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, Dynaco was an American hi-fi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components..Dunn, Greg, Dynaco Company History', retrieved 8 August 2011 Its best known product was the ST-70 tube stereo amplifier. They also manufactured other tube and solid state amplifiers, preamplifiers, radio tuners and bookshelf loudspeakers. Dynaco was liquidated in 1980, and the trademark is now owned by Radial Engineering Ltd. Early company history In 1950 David Hafler and Herb Keroes started a Philadelphia-based company called Acrosound to build and sell audio-quality output transformers, primarily for home electronics hobbyists. The two men refined and developed the ultra-linear audio circuit pioneered by British audio electronics engineer Alan Blumlein, using taps from the output transformer to feed signal back into the output stage screen grid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrovoice
Electro-Voice (EV) is an American manufacturer of audio equipment, including microphones, amplifiers, and loudspeakers, focused on pro audio applications such as sound reinforcement. As a subdivision of Bosch Communications Systems Inc. since 2006, Electro-Voice markets products for use by consumers as well as small or large concert venues, broadcasting, houses of worship, and in retail situations. History On September 1, 1927, Lou Burroughs and Albert R. Kahn began a small business called Radio Engineers, servicing radio receivers in the basement of the Century Tire and Rubber Company in South Bend, Indiana. Because of the Great Depression, according to Kahn, “We found ourselves insolvent to the extent of $5,000” ($ today). They decided to focus their business on audio products. The company designed a PA system for Notre Dame football coach Knute Rockne. Rockne, who had difficulty being heard at football practices due to health problems that affected his voice, called the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4 0 Channels (quadrophonic)(quadrophonie) Label
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vanguard Records
Vanguard Recording Society is an American record label set up in 1950 by brothers Maynard and Seymour Solomon in New York City. It was a primarily classical label at its peak in the 1950s and 1960s, but also has a catalogue of recordings by a number of pivotal jazz, folk, and blues musicians. The Bach Guild was a subsidiary label. The label was acquired by Concord Bicycle Music in April 2015. History The newly founded venture's first record was of J.S. Bach's 21st cantata, ''Ich hatte viel Bekümmernis'', BWV 21 ("I had much grief"), with Jonathan Sternberg conducting the tenor Hugues Cuénod and other soloists, chorus and orchestra. "What speaks for the Solomons' steadfastness in their taste and their task", wrote a '' Billboard'' journalist in November 1966, "is that this record is still alive in the catalogue (SC-501). As Seymour says, it was a good performance, not easy to top. Of the whole Vanguard/Bach Guild catalogue, numbering about 480 issues, 30 are Bach records..." ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Flame (The Flames Album)
''The Flame'' is a 1970 album released by South African band The Flames produced by Beach Boys member Carl Wilson. It's the only non-Beach Boys album to be released on their Brother Records label—albeit distributed by Starday-King Records as opposed to Reprise. According to Jerry Osbourne, "''The Flame'' is widely-regarded as the first quad LP." To avoid confusion with James Brown's band of the same name, the "s" on the Flames was dropped, but it was retained on South African pressings. Unlike previous Flames albums which contain covers, all eleven tracks are original, written by the band. Track listing As per label, all songs written by Fataar/Chaplin/Fataar/Fataar. #"See the Light" – 3:06 #"Make It Easy" – 3:06 #"Hey Lord" – 3:49 #"Lady" – 3:28 #"Don't Worry, Bill" – 3:17 #"Get Your Mind Made Up" – 4:10 #"Highs and Lows" – 4:49 #"I'm So Happy" – 3:17 #"Dove" – 2:18 #"Another Day Like Heaven" – 5:42 #"See the Light (Reprise)" – 1:28 Personn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Flames
The Flames was a musical rock group from Durban in South Africa. They performed across London in the late 1960s, where they met Brian Jones, Keith Moon, Keith Richards, Jerry Garcia, Miles Davis and Carl Wilson. They later traveled to Los Angeles to record an album for The Beach Boys' record label Brother Records, for which they changed their name to The Flame. Biography The Beginning of The Flames Prior to the forming of the band, Steve Fataar would enter talent contests at the Admiral hotel and do well. According to a friend of his, Bing Kinsey, "He continued entering these contests which put his mother in bit of a bother as she had to drive him there. I recall that on one occasion, Steve had heard a song by Cliff Richard just once – I’m not sure whether it was "Gee Whizz It's You" or " I'm Looking out the Window". I knew the song and taught it to him. That night he sang it at the talent contest and won." Eventually, Steve's brother, Edries Fataar, would join him. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
4 Dimensional Sound Demonstration
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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