Vcd Chinese full name: video high-density (audio-visual) CD
The full name of Dvd in English is DVD, which is a digital video disc, that is, digital video disc or digital video disc. It uses the compression technology of MPEG2 to store images. Some people also call DVD a digital multifunctional disk, which integrates computer technology, optical recording technology and film and television technology to meet people's demand for large storage capacity and high performance storage media. DVD is not only widely used in audio/video field, but also will promote the development of publishing, broadcasting, communication, WWW and other industries.
LD is an audio-visual format, and its most obvious feature is that its disk surface is very large, as big as an old turntable, with high definition. More than dvd, but the price is too high, which is not conducive to promotion.
MP3 is the most popular music format on the Internet, which originated from the digital transmission scheme of147 of a German company in 1987. It adopts the technology of MPEGAODIOLayer 3, and compresses the sound file into a music file with a compression ratio of about 1∶ 12, which makes the transmission and storage more convenient and more conducive to online listening or downloading by netizens.