High fidelity

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For the novel, see High Fidelity (novel). For the film, see High Fidelity (film).

High fidelity or hi-fi reproduction is a quality standard that means the reproduction of sound or images is very faithful to the original. High fidelity aims to achieve minimal or unnoticeable amounts of noise and distortion. The term high fidelity tends to be applied to any reasonable-quality home-music system, though some believe that a higher standard than this was intended, and in 1973, the German Deutsches Institut für Normung (DIN) standard DIN 45500 laid down minimum requirements for measurements of frequency response, distortion, noise and other defects and gained some recognition in hi-fi magazines.

High-fidelity enthusiasts are often known as audiophiles. As the term hi-fi is today used generically, the luxury end of home audio electronics is often termed "high end."

1 History
2 Ascertaining high fidelity: double-blind tests
3 Semblance of realism
4 Modularity
5 Modern equipment
6 See also
7 External links

[edit] History

The 1920s saw the introduction of electronic amplification, microphones, and the application of quantitative engineering principles to the reproduction of sound. Much of the pioneering work was done at Bell Laboratories and commercialized by Western Electric. Acoustically-recorded disc records with capriciously peaky frequency response were replaced with electrically recorded records. The Victor Orthophonic phonograph, although purely acoustic, was created by engineers who applied waveguide technology to the design of the interior folded horn to produce a smooth frequency response which complemented and equalled that of the electrically recorded Victor Orthophonic records.

Meanwhile, the rise of radio meant increased popularity for loudspeakers and tube amplifiers, so there was an anomaly of a period of time during which radio receivers commonly used loudspeakers and electronic amplifiers to produce sound, while phonographs were still commonly purely mechanical and acoustic. Later, electronic phonographs became available, as stand-alone units or designed to play through consumer's radios. The now ubiquitous RCA connector was first introduced by the Radio Corporation of America for this purpose.

The development of Sound film in the 1930s led motion picture companies to develop amplification and loudspeaker systems to fill movie theaters with good quality sound at a reasonable volume. To achieve this result, they employed loudspeakers with separate sections for low and high frequencies ("woofers" and "tweeters"), connected via an audio crossover network, and more carefully engineered enclosures. This development exposed the public to better fidelity than home equipment was capable of at the time. Some movie stars purchased movie theater sound equipment for use in their homes but the cost was out of reach for anyone of modest means.

After World War II, several innovations created the conditions for a major improvement of home-audio quality:

Reel-to-reel audio tape recording, based on technology found in Germany after the war, helped musical artists such as Bing Crosby make and distribute recordings with better fidelity.
the advent of the 33⅓ RPM Long Play (LP) microgroove vinyl record, with low surface noise and quantitatively-specified equalization curves. Classical music fans, who were opinion leaders in the audio market quickly adopted LPs because, unlike with older records, most classical works would fit on a single LP.
FM radio, with wider audio bandwidth and less susceptibility to signal interference and fading than AM radio.
better amplifier designs, with more attention to frequency response and much higher power output capability, allowing audio peaks to be reproduced without distortion.

In the 1950s, the term high fidelity began to be used by audio manufacturers as a marketing term to describe records and equipment which were intended to provide faithful sound reproduction. While some consumers simply interpreted high fidelity as fancy and expensive equipment, many found the difference in quality between "hi-fi" and the then standard AM radios and 78 RPM records readily apparent and bought 33 LPs, such as RCA's New Orthophonics and London's ffrrs, and high-fidelity phonographs. Audiophiles paid attention to technical characteristics and bought individual components, such as separate turntables, radio tuners, preamplifiers, power amplifiers and loudspeakers. Some enthusiasts assembled their own loudspeaker systems. In the 1950s, hi-fi became a generic term, to some extent displacing phonograph and record player. Rather than "playing a record on the phonograph", people would "play it on the hi-fi".

In the late 1950s and early 1960s, the development of the Westrex single-groove stereophonic record led to the next wave of home-audio improvement, and in common parlance, stereo displaced hi-fi. Records were now played on a stereo. In the world of the audiophile, however, high fidelity continued and continues to refer to the goal of highly-accurate sound reproduction and to the technological resources available for approaching that goal. A very popular type of system for reproducing music from the 1970s onwards is the integrated music centre--the successor to the older stereogram or radiogram. Purists will generally avoid referring to these systems as high fidelity, though some are capable of very good quality sound reproduction.

[edit] Ascertaining high fidelity: double-blind tests

Double-blind testing has been required in the approval of new medicines since about 1960. Although single-blind testing of loudspeakers had been used for a number of years by Floyd E. Toole at the National Research Council of Canada, the double-blind audio listening test of amplifiers was first described in the United States by Daniel J. Shanefield in November of 1974 in the newsletter of the Boston Audio Society. This was later reported to the general public in High Fidelity magazine, March 1980. The double-blind listening comparison is now a standard procedure with almost all audio professionals respected in their field. For marketing purposes, a few manufacturers of very expensive audio equipment dispute the need for this test. A commonly-used variant of this test is the ABX-listening comparison. This involves comparing two known audio sources (A and B) with either one of these when it has been randomly selected (X). The test and its associated equipment was developed by the Southeastern Michigan Woofer and Tweeter Marching Society (SMWTMS) — a semi-professional organization in Detroit that is very active in the double-blind testing of new audio components.

An alternative view is that such testing is stressful, and perhaps because of this, is unable to distinguish the fine subtleties of top equipment; that only long-term listening will allow one to get to grips with its true sound — furthermore that proponents of double-blind testing have an agenda to discredit that such subtle differences exist, to claim that critics of double-blind testing are purely self-delusionary and victims of advertising hype. However, there is still another level of argument that maintains that all serious listening comparisons can be stressful. Also, listeners who paid an unusually large price for playback equipment might have a subconscious tendency to favor it. Therefore most professional audio testing uses double-blind comparisons.

