posted 05-05-2015 01:55 PM                    

quote: Audiophile Magazine ELP Turntable Review Excerpt

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However, what the ELP giveth in convenience with one hand, it more than taketh away with the other. Unlike a relatively massive diamond stylus, which plows through a record’s grooves like the prow of a ship, the ELP’s tiny laser-beam styli have next to no mass and cannot move dust particles out of their way. Any speck of dirt, however minute, is read by the lasers along with the music. In his review of the ELP in Stereophile, Michael Fremer compared the playback of an uncleaned record to the sound of someone munching potato chips. That’s a pretty accurate description.

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posted 05-05-2015 04:11 PM                       

quote:

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In 2014, the technology was made available for the first time outside the laboratory.

“The fear all along is that we don’t want to damage these records. We don’t want to put a stylus on them,” said Jerry Fabris, the curator of the Thomas Edison Historical Park in West Orange, N.J. “Now we have the technology to play them safely.”

Last month, the Historical Park posted online three never-before-heard Edison doll recordings, including the two from the Rolfses’ collection. “There are probably more out there, and we’re hoping people will now get them digitized,” Mr. Fabris said.

The technology, which is known as Irene (Image, Reconstruct, Erase Noise, Etc.), was developed by the particle physicist Carl Haber and the engineer Earl Cornell at Lawrence Berkeley. Irene extracts sound from cylinder and disk records. It can also reconstruct audio from recordings so badly damaged they were deemed unplayable.

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posted 05-07-2015 08:56 AM                    

quote: Mike Blakesley

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I always wanted to try this experiment: Take a CD recording and add just a slight touch of "surface noise" and the occasional tiny click and pop type sounds to it. Then blindfold one of those golden-eared "audiophiles" and tell him he's going to hear an CD followed by a LP, and to state which sounds better. Then play the altered recording followed by the unaltered one and watch him gush about how much "warmer" the "LP's" sound is.

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posted 05-11-2015 12:11 PM                    

quote: From Wikipedia

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History

William K. Heine presented a paper entitled A Laser Scanning Phonograph Record Player to the 57th Audio Engineering Society (AES) convention in May 1977. The paper details a method developed by Heine that employs a single 2.2 mW Helium–neon laser for both tracking a record groove and reproducing the stereo audio of a phonograph in real time. In development since 1972, the working prototype was named the "LASERPHONE" and the methods it used for playback was awarded U.S. Patent 3,992,593 on 16 November 1976. Heine concluded in his paper that he hoped his work would increase interest in using lasers for phonographic playback.

Finial Technology

Four years later Robert S. Reis, a graduate student in engineering at Stanford University, wrote his master's thesis on "An Optical Turntable". In 1983 he and fellow Stanford electrical engineer Robert E. Stoddard founded Finial Technology to develop and market a laser turntable, raising $7 million in venture capital. In 1984 servo-control expert Robert N. Stark joined the effort.

A non-functioning mock-up of the proposed Finial turntable was shown at the 1984 Consumer Electronics Show (CES), generating much interest and a fair amount of mystery, since the patents had not yet been granted and the details had to be kept secret. The first working model, the Finial LT-1 (Laser Turntable-1), was completed in time for the 1986 CES. The prototype revealed an interesting flaw of laser turntables: they are so accurate that they play every particle of dirt and dust on the record, rather than pushing them aside as a conventional stylus would. The non-contact laser pickup does have the advantages of eliminating record wear, tracking noise, turntable rumble and feedback from the speakers. The projected $2500 street price (later raised to $3786 in 1988) limited the potential market to professionals (libraries, radio stations and archivists) and a few well-heeled audiophiles.

Unfortunately for Finial, the laser turntable development exactly coincided with both a major economic recession and the perfection and introduction of the Digital Compact Disc, which soon began flooding the market at prices comparable to LPs (with CD players in the $300 range). Vinyl record sales plummeted, and many existing turntable manufacturers went out of business as a result.

The Finial turntable never went into production. After a few hand-built (and finicky) prototypes were completed and shown, tooling delays, component unavailability (in the days before cheap lasers), marketing blunders, and high development costs kept pushing back the release date. With over US$20 million in venture capital invested, Finial was faced with a dilemma: to forge ahead with a selling price that was too high for most consumers, or to gamble on going into mass production at a much lower price and hoping the market would lower costs.

ELP

In late 1989 Finial's investors finally cut their losses and liquidated the firm, selling the patents to Japanese turntable maker BSR, which became CTI Japan which in turn created ELP Japan for continued development of the "super-audiophile" turntable. After eight more years of development the laser turntable was finally put on sale in 1997 as the ELP LT-1XA Laser Turntable, with a list price of US$20,500 (in 2003 the price was lowered to US$10,500). The turntable, which uses two lasers to read the groove and three more to position the head, does allow one to vary the depth at which the groove is read, possibly bypassing existing record wear. It will not, however, read clear or colored vinyl records.

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