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Topic: RIAA equalization

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	RIAA equalization - Wikipedia, the free encyclopedia
		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.
	en.wikipedia.org /wiki/RIAA_equalization (497 words)

	Recording Industry Association of America - Wikipedia, the free encyclopedia
		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.
	en.wikipedia.org /wiki/RIAA (1289 words)

	RIAA equalization -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		RIAA equalization is a specification for the correct playback of (Click link for more info and facts about vinyl record) vinyl records, established by the (Click link for more info and facts about Recording Industry Association of America) Recording Industry Association of America.
		The purpose of the (The act of making equal or uniform) 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.
		RIAA equalization is a form of (Click link for more info and facts about preemphasis) preemphasis on recording, and (Click link for more info and facts about deemphasis) deemphasis on playback.
	www.absoluteastronomy.com /encyclopedia/r/ri/riaa_equalization3.htm (645 words)

	riaa (Site not responding. Last check: 2007-10-21)
		The RIAA was formed in 1952 to administer the RIAA equalization curve, applied to vinyl records during cutting and playback.
		It is also argued against the RIAA argument that the postal system, the photographic film and camera makers, candy makers and public roads all help child pornography to be made and/or distributed, and that P2P is nothing new in that regard.
		According to the RIAA, if users do this, they will not be sued by the RIAA (others have noted that signing the statement doesn't prevent people being sued by the actual copyright-holders of the music, who are typically not the RIAA [3]).
	www.yourencyclopedia.net /RIAA.html (1446 words)

	RIAA (Site not responding. Last check: 2007-10-21)
		The RIAA has long contended that unregulated swapping of copyrighted music is 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 to halt the practice.
		The RIAA and its member groups argue that Internet distribution of music not only detrimentally affects the profits of their members, but the careers of current and future artists as well, due to possible stagnation of the music industry from lack of profitability.
	www.freecaviar.com /search.php?title=RIAA (946 words)

	wikien.info: Main_Page (Site not responding. Last check: 2007-10-21)
		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 has waged an aggressive legal campaign to halt the practice.
		The RIAA's claim conflicts with figures provided by Soundscan, the Nielsen company responsible for compiling the Billboard music charts, which suggest that US sales rose by 10% from 147 million in the 1st quarter of 2003 to 160 million in the 1st quarter of 2004.
		According to the RIAA, if users do this, they will not be sued by the RIAA (others have noted that signing the statement doesn't prevent people being sued by the actual copyright-holders of the music, who are typically not the RIAA) [link].
	www.alanaditescili.net /index.php?title=RIAA (1388 words)

	Page Title
		Unfortunately, more gain is needed, since the RIAA equalization imposed on the record decreases gain at the low frequencies by a factor of ten (-20 dB) relative to the mid-band frequencies.
		On the other hand, passive equalization is always stable and cannot be over-loaded; its disadvantage lies in the insertion loss and the frequency dependent load impedance it represents to the preceding stage.
		Consequently, the passive equalization stage is usually placed within two gain stages because it yields a preamp with both a good overload threshold and a fairly quiet output.
	www.glass-ware.com /tubecircuits/page3.html (457 words)

	Audio Gadgets: RIAA Equalization
		The sound transcribed onto a phono record's curves follows a special equalization curve so as to allow greater playback times (bass signals must be attenuated to conserve groove width) and lower high-frequency signal to noise ratios (high frequency signals must be accentuated to overwhelm the ticks and pops of a record's surface).
		At playback the reverse of the recording EQ curve must be employed to return the signal to a flat frequency curve.
		Passive RIAA equalization means brute force equalization: the frequency response is tailored to fit that of the RIAA curve by varying the amount of attenuation at different frequencies through a complex RC network.
	www.glass-ware.com /audiogadgets/AG_RIAA_Eq_Networks_Design.html (297 words)

	riaa backgrounder 1 - Introduction
		On the RIAA plot it is easy to see that the curve bends down at the 50Hz point, goes up at 500Hz and down again at 2122Hz.
		In the spreadsheet output above, clearly is shown the RIAA curve in blue and the asymptotic lines that are responsible for the curve: At 50 Hz, 6dB per octave, between 500 and 2122Hz a flat response and after 2122Hz the curve falls again with 6 dB per Octave.
		And of-course there is a third one in case of a RIAA filter; A mix of active and passive filtering is often used, where the lower frequencies are for example actively filtered and the 75 uSec pole passive.
	www.euronet.nl /~mgw/background/riaa/uk_riaa_background_1.html (1635 words)

	RIAA - The Matrix (Site not responding. Last check: 2007-10-21)
		The RIAA adduces as evidence statistics such as "Surveys in all major markets prove [file-sharing] is a major factor in the fall in world music sales, down 7% in 2003, and down 14% in three years.
		The RIAA's claim conflicts with figures provided by Soundscan, the Neilson company responsible for compiling the Billboard music charts, which suggest that US sales rose by 10% from 147 million in the 1st quarter of 2003 to 160 million in the 1st quarter of 2004.
		According to the RIAA, if users do this, they will not be sued by the RIAA (others have noted that signing the statement doesn't prevent people being sued by the actual copyright-holders of the music, who are typically not the RIAA [3] (http://cnet.com.com/2100-1027_3-5073972.html)).
	www.infoshop.org /octo/matrix/index.php?title=RIAA&printable=yes (1611 words)

