In 1993, China used the principle of CD player and the MPEG-1 standard for digital image compression formulated by the International Group of Experts on Moving Pictures to compress audio and video on CD, making the first VCD player in the world. It was included by the World Record Association as the world's first VCD player, setting a world record. Because VCD discs are cheap, The rise of VCD in China soon made the application of laser digital video disc players in China enter the ranks of the world's major countries. In 1995, the world's top ten companies formed the DVD Alliance on the basis of higher multiples of digital compression technology MPEG-2, and formulated DVD disc standards in a unified manner. DVD player came out in 1996. DVD is the abbreviation of Digital Video Disc, which was later changed to Digital Versatile Disc, a digital multi-function disc. It is a series of products including various DVD disc recording and playing devices. The principle of DVD player is basically similar to that of VCD, except that the disc storage density is higher, the laser wavelength is shorter, the image definition and sound quality are better, and the projection time is longer. The research and development of EVD started in 1999. It is one of the first technologies to put forward the concept of high definition, EVD can be compatible with DVD, super VCD The pixels of VCD, CD, MP3 and other formats are nearly five times larger than those of DVD. It can record programs directly and record broadcast programs directly into CDs; It is completely compatible with computers. By connecting home appliances with computers, an information network within the family can be established. With the development of science and technology, ordinary definition DVDs can no longer meet the increasingly picky audiovisual friends, and high-definition double line video disc players have begun to appear on the stage. Its powerful double line function enables ordinary DVDs to release 1080P full high-definition effects. In addition to excellent video performance, audio effect is also a big selling point. 5.1 channel output is a basic requirement, and some disc players support 7.1 channel output, Both AC3 and DTS decoding can be supported.
The technology content of the DVD player is not very high, and the technology is quite mature, so it is not necessary to buy only from foreign big brands. Domestic brands (such as Bubu, etc.) are also acceptable (but if you want to buy a new Blu ray BD player, you'd better buy a foreign brand (Sony, etc.) When purchasing a DVD player, you need to consider these aspects: price, after-sales service, function, performance, decoding ability, region code compatibility, disk reading ability, whether the output interfaces are complete (including various audio, video interfaces, microphone interfaces, etc.), various practical functions, and in addition, shock and dust prevention. Pay attention to the following points in the maintenance of the DVD player: 1. Put the DVD player on a flat and solid surface, not on the carpet. 2. Do not put any weight on it. 3. Do not place objects (such as magazines) below. 4. To prevent being heated, do not put the DVD player on other equipment (such as TV or power amplifier). Put it in a well ventilated place, and there should be enough ventilation space on the left, right, front and back. 5. Do not put it in damp and dusty environment. 6. Do not put any dangerous goods on it. For example, objects containing liquid and burning candles. 7. Avoid "barbaric operation". The first VCD in the world was invented by several young scientists in Anhui in the 1980s. The invention of VCD finally sent the heavy video recorder and video tape to the grave, and created an unlimited industry. Unfortunately, these scientific and technological workers have not become the figures like Bill Gates who invented the Windows system, but their fame and contributions have long been lost with the passage of time. What we see now is that Chinese manufacturers, as the world's largest VCD and DVD production base, have to pay several dollars of patent royalties to foreign manufacturers for each VCD and DVD under the condition of extremely low profits or even losses. The first VCD in the world was invented by several young scientists in Anhui in the 1980s. The invention of VCD finally sent the heavy video recorder and video tape to the grave, and created an unlimited industry. Unfortunately, these scientific and technological workers have not become the figures like Bill Gates who invented the Windows system, but their fame and contributions have long been lost with the passage of time. What we see now is that Chinese manufacturers, as the world's largest VCD and DVD production base, have to pay several dollars of patent royalties to foreign manufacturers for each VCD and DVD under the condition of extremely low profits or even losses.