VCD stands for Video Compact Disc.The VCD standard was developed in 1993 by a consortium of appliance manufacturers, including Sony, Philips, JVC, Panasonic, and others, 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 the time of its inception, is now known as "Digital Versatile Disc", which means "Digital Versatile Disc". As the successor to the CD/LD/VCD, DVD has evolved rapidly from its initial specification in late 1994 to the appearance of prototypes in early 1996, and 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 VCD is only 352 x 240 (NTSC) or 352 x 288 (PAL), it is obvious that the video performance alone cannot meet the above requirements. Given the influence of the Hollywood Film Group in the world of entertainment, hardware manufacturers have begun a new effort, which can be said to be the impetus for the development of DVD.
BD, which has a variety of meanings
(1) is an acronym for Bussiness Development. Translated into Chinese, it means Business Development
(2) Blu-ray Disc, or BD, utilizes a blue laser with a short wavelength of 405 nm 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 provides an opportunity to jump-start development.
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 are designed to withstand frequent use, fingerprints, scratches and dirt, thus ensuring the security of Blu-ray products' 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 research and discovery of novel drugs and vaccines.BD has strong research and development capabilities to fight the world's most intractable and diverse diseases. BD has strong research and development capabilities to fight many of the world's toughest diseases. Founded in 1897 in New York City and headquartered in Franklin Lakes, New Jersey, the company employs more than 25,000 people in approximately 50 countries. The Company serves medical institutions, life science research institutes, clinical laboratories, industrial units and the general public