	B2 Spice and RIAA Equalization (Site not responding. Last check: 2007-10-21)
		The real-world technique is to use an inverse RIAA equalization network in series with the phono preamp under test.
		A/D Spice, we can readily define the RIAA transfer function that was originally impose on the record as a standalone “fl box” function, distilling just the mathematical transfer function of the RIAA equalization.
		To test the accuracy of a preamp’s equalization, just place the inverse RIAA equalization transfer function in series with the circuit under test, either before or after.
	www.beigebag.com /case_riaa_2.htm (484 words)

	. . . :: Disc Recording Equalization Demystified by Gary A. Galo : : . . .
		This equalization is normally accomplished in the preamplifier, which also provides sufficient amplification of the relatively weak signal from the phono cartridge (which was known in the early days of electrical playback as the pickup, a term still used by the British).
		The principles of disc recording and playback equalization are the same whether the record is lateral, vertical, or 45/45 stereo.
		The RIAA, AES, NAB and Columbia IP playback characteristics are unacceptable for nearly all 78-rpm recordings.
	www.smartdev.com /RIAA.html (5306 words)

	DANIELS AUDIO (Site not responding. Last check: 2007-10-21)
		The Daniels Audio phase compensated RIAA equalization stage enables the record to retain most of the phase information of the original master tape.
		The equalization process used during the cutting of a record introduces a known phase and amplitude compensation at each frequency.
		The phase compensated RIAA equalization introduces, in addition to the inverse amplitude compensation, a phase shift which is roughly the opposite of that introduced during the recording process.
	www.danielsaudio.com /preamp_phono.htm (502 words)

	Plug phonograph jack into only phonograph inputs
		RIAA stands for Recording Industry Association of America, and equalization is a process applied to the signal coming from the phono cartridge to correct it.
		The RIAA equalization process corrects this so the music is reproduced correctly.
		The preamp will apply RIAA equalization and increase the voltage so your turntable will work with a line level input on your receiver.
	www.post-gazette.com /interact/20030220lindich0220p1.asp (606 words)

	Page Title
		The equipment manufacturers tried to keep up with all the different equalization curves and build playback circuits with curves that would make their own equipment sound "good".
		In 1955 the Recording Industry Association of America published a new standard equalization curve that was adopted by the entire industry of record and audio equipment makers.
		Surely the equipment makers today have adopted the RIAA standard and built the correct playback curve into their gear?" The short answer is, probably they have.
	www.graniteaudio.com /phono/page5.html (1107 words)

	EB-804/419 ALL-JFET MM/MC Phono Preamp "Starter Kit"
		Here both amplifiers are providing flat frequency response and all RIAA equalization is done passively between the two amplifiers.
		Since the DC gain of the circuit can be very high (MC application and/or all-passive equalization), I am using a servo circuit instead of capacitive coupling to keep the offset close to zero volt.
		As the all-passive equalization network has a high insertion loss (~20dB), the gain of the two amplifiers has to be increased to get the same overall gain.
	www.borbelyaudio.com /eb804419.asp (678 words)

	78 RPM and RIAA Preamplifier
		To compensate for the cutting equalization, it is necessary to do the opposite when you play back the records, and that’s why you use a RIAA input.
		The cutting equalizations on all 78 RPMs and LPs before 1955 have been very different, and specially, the 78 RPM curves are very different from the RIAA eq curve.
		It can therefore be seen that playing a 78 with RIAA equalization - all that is available to many people - produces far less top than is correct - particularly for the earliest electrical, where the result is akin to turning the treble control right down.
	www.vadlyd.dk /English/RIAA_and_78_RPM_preamp.html (3162 words)

	Diamond Cut User Forum - "DJ" turntables and digital output
		As with all RIAA implementations done with resistors and caps, there are imperfections in the RIAA curve - likely small, but a real analysis would be hard since you'd have to do it without a cartridge.
		Playing a 78 RPM record through an RIAA pre-amp circuit will tend to sound "dull" on the top end of the spectrum and the bass could sound either too heavy or too light depending on the brand of record.
		Reverse the RIAA Curve using said curve in the Paragraphic EQ and then apply the appropriate Turnover frequency for the brand of record.
	www.diamondcut.com /vforum/printthread.php?t=1257 (2038 words)

	B2 Spice RIAA Equalization
		The inverse of the RIAA curve returns the signal to flat by cutting the highs and boosting the bass.
		Active equalization overcomes the problems of loose tolerances and part aging (assuming that the equalization parts are high quality, i.e.
		On the other hand, passive equalization cannot not be voltage overloaded nor can it bring the preamp to oscillation.
	www.beigebag.com /case_riaa_1.htm (441 words)

