What should we pay attention to when purchasing a DVD player as the audio and video source for home theaters?The author will soon list several things to pay attention to when choosing a DVD player:
1.Price
The common DVD players on the market are priced between 1000 and 2000 yuan,while mid-range players are generally priced between 3000 and 4000 yuan,while high-end players are around 10000 yuan,and"fever level"DVD players can cost as much as tens of thousands of yuan.However,if we go to big shopping malls,we can only find mid-range and low-end players,while high-end players can only be found at specialty stores or large electronics stores.Why is there such a big price difference?Mainly in terms of picture quality,sound quality,functionality,and quality differences.High end phones often have outstanding performance in both picture quality and sound quality,but the general mid to low end can already meet the needs of ordinary citizens.So before purchasing a DVD player,we must position the price well,because mid to low end DVD players have the most choices and are also the prices that citizens can most adapt to.
2.Function
Before choosing a DVD player,be sure to select what functions your DVD player needs.Because every DVD of different prices has some special features,such as line by line drawing,AC-3 decoding,DTS decoding,HDCD decoding,etc.DVDs generally already have multiple different functions,but it is important to remember the special features mentioned above,because every time such a feature is added,the cost of the DVD player itself increases significantly.So before choosing a reasonably priced DVD player,we need to first position its functions.If you are not familiar with the functions,it is best to purchase with friends who are familiar with DVD players.
3.Bald head
Another reasonable choice we need is the bald head used in the machine.DVD players are mainly represented by four types of optical heads:Toshiba(represented by single laser head dual focus),Sony and Hitachi(represented by dual laser head),Pioneer(represented by single laser head dual wavelength laser),and Panasonic(represented by single laser head single focus lens dual focus).As far as the author knows,many brands have chosen the single laser head dual wavelength laser method with Pioneer as the model,and it has now become mainstream.Its main advantage is that it is cheap and has fewer malfunctions.So we can confidently choose this kind of bald DVD player.
4.Chip
And what we need to pay attention to is the chip issue that our friends may not fully understand.In fact,current mid to low end DVD players use several mainstream chips such as C-Cube and ZiVA,while mid to high end players use chips from the famous American company Burr Brown in the audio circuit.For the selection of chips,we usually only focus on this issue when choosing high-end machines.Because low-priced machines have no overwhelming promotion,as they are all similar.Don't be fooled by the merchant's sweet words.
When choosing a DVD player,the last thing we need to consider is the DAC(digital to analog conversion)for audio and video.Most of the DVD players on the market are third-generation,with video DAC generally reaching 10bit/27MHz and audio DAC generally reaching 96kHz/24bit.For mid-range and low-end DVD players,these parameters are of course the higher the better.
5.Interlace and line by line
Interlace and line by line are both functions in DVD players.Some DVD players only come with interlaced scanning,while those with progressive scanning are backward compatible with interlaced scanning and have more chips that support progressive scanning,which is generally more expensive than those without progressive scanning.Nowadays,DVD players on the market are equipped with progressive scanning(PDVD)function,claiming that the image quality can be much clearer.At this point,you need to be careful because the commonly used televisions in households are interlaced scanning televisions.When using progressive scanning DVDs,the image quality and clarity are not very clear.So be careful when purchasing what TV the merchant is using to play.
6.Decoding
Another application is multi-channel decoding.Nowadays,most DVD players on the market come with AC-3 and DTS decoding,but there are also a small number of players that only have AC-3 and DTS outputs.These are two different concepts,and everyone must distinguish them clearly.Because having output does not necessarily mean having decoding,everyone must recognize the Peugeot on the machine clearly.Some machines only have AC-3 decoding without DTS decoding.Both are similar digital encoding and decoding standards,with the difference being the compression ratio used during encoding.Whether the DVD player has built-in decoding should be selected based on the equipment configuration.If the AV amplifier already has Dolby AC-3 decoding function,the DVD player does not need to have AC-3 decoding;If the DVD player is equipped with AC-3 decoding and the AV amplifier also has this function,it will cause functional waste.Due to DTS's unwillingness to sacrifice information capacity,it can only be used in movie software,so the DVD player chose the AV-3 system with less information content.Third generation DVD players generally come with DTS digital output and must be played back through an external DTS decoder or AV amplifier with DTS decoding.But it is difficult to find DVD discs encoded with DTS system in the market.As of now,the significance of whether a DVD player comes with a DTS digital decoding system is not significant.
7.Terminals
General audiovisual equipment is equipped with audio and video input and output terminals,and DVD players can output composite video signals through AV output terminals.In order to improve image quality,many audiovisual devices are equipped with a set of S-video input/output terminals,which use dedicated S-video transmission cables to separate the brightness and chromaticity signals and send them to the TV input terminal.This can reduce the loss of brightness and chromaticity signals and improve the horizontal clarity of the image.Some DVD players are also equipped with color difference component signal output terminals.
However,it must be pointed out that the color difference component output terminal of the DVD player must be connected to the color difference component input port of the television.If your TV has a color difference component input,you should try to choose a DVD player with color difference component output when purchasing.
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