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Encyclopedia > RIAA equalization
The RIAA equalization curve for playback of vinyl records.
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The RIAA equalization curve for playback of vinyl records.

RIAA equalization is a specification for the correct playback of vinyl records, established by the Recording Industry Association of America. The purpose of the equalization is to permit greater playback times, improve sound quality, and to limit the physical extremes that would otherwise arise from recording analogue records without such equalization. Image File history File links RIAA-EQ-Curve. ... Image File history File links RIAA-EQ-Curve. ... A gramophone record, (also phonograph record - often simply record) is an analog sound recording medium: a flat disc rotating at a constant angular velocity, with inscribed spiral grooves in which a stylus or needle rides. ... The RIAA Logo. ... It has been suggested that this article or section be merged with Equalization filter. ...


The RIAA equalization curve has operated as a de facto global industry standard for the recording and playback of vinyl records since 1954. Prior to that time - mainly between 1940 and 1954 - each record company applied its own equalization; there were over 100 combinations of turnover and rolloff frequencies in use, the main ones being AES, LP, NAB and FFRR. The RIAA Logo. ... De facto is a Latin expression that means in fact or in practice. It is commonly used as opposed to de jure (meaning by law) when referring to matters of law or governance or technique (such as standards), that are found in the common experience as created or developed without... Standardization or standardisation (sometimes abbreviated s13n), in the context related to technologies and industries, is the process of establishing a technical standard among competing entities in a market, where this will bring benefits without hurting competition. ... 1954 (MCMLIV) was a common year starting on Friday of the Gregorian calendar. ...


Before 1940, most records were cut flat, with a low-pass turnover of 6 dB/octave below 300 Hz to 800 Hz. This included broadcast recordings (transcriptions) and motion picture recordings before sound-on-film. If you play a pre-WWII 78rpm record through a modern preamp, you will effectively be playing it with a scratch filter whose cutoff begins at 2200 Hz, giving lack of high frequencies and muffled voices. The decibel (dB) is a measure of the ratio between two quantities, and is used in a wide variety of measurements in acoustics, physics and electronics. ... Combatants Major Allied powers: United Kingdom Soviet Union United States Republic of China and others Major Axis powers: Nazi Germany Italy Japan and others Commanders Winston Churchill Joseph Stalin Franklin Roosevelt Harry Truman Chiang Kai-Shek Adolf Hitler Benito Mussolini Hideki Tojo Casualties Military dead: 17,000,000 Civilian dead...


RIAA equalization is a form of preemphasis on recording, and deemphasis on playback. A record is cut with the low frequencies reduced and the high frequencies boosted, and on playback the opposite occurs. The result is a flat frequency response, but with noise such as hiss and clicks arising from the surface of the medium itself much attenuated. The other main benefit of the system is that low frequencies, which would otherwise cause the cutter to make large excursions when cutting a groove, are much reduced, so grooves are smaller and more can be fitted in a given surface area, yielding longer playback times. This also has the benefit of eliminating physical stresses on the playback stylus which might otherwise be hard to cope with, or cause unpleasant distortion. In processing electronic audio signals preemphasis refers to a system process designed to increase, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse... In telecommunication, deemphasis is a system process designed to decrease, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of other (usually lower) frequencies in order to improve the overall signal-to-noise ratio by minimizing the adverse effects of such phenomena... Sine waves of various frequencies; the bottom waves have higher frequencies than those above. ... Reduction of signal strength during transmission. ... Modern stylus, used for touch-screen enabled devices such as the Nintendo DS and personal digital assistants Styli used in writing in the Fourteenth Century. ... A distortion is the alteration of the original shape (or other characteristic) of an object, image, sound, waveform or other form of information or representation. ...


A drawback of the system is that rumble from the playback turntable's drive mechanism is greatly amplified, which means that players have to be carefully designed to avoid this. Edison cylinder phonograph ca. ...


RIAA equalization is not a simple low-pass filter. It carefully defines transition points in three places - 75 µs, 318 µs and 3180 µs, which correspond to 2122 Hz, 500 Hz and 50 Hz. Implementing this characteristic is not especially difficult, but more involved than a simple linear amplifier. The phono input of most hi-fi amplifiers have this characteristic built-in, though it is omitted in many modern designs due to the gradual obsolescence of vinyl records. A solution in this case is to buy a special preamplifier which will adapt a magnetic cartridge to a standard line-level input, and implement the RIAA equalization curve separately. Some modern turntables feature built-in preamplification to the RIAA standard. Special preamps are also available for the various equalization curves used on pre-1954 records. The hertz (symbol: Hz) is the SI unit of frequency. ... The word linear comes from the Latin word linearis, which means created by lines. ... Generally, an amplifier is any device that uses a small amount of energy to control a larger amount of energy. ... High Fidelity is also the title of a book by Nick Hornby and a film directed by Stephen Frears, based upon Hornbys book. ... A magnetic cartridge is a device used for the playback of gramophone records on a turntable or phonograph. ... Line level is a term used to denote the strength of an audio signal used to transmit analog sound information between audio components such as CD and DVD players, TVs, amplifiers, and mixing consoles. ...


External links

  • Digital RIAA EQ curve + cable diagram of how to connect a turntable to an XLR mic-pre input (P. 31)
  • Description and diagrams of RIAA equalization curve

  Results from FactBites:
 
RIAA equalization - Wikipedia, the free encyclopedia (497 words)
RIAA equalization is a specification for the correct playback of vinyl records, established by the Recording Industry Association of America.
The RIAA equalization curve has operated as a de facto global industry standard for the recording and playback of vinyl records since 1954.
RIAA equalization is a form of preemphasis on recording, and deemphasis on playback.
Recording Industry Association of America - Wikipedia, the free encyclopedia (1289 words)
Primary goals of the RIAA are to lobby congress, negotiate policy with other industries (such as technology developers, recording and play-back device manufactuers, etc.) and to influence the perceptions and social behavior of consumers via the media on behalf of its constituent members.
The RIAA has long contended that sharing of copyrighted music was a form of piracy, applying the well-known computing term to music.
Hilary Rosen, the RIAA's president and chief executive officer from 1988 to 2003, was an outspoken critic of peer to peer file sharing, and under her direction, the RIAA waged an aggressive legal campaign trying to halt the practice.
  More results at FactBites »

 
 

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