Published: May 13, 2010 Source:8775.com Author:8775.com Hits:1101 CD stands for compact laserdisc and is a general term used for all CD media formats.
The CD formats that are available in the market today include Audio CD, CD-ROM, CD-ROM XA, Photo CD, CD-I and Video CD to name a few. Among this variety of CD formats, perhaps one of the most familiar is the Audio CD, which is a standard CD format for storing sound signal tracks such as music and songs.CD Digital Audio Signal (CDDA) was introduced by Sony and Philip during the 1980s as a form of music distribution. Because of the great success of audio CDs, today the use of this media has expanded to include data storage for the purpose of data archiving and delivery. Compared to a variety of traditional data storage media such as floppy disks and audiocassettes, CDs are best suited for storing large quantities of data, which may be any form or combination of computer files, audio signal data, photographic image files, software applications, and video data. the advantages of CDs include durability, convenience, and efficient cost.
VCD stands for Video Compact Disc.
The VCD standard was developed in 1993 by a consortium of appliance manufacturers, including Sony, Philips, JVC, and Panasonic, and is a white paper standard for digital optical disks.
Technical Specifications
VCD is a video standard for full-motion, full-screen playback. Its formats can be categorized as:
Resolution of 352x240 pixels, 29.97 frames per second (suitable for NTSC TV playback);
Resolution of 352x240 pixels, 23.976 frames per second;
Resolution of 352x288 pixels, 25 frames per second (suitable for PAL TV playback).
The full name of DVD, which was Digital Video Disc at its inception, is now known as Digital Versatile Disc. It is the successor to the CD/LD/VCD.
DVD, which took just over a year to develop from its initial specification in late 1994 to the appearance of prototypes in early 1996, is recognized by the entertainment industry as the next generation of standard storage technology. Moreover, the computer industry has responded very positively to it.
In the early nineties, the Motion Picture Industry Advisory Board drafted a wish list on behalf of the seven major Hollywood studios, and one of the items was a request to be able to record a standard-length (135-minute) video program on a single CD, and to require image and sound quality higher than that of an LD. Knowing that the image resolution of a VCD is only 352?40 (NTSC) or 352?88 (PAL), it is clear that the video performance alone could not satisfy these requirements. Given the influence of the Hollywood Film Group in the world's entertainment industry, hardware manufacturers have embarked on a new endeavor, and it can be argued that this is the impetus for the development of the DVD.
BD, has many meanings:
(1) It is an acronym for Bussiness Development. Translated into Chinese, it means Business Development
(2) Blu-ray Disc (BD) utilizes a blue laser with a short wavelength (405nm) to read and write data. laser to read and write data, and is so named. Whereas traditional DVDs require a red laser (with a wavelength of 650nm) from the optical head to read or write data, the shorter the wavelength of the laser in general, the more information can be recorded or read per unit area. As a result, Blu-ray greatly increases the storage capacity of optical disks, and for optical storage products, Blu-ray offers a jumpstart.
By far, Blu-ray is the most advanced high-capacity optical disc format, with huge advances in BD laser technology that allow you to store 25GB of document files on a single disc. That's 5 times more than existing (single-disc) DVDs. In terms of speed, Blu-ray allows 1 to 2 times or 4.5 to 9 megabytes per second recording speed.
Blu-ray discs have an exceptionally strong layer that protects the important recording layer inside the disc. Philips' Blu-ray Discs utilize an advanced vacuum link technology that creates a uniform 100?m thick security layer. Philips Blu-ray Discs can withstand frequent use, fingerprints, scratches and dirt, thus ensuring the security of the Blu-ray product's storage quality data.
(3)BD is one of the world's largest medical technology companies that manufactures and markets medical devices, medical systems and reagents, and is committed to improving the health of human beings around the world.BD focuses on improving drug therapy, improving the quality and speed of diagnosis of infectious diseases, and advancing the research and discovery of novel medicines and vaccines.BD has a strong research and development capability to fight against a wide range of the world's most troublesome diseases. BD has strong research and development capabilities to fight many of the world's toughest diseases. Founded in 1897 in New York City, the company is headquartered in Franklin Lakes, N.J., and employs more than 25,000 people in about 50 countries around the world.
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