[DVD Player]What format does DVD player support? DVD player terminology and basic knowledge
A DVD with multiple reading formats, Just want any disc that can be read on your DVD player and played on a TV without sitting in front of a computer looking at a small screen.
There is currently no DVD capable of reading all formats. Not every format is commonly used. Therefore, when buying DVDs, it is best to choose according to your own needs, otherwise it will be a waste.
Let’s talk about these formats that DVD can read: MPEG1, MPEG2, MPEG4, EVD special format, HDV special format and FLASH are audio and video formats; MP3, WMA, CD track, MIDI, HDCD etc. are audio formats; KPG, JPEG, etc. are picture formats. Among these formats, which cannot be fully compatible are EVD-specific formats, HDV-specific formats, and FLASH and MIDI formats. The first two are the special formats of the manufacturer, or the high-definition format or the high-compression format. It is up to you to decide whether to choose. FLASH and MIDI formats are open animation and audio formats. Generally speaking, no long-length FLASH works are published and distributed on DVD discs. We rarely have the opportunity to actually carve short-length works into discs and watch them on an outhouse TV. . It is used to spread and does not necessarily have similar equipment in other people’s homes, so this advanced reading format does not make sense for everyone.
Basic knowledge of DVD players and related terms
There are currently more than 30 brands of DVD players on the market, with hundreds of models and more. Difficult to count accurately. How can consumers choose a DVD player with good value in the dazzling DVD market in the “overwhelming” DVD advertisements of “Wang Po sells melons”? Some basic knowledge of the DVD player:
First, the movement
The movement is the mechanical part of the DVD player, and it is the most critical part in the DVD player , it directly affects the normal use and life of the entire machine, and the most precious thing in the machine is the laser head – referred to as the bald head. There are basically 4 types of movement of DVD players on the market at present:
The first is the dual laser head (DUAL LASERS) movement, which has two laser heads. When the disc to be played enters, the reading mechanism first detects its format.
The second is the dual focus (DUAL FOCUS) movement, there is only one laser head in the machine. It adopts a dual-focus programming lens. When the disc to be played enters, the laser head emits different laser beams to automatically detect the disc, and then automatically select the corresponding focus point to read the signal according to the different disc specifications detected. That is to say, the single laser head of the double-focusing movement produces two focusing spots with different focal lengths at the same time, one of which is focused on the CD track and the other is focused on the DVD track, so as to play CD, VCD and DVD discs respectively.
The third type is the DUAL LENSES movement, and there is only one laser head in the machine, so it is also a single laser head movement. There are two lenses on the laser head, one of which is used to play CD or VCD, and the other is a special lens for playing DVD. The dual-lens movement uses a liquid crystal shutter switch to switch between different lenses. This kind of movement is easy to track accurately, but because of the double lens structure, the power of the laser beam must be increased, which affects the service life of the laser head, and the frequent replacement of the lens will also increase the mechanical failure rate.
The fourth type is the dual-laser movement. The dual-laser movement still uses only one laser head, but it installs two laser diodes in one laser head, and one of the laser diodes emits The 780nm (nanometer) laser beam for reading CD, VCD or CD-R discs, and the other laser diode emits a 650nm laser beam for reading DVD discs, so this dual-laser movement DVD In addition to being able to read CD-R, the model has a faster disc reading speed and a simpler structure, which reduces the mechanical failure rate and has a longer service life than the above two single-laser heads.
2. Standard
Like DVD video discs and color TVs, DVD video disc players also have various standard formats. At present, most DVD video discs on the market are NTSC. system, only a small part is PAL standard.
Three, Compatibility
The compatibility of a DVD player refers to the ability of how many discs it can play. At present, the laser discs in the audio-visual market generally include CD, LD, VCD, CVD, SVCD, DVCD, HDCD, CD-R, CD-RW and DVD.
Four.Upgrade function
The DVD player adds new functions without opening the cover, without changing the chip, and without using any instruments and meters , the user only needs to put a smart upgrade disc into the machine, and the whole upgrade process can be completed in less than one minute after starting the machine, so that the machine can obtain new functions and keep pace with DVD technology.
5. Color difference output function
Color difference output is also called DVD component video signal output or combined signal output, it uses 3 RCA terminals to output luminance signal respectively Y (high quality black and white signal) and color signals B?Y and R?Y.
Six, DTS function
DTS (Digital Theater System) is the meaning of digital theater system. Compared with Dolby Digital AC-3, the digital compression ratio of DTS stereo adopts a 4:1 format, while AC-3 adopts a 10:1 format. The smaller the compression ratio, the smaller the distortion, so the sound quality of DTS Much better.
7. Optical fiber and coaxial output
The optical fiber line is the TOSLINK?TOShiba LINK line, which is a technology developed by Japan’s Toshiba (TOSHIBA). An angle terminal on the back of the DVD player, the upper part is marked with OPTICAL, which is the optical output terminal. The optical fiber connection can achieve electrical isolation, prevent digital noise from being transmitted through the ground wire, and help improve the signal-to-noise ratio (S/N) of the DAC (digital-to-analog conversion). However, the signal connected by the optical fiber has to undergo two conversions between the transmitter and the receiver, which will cause a time base jitter error, which will affect the sound quality. Commonly used materials for optical fibers include plastics, quartz and glass, among which glass optical fibers have the best performance, but are expensive.
Eighth, AC-3 decoder
When the DVD player has built-in AC-3 decoder, there will be 6 A group of Dolby Digital (DOLBY DIGITAL) AC-3 output terminals composed of RCA terminals (the lotus sockets we are all very familiar with), this is the so-called 5?1 sound output channel. The 5 in 5?1 refers to the front left, center, front right and two surround channels, a total of 5 relatively independent channels, and 0?1 refers to the subwoofer channel.
Nine, Virtual Surround Sound
The virtual surround sound (also called analog surround sound) function enables the DVD player to connect with the TV or simple two When only the external speakers are connected, when playing DVD video discs, the circuit in the machine can effectively directional and mix the sound signal, so that the two front speakers can reproduce a virtual 5-channel surround sound, so that there is no sound. Families with a 5?1 channel system can still enjoy immersive sound effects.
10. Breakpoint memory playback function
DVD players with “breakpoint memory playback function” will automatically remember the current interrupted playback position. When the DVD disc is played again shortly afterward, the DVD player will automatically continue to play from the interruption point, saving the need to “start over from the beginning”, or use the fast-forward function or the time-selected playback function to find the original interruption point. It is very convenient for users, which is a very practical function.
Eleven. Status display function
Some DVD players have status display function. It will display the working status of the disc being played and its various data, such as the playing time, the remaining time of the disc, the number of chapters, the number of titles, the number of audio and subtitle languages, the type of recording encoding and the number of channels. And whether there is a multi-angle screen, etc., so that users can see the situation of the disc at a glance. Xiamen new DVD-8156 and other models have this “status display” function.
Twelve, user graphical interface function
GUI (Graphic User Interlace) user graphical interface function, it is a bit like the WINDOWS operating system, using visual icons Instead of the original full text display, the interface is more friendly, and the user can understand various operations at a glance, which is very convenient.
Thirteen, the child lock function
is also a very useful function, when the playing disc contains children such as violent murder, horror or pornography When there are inappropriate clips, the DVD player with the child lock function will automatically skip these pictures, thereby avoiding adverse effects on children.
Fourteen, automatic shutdown function
After a few minutes of shutdown, the machine will automatically cut off the power and shut down.
Above we have briefly introduced several important functions of DVD players. I believe that everyone has a basic understanding of the functions of DVD. Let’s learn about some important terms in detail below.
