Difference between CD and Audio CD – R


Before writing this article, I possessed in my hands 2 CDs, one is an audio CD and the other a CD-R, not knowing the substantial difference to both of us computerupdate.org we performed a search.

Backup copies on DVDThe term ” CD-Audio “means a method of writing data , while the term ” CD-R ” indicates a type of support .

We set ourselves the question immediately:

“What are the differences found between the CD-Audio industrially produced and those produced in house by using a burner as CD-R media?”.

In this case, the answer is as follows. First, there is a difference in physical type. The CD-Audio industrial type are printed using a glass matrix that gives at once on an aluminum disc the entire spiral of holes in which the data is encoded, the disk is then laminated to become the CD that we know . in a CD-R  holes are etched one after the other, in sequence, by a laser which induces changes of state (and hence reflectivity) in an inner layer of the diskette.

 

This difference is also due to physical differences in the content and quality of listening?

In principle, no, when you make a copy of a CD-Audio, the data contained on the CD-R copies are exactly those found on the original, and we know that the beauty of digital data just the fact that they remain completely unchanged, irrespective of the medium used and the number of copies made. In reality, however, things are not so simple. During the burning, the inevitable micro-variations in the speed of rotation of the CD can cause irregularities in the positioning of the holes (jitter). Furthermore, the ability to reflect light of the holes in the two types of support is different. These two factors mean that in the course of reading CD-Audio burn to CD-R media to occur a number of reading errors higher than the original.

The CD players have error correction circuits for reading, but excessive working of these circuits will cause the music is reproduced with absolute fidelity. It is possible, therefore, that the perceived sound quality on a CD-R is less than the original (even if we are talking about subtleties by audiophiles, not immediately obvious defects of the ear of the layman). To minimize these differences, it will be appropriate to make the recording at a low speed. There are also some writers (for example, certain Yamaha models, unfortunately now discontinued) specialize in the duplication of CD-Audio : they work by creating “holes” of larger size, which are thus easier to read (the tradeoff is a slight reduction in maximum duration of the CD). Another good rule is to use good quality media. Be warned, though: there are for sale CD-R “for music,” made ​​to be used in recorders table.

The quality of the media of this type, however, is not necessarily higher than that of CD-R “computer”;

the only difference is a different type of taxation, which involves a higher price.

 

 

They are probably destined to disappear with the arrival of the new taxation which, alas, will hit every type of media.