	The Tube CAD Journal: RIAA EQ Preamplifiers
		means the frequency response is tailored to fit that of the RIAA curve by varying the amount of the feedback signal returned to the input (i.e.
		The alternative to active equalization is passive equalization.
		In the topmost circuit we see the approach of using two gain stages with one complete RIAA equalization network in between.
	www.tubecad.com /articles_2002/RIAA_Preamps_Part_2 (379 words)

	RJM Audio Cable - Basic Phono Preamplifier
		The RIAA equalization is done within the feedback loop.
		With an adapter board, available here the two surface mount AD825s can be made pin compatible with a standard DIP socket and dual op-amp pin connection.
		In principle the RIAA response calls for the high frequency attenuation to fall off at 6 dB per octave, so at some point the amp cannot provide sufficient attenuation to properly track the response.
	www.geocities.com /rjm003.geo/rjmaudio/diy_pho5.html (1121 words)

	Jeremy Epstein's 6C45P Phono Preamp page (Site not responding. Last check: 2007-10-21)
		The derivation of the filter component values for a two-stage (split) passive RIAA equalization network is shown below.
		One problem with this circuit is that it is somewhat difficult to adjust the filter values to an accurate RIAA equalization - a very small change in resistor values makes a somewhat large change in the response and the sound.
		For the first section, with 75 and 3.18 uS time constants, we assume that the two filter constants are far enough apart that their interaction need not be taken into account.
	home.earthlink.net /~jeremyepstein/6c45riaa.html (2260 words)

	USB-Powered High Precision Hi-Fi Phono Preamp - Maxim/Dallas
		A quad, low-noise, op amp and LDO are used to build a stereo preamp with RIAA equalization to allow converting signals from a record player (phonograph) to a linear output for digitizing by computer sound cards etc.
		A phono preamp is needed for preamplifying and equalization the analog output of the good old record player.
		Some deviation from the ideal RIAA equalization curve will occur if these caps are too far from the designated values (see my test).
	www.maxim-ic.com /appnotes.cfm/appnote_number/1931 (478 words)

	Welcome to my web page (Site not responding. Last check: 2007-10-21)
		First, it’s been discovered by Wright [2] that the actual equalization curve used by the Neumann cutting lathe has an additional time constant not specified by the RIAA curve.
		There are two categories of circuit design errors that could lead to RIAA equalization accuracy errors.
		The total equalization error is shown in blue, while the op-amp-induced errors are shown in green.
	home.comcast.net /~andy_c_public (3952 words)

	Benz Series 2 PP-1 Phono Stage
		Within the RIAA network, only 1% polystyrene capacitors have been used, with high quality metalized plastic-film capacitors in the coupling function.
		As with the input amplifier, RIAA equalization has been achieved through an inverting 2-stage amplifier of ultra high accuracy (+0/-.5dB within the RIAA standard).
		Lukaschek finds this new regulator, in conjunction with his polarity inverting RIAA filter, yields reduced distortion and a more exact implementation of the RIAA equalization curves.
	www.musicalsurroundings.com /pp1.html (653 words)

	Products: Turntables, Tonearms Cartridges & Accessories: Accessories -- Hollywood Sound
		The EF1 is a separate phono equalization preamplifier, designed to provide the added gain and RIAA equalization required by modern phono cartridges.
		The EV1 is a separate phono equalization preamplifier designed to provide the additional gain and RIAA equalization that modern phono cartridges require.
		Designed to precisely track the prescribed RIAA equalization curve, the Premier Fifteen assures absolute tonal accuracy High gain circuits, carefully engineered for low noise, accommodate a wide range of moving coil and moving magnet cartridges.
	www.hwdsound.com /products/product_Accessories.htm (2468 words)

	The Tube CAD Journal: A Different Approach RIAA Equalization
		Another possible variation would be to use two gain stages, with the shelving half of the equalization network in between the two gain stages and the 2122-Hz RC low-pass filter following the output.
		Still, this configuration would greatly reduce the preamp's output noise as it equalizes the signal, as whatever noise is present above 2122 Hz, no matter its cause, would also be attenuated by the final equalization network.
		Notice how close the inverse RIAA equalization curve is to a 50 Hz low-pass filter, excepting the flattening at 1 KHz.
	www.tubecad.com /articles_2002/RIAA_Preamps_Part_2/page12.html (258 words)

	Line level to phono input
		That RIAA equalization is used in the playback to reduce the high pitch noise and maximize bass dynamics in the phono playback.
		The audio material which is rocorded to the record has been pre-equalized so that the frequency response of the whole chain from the mixing desk to your speaker will give flat frequency response.
		These inputs have no RIAA EQ (ceramic pickups are amplitude-sensitive, and the RIAA curve produces (very) roughly a constant-amplitude cut).
	www.epanorama.net /circuits/phono.html (847 words)

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