Re: ? Is CD Player really make difference over DVD Player for Stereo Listening?? nvas
i must respectfully disagree.
Good, I am quite happy that someone has reacted.
1. DVD has more Data density, meaning more pits/sqcm. If a DVD player Laser can read more pits/sqcm, how can it miss pits on a CD which has less pits/sqcm?
Simply because the way the head positions itself for and moves depends upon pits per sq.cm. In a CD player, the head is programmed is read a fixed number of pits per sq.cm. In a DVD player, the read head has to align itself differently every time you change the media. Since we are talking about very small movements related to the speed at which the media is rotating, there is always a chance of an error. This can of course be avoided if very high quality parts are used, and the head make a few sample runs till it aligns itself properly. This is never done in a DVD player.
If you have used EAC on a computer, you will see that it has a database of drive offset for literally every drive in the world. It compares this with the offset it is getting from your drive and then calculates what is the accuracy of the reading. This is also compounded by the fact that most CDs have scratches and that could lead to more errors. EAC forces the drive to read upto 20 times the same track and sector, before it is happy with the data. Essentially this is done by simply comparing the read with a 'perfect' read that it has on a database.
2. All CD/DVD players can be divided into 3 basic parts: a) Drive b) DAC c) the power supply. Interference can be generated by Drive motor and Power supply in both cases.
True, by a DVD payer has additional electronics for video reading as well as video decoding. Even for audio, a DVD player has to contend with upto 8 channels, while a CD player is worried only about two channels. Some DVD players have separate shielded circuitry for two channel, but that shoots the cost up. In addition, given the size of DVD players, the electronics are are all compacted together in a smaller space.
When playing a DVD it really does not matter as I said the player, in most cases, sends the digital data out for external processing. But if you want the player to process the data internally and send analogue out, you have to contend with all the noise, DAC, and other issues.
3. Both DVD Player and CD player have to have a DAC. Also DAC of a typical DVD player will be 24 bit, 192 kHz vs 16 bit, 44.1 KHz of a CD Player (Due to DVD and CD recording standards)
True, but the quality of DAC will depend upon which DAC chip is used and a number of processing standards. DAC chips from companies such as Burr Brown, Analog Devices etc are expensive and these are never used on mass market DVD Players. The Oppo 95, for example, uses a separate Sabre DAC for two channel audio as well as separate internal circuitry. Such as player can and will most probably beat most CD players in the market.
However the parameters that should be compared while comparing a CD player to a DVD player are:
Frequency response:
Signal to noise ratio:
Distortion and Noise (1kHz):
Crosstalk (1kHz):
Dynamic Range (1kHz):
Absolutely, but what I am trying to say is that if you take a CD player and a DVD player with identical specs, you will hear a difference.
4. Different manufacturers does not mean inferior quality.
I never said that. But when you design a player, if you are using parts with pre-determined specifications, your design has to work around those specs. When you do that, compromises will step in.
The technology for CD has not changed in years. So as long as a player can read a Redbook CD well, that is all that is needed. A DVD player has to, on the other hand, contend with swiftly changing specifications - DVD 5, DVD 9, new audio codecs, new video codecs, 5.1, 7.1, and so on. And given the price of the players, it makes sense for a manufacturer to sell a new version with more features every year or so.
If a DVD player has a better DAC than CD player than will a CD sound better in a DVD player? i dont think so, because the Analog recording was first sampled at 16 bits,441.1 Khz for CD and then burnt on the CD. A DVD player with a better DAC however good, will not be able to produce data that already has been lost while sampling! 16 bit, 44.1 KHz recording on a 24 bit, 192 Khz DAC will be 16 bit 44.1 KHz only. so it does not matter.
I don't understand what you saying here. But even then given the same CD (with whatever losses are built in), which will sound better? That is the questions.