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CD sound quality knowledge

CD sound quality knowledge

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-03-31
  • Views:6

(Summary description)Usually used to describe the minimum bit rate level required to achieve CD sound quality. To achieve CD sound quality, you must use lossless (or lossless compression) formats

CD sound quality knowledge

(Summary description)Usually used to describe the minimum bit rate level required to achieve CD sound quality. To achieve CD sound quality, you must use lossless (or lossless compression) formats

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-03-31
  • Views:6
Information

Usually used to describe the minimum bit rate level required to achieve CD sound quality. To achieve CD sound quality, you must use lossless (or lossless compression) formats, such as WAV (no compression), WMA-Lossless (high compression), FLAC (low compression), APE (high compression), and so on.

 

 

 

Many people complain that the sound quality of the ripped CD has deteriorated. This situation does exist, but it is also confusing: is CD not digital audio? How can there be "distortion" in the copying of digital files? In fact, the problem with ripping CDs is twofold:

 

 

 

Read and write errors

 

This type of error is the same as an ordinary file copy error. It occurs when the source disk is scratched or the CDR disk is of poor quality. At this time, the data is indeed lost. When you use EAC to compare the data on two disks, you will find that there is a significant difference between the two. Note that it is the difference, not OFFSET (OFFSET itself only indicates the initial offset of the data, and will not cause distortion). The solution to this problem is simple: do not use too bad source disk and CDR disk. If the source disk is slightly scratched, it is recommended to use EAC to grab the audio track, which can be read repeatedly to ensure the accuracy of digital copying. I won't elaborate on this point. You can refer to the introduction to the use of EAC in the short song line. And this is not the main reason for the deterioration of sound quality.

 

 

 

Scratched source disk

 

The first type of error is easy to avoid. I believe that the real headache for everyone lies here: why does it cause poor sound quality when there are no read and write errors during burning? Here, I can guarantee that the data is indeed completely written into the CDR. This can be seen by comparing the EAC: there is no difference in the data on the two disks, at most some OFFSET is generated-and this will not affect Sound quality. So what's the problem? The problem is with CD playback. Due to space limitations, I can only briefly explain the principle: in the CD player, the CD playback is real-time: the CD disk runs at a constant speed, and the data read by the optical head is immediately decoded and converted into an analog signal output. During this process, if the rotation speed of the CD is slightly unstable, there will be a change in sound quality. And if the quality of the disc is poor-shape, material, uneven thickness, etc.-it is easier to affect the speed. What about the quality of the CDR discs we use? I don't need to say more. This is the fundamental reason why the sound quality of CDs we rip on our own is worse than that of genuine CDs. As for the quality of CDR discs, we can only do nothing. Of course, you can also pick a general from the lame and choose some of the better quality from the cheap discs, but it is best not to report too much hope for this. For the second reason mentioned above and the principle of CD playback, Taiwanese netizen LukeLo's "Talking about Digital Music" (contained in DearHoney Digital Audio Studio) made it very clear. I suggest you take a look. Speaking of this, you may understand that the CD player is not a pure digital device compared to a computer: due to its "real-time playback" feature, the stability requirements for the mechanical part are too high, and it is no wonder that there will be so Multi-day CDs and CD turntables ... So, are there no solutions for us? There are always ways to do it: I am afraid you are all using CD drives to play CDs, right? In fact, we can bypass this problem: the quality of the CDR disk mainly affects real-time playback, but has little effect on the storage and transmission of digital files. So, why can't we capture the audio track to the computer and then use the computer to play it in a format like WAV? Indeed, if this is the case, there can be no difference between the original version and the ripping. In fact, the digital playback of Win2000 MediaPlayer is this principle: first create a buffer, read a part of the CD audio track and convert it to play, then read a part of the conversion while playing ... This basically avoids the real-time playback. Instability. At this point, the computer has a natural advantage over the CD player.

 

 

 

So to say that, using digital playback to listen to ripped CDs can not achieve the effect of the original CD? of course not. It should be said that if the digital playback is used on the computer, the original and the ripping effect are the same, but it is definitely lower than the quality of the CD player. The problem is not the disc, but the playback software and sound card. A high-quality CD player is not only about the stability of mechanical operation, but also that its conversion process from digital signal to analog output is quite precise. The computer is much worse: even if we do n’t consider noise, electromagnetic interference and other issues, the sound card in our hands is too cheap compared to the function it wants to achieve. It is almost impossible to achieve sound playback like a high-end CD player at such a low cost. Then there is no way? In fact, there is a way out: that is, like dealing with CDs, handing over the hardware to the software. In fact, many circuits of the sound card can be realized by software, and the emergence of T-Racks 24 (dinosaur) software, it is a strong predictor of its feasibility for the simulation of analog circuits. At the same time, the digital signal is at a very high frequency, and it is not without the possibility of directly simulating the analog signal to drive the power amplifier or the speaker. Once realized, its cost will be much lower than the existing CD player, but the sound quality is beyond. Perhaps, when the sound card dies, we can listen to the real sound.

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