Nevertheless, the double-blind methodology does not rule out a long-term test conducted at leisure in comfortable situations.

[edit] Semblance of realism

When high fidelity was limited to monophonic sound reproduction, a realistic approximation to what the listener would experience in a concert hall was limited. Researchers early realized that the ideal way to experience music played back on audio equipment was through multiple transmission channels, but the technology was not available at that time. It was, for example, discovered that a realistic representation of the separation between performers in an orchestra from an ideal listening position in the concert hall would require at least three loudspeakers for the front channels. For the reproduction of the reverberation, at least two loudspeakers placed behind or to the sides of the listener were required.

Stereophonic sound provided a partial solution to the problem of creating some semblance of the illusion of performers performing in an orchestra by creating a phantom middle channel when the listener sits exactly in the middle of the two front loudspeakers. When the listener moves slightly to the side, however, this phantom channel disappears or is greatly reduced. An attempt to provide for the reproduction of the reverberation was tried in the 1970s through quadraphonic sound but, again, the technology at that time was insufficient for the task. Consumers did not want to pay the additional costs required in money and space for the marginal improvements in realism. With the rise in popularity of home theatre, however, multi-channel playback systems became affordable, and consumers were willing to tolerate the six to eight channels required in a home theatre. The advances made in signal processors to synthesize an approximation of a good concert hall can now provide a somewhat more realistic illusion of listening in a concert hall.

In addition to spatial realism, the playback of music must be subjectively free from noise to achieve realism. The compact disc (CD) provides at least 90 decibels of dynamic range, which is about as much as most people can tolerate in an average living room. This therefore requires the playback equipment to provide a signal-to-noise ratio of at least 90 decibels. Many people can hear up to, at most, 15 kHz and for a few, up to 20 kHz. There is relatively little music below 50 Hz, loud bass below 30 Hz is rare, music below 16 Hz is almost non-existent, and music below 5 Hz is probably non-existent. (Incidentally, the cannons in Telarc's recording of Pyotr Tchaikovsky's 1812 Overture are said to go down to 5 Hz.) The equipment must also provide no noticeable distortion of the signal or emphasis or de-emphasis of any frequency in this frequency range. Except for spatial realism, good modern equipment can easily satisfy all of these requirements at a relatively moderate cost.

[edit] Modularity

Integrated, midi, or lifestyle systems contain one or more sources such as a CD player, a tuner, or a cassette deck together with a preamplifier and a power amplifier in one box. (Midi has no connection with MIDI technology in electronic instruments.) Such products are generally disparaged by audiophiles, although some high-end manufacturers do produce integrated systems. The traditional hi-fi enthusiast, however, will build a system from separates, often with each item from a different manufacturer specialising in a particular component. This provides the most flexibility for piece-by-piece upgrades.

For slightly less flexibility in upgrades, a preamplifier and a power amplifier in one box is called an integrated amplifier; with a tuner, it is a receiver. A monophonic power amplifier is a monoblock. Other modules in the system may include components like cartridges, tonearms, turntables, Digital Media Players, DVD players that play a wide variety of discs including CDs, CD recorders, MiniDisc recorders, hi-fi video-cassette recorders (VCRs), reel-to-reel recorders, equalizers, signal processors, and subwoofers.

This modularity allows the enthusiast to spend as little or as much as he wants on a component that suits his specific needs. In a system built from separates, sometimes a failure on one component still allows partial use of the rest of the system. A repair of an integrated system, though, means complete lack of use of the system. Another advantage of modularity is the ability to spend one's money on only a few core components at first and then later add additional components to one's system. Because of all these advantages to the modular way of building a high-fidelity system instead of buying an integrated system, audiophiles almost always assemble their system from separates. Some of the obvious disadvantages of this approach are increased cost, complexity, and space required for the components, not to mention the possibility of introducing noise via the interconnects between components.

[edit] Modern equipment

Modern hi-fi equipment usually includes signal sources such as CD players and Digital Audio Broadcasting (DAB) tuners, an amplifier, and loudspeakers. Some modern hi-fi equipment can be digitally connected using fiber optic and TOSLINK cables and can have universal serial bus (USB) ports and wireless fidelity (WiFi) support.

One modern component that is making fast gains in acceptance is the music server consisting of one or more computer hard drives that hold music in the form of computer files such as FLACs. When the said music is stored in an Audio file format that is lossless (such as FLAC or Monkey Audio), the opposite of lossy file formats such as MP3s, the computer playback of recorded audio can indeed serve as an audiophile-quality source for a hi-fi system.

If the hi-fi system includes components such as a projector, television, satellite decoder, DVD player, surround sound amplification and multi-channel loudspeakers, then it is often called home cinema or a home theatre system.

[edit] See also

[edit] External links

ABX Testing. Boston Audio Society.
Audio Links. Audio Engineering Society.
AudioWorld Hi-Fi Hi-Fi news and reviews.
Audio Links. Another large directory.
Audio Schematics and Design Plans. Hi-fi amplifier schematics and loudspeaker design plans for do-it-yourselfers.
Testing audio fidelity with absolute dynamic range
Dictionary of Home-Entertainment Terms. Detailed dictionary of high-fidelity and home-theatre terms.
Enjoy the Music.com - High-end audio equipment & music reviews, show reports, and educational information.
Stereo411.com Hi-fi reviews, dealers, and forum.
TNT-Audio Online Hi-Fi Review.
HiFi Discussion Forum (including reviews, glossary, links and photos)
Renato Giussani: Optimal Stereo Soundstage and Imaging (including very important evolutionary concepts)