This is in contrast to the lower quality sound produced by inexpensive audio equipment, AM radio, or the inferior quality of sound reproduction that can be heard in recordings made until the late 1940s. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency response within the [hearing range]. == History == Bell Laboratories began experimenting with a range of recording techniques in the early 1930s.
During the 1930s, Avery Fisher, an amateur violinist, began experimenting with audio design and acoustics.
Performances by Leopold Stokowski and the Philadelphia Orchestra were recorded in 1931 and 1932 using telephone lines between the Academy of Music in Philadelphia and the Bell labs in New Jersey.
Performances by Leopold Stokowski and the Philadelphia Orchestra were recorded in 1931 and 1932 using telephone lines between the Academy of Music in Philadelphia and the Bell labs in New Jersey.
Some multitrack recordings were made on optical sound film, which led to new advances used primarily by MGM (as early as 1937) and Twentieth Century Fox Film Corporation (as early as 1941).
This is in contrast to the lower quality sound produced by inexpensive audio equipment, AM radio, or the inferior quality of sound reproduction that can be heard in recordings made until the late 1940s. Ideally, high-fidelity equipment has inaudible noise and distortion, and a flat (neutral, uncolored) frequency response within the [hearing range]. == History == Bell Laboratories began experimenting with a range of recording techniques in the early 1930s.
Some multitrack recordings were made on optical sound film, which led to new advances used primarily by MGM (as early as 1937) and Twentieth Century Fox Film Corporation (as early as 1941).
RCA Victor began recording performances by several orchestras using optical sound around 1941, resulting in higher-fidelity masters for 78-rpm discs.
In the 1950s, hi-fi became a generic term for home sound equipment, to some extent displacing phonograph and record player. In the late 1950s and early 1960s, the development of stereophonic equipment and recodings led to the next wave of home-audio improvement, and in common parlance stereo displaced hi-fi.
In the 1950s, hi-fi became a generic term for home sound equipment, to some extent displacing phonograph and record player. In the late 1950s and early 1960s, the development of stereophonic equipment and recodings led to the next wave of home-audio improvement, and in common parlance stereo displaced hi-fi.
Many transistor amps use MOSFET devices in their power sections, because their distortion curve is more tube-like. A popular type of system for reproducing music beginning in the 1970s was the integrated music centre—which combined a phonograph turntable, AM-FM radio tuner, tape player, preamplifier, and power amplifier in one package, often sold with its own separate, detachable or integrated speakers.
Purists generally avoid referring to these systems as high fidelity, though some are capable of very good quality sound reproduction. Audiophiles in the 1970s and 1980s preferred to buy each component separately.
An attempt to provide for the reproduction of the reverberation was tried in the 1970s through quadraphonic sound.
JVC, Pioneer Corporation, Sony and Toshiba also began manufacturing amplifiers with power MOSFETs in 1974.
In 1977, Hitachi introduced the LDMOS (lateral diffused MOS), a type of power MOSFET.
Hitachi was the only LDMOS manufacturer between 1977 and 1983, during which time LDMOS was used in audio power amplifiers from manufacturers such as HH Electronics (V-series) and Ashly Audio, and were used for music and public address systems.
John Atkinson, current editor of Stereophile, stated that he once purchased a solid-state amplifier, the Quad 405, in 1978 after seeing the results from blind tests, but came to realize months later that "the magic was gone" until he replaced it with a tube amp.
Purists generally avoid referring to these systems as high fidelity, though some are capable of very good quality sound reproduction. Audiophiles in the 1970s and 1980s preferred to buy each component separately.
In the 1980s, a number of audiophile magazines became available, offering reviews of components and articles on how to choose and test speakers, amplifiers, and other components. == Listening tests == Listening tests are used by hi-fi manufacturers, audiophile magazines, and audio engineering researchers and scientists.
Hitachi was the only LDMOS manufacturer between 1977 and 1983, during which time LDMOS was used in audio power amplifiers from manufacturers such as HH Electronics (V-series) and Ashly Audio, and were used for music and public address systems.
Robert Harley of The Absolute Sound wrote, in 2008, that: "...blind listening tests fundamentally distort the listening process and are worthless in determining the audibility of a certain phenomenon." Doug Schneider, editor of the online Soundstage network, refuted this position with two editorials in 2009.
Robert Harley of The Absolute Sound wrote, in 2008, that: "...blind listening tests fundamentally distort the listening process and are worthless in determining the audibility of a certain phenomenon." Doug Schneider, editor of the online Soundstage network, refuted this position with two editorials in 2009.
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