FACTOID # 27: If you're itching to live in a trailer park, hitch up your home and head to South Carolina, where a whopping 18% of residences are mobile homes.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Hybrid SACD

Super Audio CD (SACD) is a new audio recording format aimed at providing higher fidelity audio reproduction than the compact disc. It was developed by Sony and Philips, the same companies that created the CD. Methods and media for sound recording are varied and have undergone significant changes between the first time sound was actually recorded for later playback until now. ... Image of a recordable compact disc (pencil included for scale) A compact disc (or CD) is an optical disc used to store digital data, originally developed for storing digital audio. ... Sony Corporation (Japanese katakana: ソニー) (NYSE: SNE) is a consumer electronics corporation based in Tokyo, Japan. ... Company logo Koninklijke Philips Electronics N.V. (Royal Philips Electronics), usually known as Philips, is one of the largest consumer electronics producers in the world. ...


Although the same physical size as the compact disc, SACD uses a different kind of digital audio signal, Direct Stream Digital (DSD). DSD is 1-bit and has a sampling rate of 2,822,400 Hertz. This gives the format a greater dynamic range and wider frequency response than the CD. At present there is some discussion as to whether 1-bit Sigma-delta modulation is suitable for high-quality audio Audio Engineering Society Convention Paper 5395 (http://sjeng.org/ftp/SACD.pdf). Image of a recordable compact disc (pencil included for scale) A compact disc (or CD) is an optical disc used to store digital data, originally developed for storing digital audio. ... Digital audio describes sound recording and reproduction systems which work by using a digital representation of the audio waveform. ... Direct-Stream Digital (DSD) is a technology to store audio signals on digital storage media and is used for the super audio compact disc (SACD). ... A bit (abbreviated b) is the most basic information unit used in computing and information theory. ... The hertz (symbol Hz) is the SI unit of frequency. ... Dynamic range is a term used frequently in numerous fields to describe the ratio between the smallest and largest possible values of a changeable quantity. ... Frequency response is the measure of any systems response to frequency, but is usually used in connection with electronic amplifiers and similar systems, particularly in relation to audio signals. ... In information theory, oversampling is the process of sampling a signal with a sampling frequency higher than the nyquist frequency. ...


At the optical level, SACDs are essentially DVD format, which is why inexpensive SACD-compatible DVD players are on the market. DVD is an optical disc storage media format that can be used for storing data, including movies with high video and sound quality. ...


While the frequency response of a normal CD is technically beyond the typical human's range of hearing, SACD offers an even wider response than CD does. For a consumer level format, it is probably much higher than necessary. However, for music mastering, and intermediate production, a wider frequency range can be advantageous.


SACD disks may contain a 2-channel stereo mix, a 5.1 surround sound mix, or both.


Hybrid SACDs are dual layer, with a CD layer (PCM digital audio/16 bits/44.1kHz) compatible with traditional CD players. Using noise shaped dithering, the hybrid disc's CD layer can approach up to 20-bit precision. This means if the format takes off retailers will be able to stock one title that is compatible with the installed base of CD players as well as new SACD players. The disks can also come in Dual Layer (two high density DSD layers) and Single Layer (single, high density DSD layer) versions, both of which are only playable on SACD compatible hardware. DualDisc is the DVD/CD hybrid that directly competes agains Hybrid SACDs, except they are double-sided instead of dual-layered. Pulse-code modulation (PCM) is a modulation technique. ... This article or section should be merged with Dithering Dither is a form of noise added to sample data for the purpose of minimizing quantization error. ... DualDisc Logo DualDisc is an optical disc format for storing digital data promoted by the RIAA. Essentially, DualDisc is a combination of a compact disc (CD) with a DVD, with one format on one side of the disc and the other on the opposite. ...


SACD also has copy prevention features at the physical level, which for the moment appear to make this format nearly impossible to perfectly copy. These include 80 bit encryption of the audio data, with a key encoded on a special area of the disk that is only readable by a licensed SACD device. SACD can't be played on a computer, nor can SACDs be created except by a licensed disc replication facility. Copying the music may still be done via an analogue stage (for example, line-out of the SACD player to the line-in of a CD recorder), but doing so is imperfect since the conversion to and from analogue is lossy and the target medium is not capable of storing the music with the fidelity of the source. Copy prevention, also known as copy protection, is any technical measure designed to prevent duplication of information. ... In cryptography, encryption is the process of obscuring information to make it unreadable without special knowledge. ... A lossy data compression method is one where compressing a file and then decompressing it retrieves a file that may well be different to the original, but is close enough to be useful in some way. ...


Currently, there appears to be a high resolution format war between Super Audio CD and DVD-Audio. Another promising challenger is the DualDisc format. A format war describes competition between competing media formats, usually very costly to the format-owning parties involved. ... DVD is an optical disc storage media format that can be used for storing data, including movies with high video and sound quality. ... DualDisc Logo DualDisc is an optical disc format for storing digital data promoted by the RIAA. Essentially, DualDisc is a combination of a compact disc (CD) with a DVD, with one format on one side of the disc and the other on the opposite. ...


At present SACD format has only taken the interest of audiophiles, with virtually no mainstream acceptance. Many reviews in "high-end" hi-fi magazines hold the opinion that SACD is a quantum improvement over CD; others claim that it does not meet the standards of a good Vinyl record played on high-end phonographic equipment (of course, that vinyl sounds better than even regular CD is contentious issue). Currently, the average person's stereo cannot play SACD, limiting its exposure. While mainstream consumers continue to choose a cheap and convenient format with "good enough" sound quality over a state of the art format, those looking for a rich audio experience that leverages popular home theater surround sound speakers may re-discover their passion for hi-fidelity audio lost during the so-called 'dark ages' of CD audio. An audiophile, most generally, is a lover of sound or music, but the word is more commonly used about someone who cares about hi-fi playback of sound recordings, rather than live performances. ... High Fidelity is also the title of a book by Nick Hornby and a film directed by Stephen Frears, based upon Hornbys book. ... 33⅓ LP vinyl record album The vinyl record is a type of gramophone record, most popular from the 1950s to the 1990s, that was most commonly used for mass-produced recordings of music. ...


See also

  • DVD-Audio

  Results from FactBites:
 
Nine Inch Nails Encyclopedia (1059 words)
Originally released in 1994, the new 2004 DELUXE EDITION includes 2 hybrid SACD/CDs: Disc One - The original album in SACD Surround Sound (remixed by Trent Reznor), and newly remastered SACD Stereo and CD Stereo program.
Disc Two - Bonus material (13 B-Sides, Remixes, and Rarities) in SACD Stereo and CD Stereo.
Learn more about this item in the Discography.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m