Mp3 CD
Mp3 CD
You can record a CD of mp3s that sound good?
The main problem is lasdiferencias between mp3s:
-Differences in volume
-Differences in sound
This is only looking urgentemenete corije some software that will still sort these mp3s to make them sound good next to each other.
It needs to be some modern software that can really work with this so complicated.
For now all we want to hear Mp3s discs, but we want to sound smooth, level, and the like, that sounds good.
An MP3 file is a compressed audio file, ie a file that takes up less disk space due to a compression algorithm. It can be read by programs that execute decompression algorithms.
Sam Lin, a sound engineer, conducted in 2006 a series of quality tests (quality test) to determine if an MP3 can really sound as good as a CD. In the D-blog dedicated to audio MP3 format we saw that this reaches the “transparency” to 192 kbps. Well, Sam used this threshold as a reference, and that below the 192 kbps MP3 sound of it sounds too degraded. First ripped two musical pieces well mixed, with the Concerto No. 3 Rachmaninoff, on the large dynamic range, and the song “Sweet Thing” by Mary J. Blige, for his percussion with dishes, allowed to test frequency response and distortion.
For the process of encoding software used EAC (Exact Audio Copy), extracted the tracks in three different bitrates (192, 256 and 320 kbps) and copied to a CD-R. Sam knew that the way each software encrypts the information affects the final quality of the file and, of course, sounds different.
Finally, using the Cool Edit program performed several analyzes of frequencies using pink noise (pink noise). The results obtained by analyzing the pop of “Sweet Thing” seemed more interesting, he found that in all MP3 bitrates showed gaps caused by the frequencies rejected by the “psychoacoustic model” in the encoding process.
He then proceeded to subjective listening tests on your hi-fi equipment, and found that 192 kbps is perceived a marked difference in quality on the CD. But could not find differences at 256 and 320 kbps. In fact, among a subject ripped at 256 kbps to 320 kbps and another there are no audible differences.
As we know, the upper limit of our ability to perceive high frequency is 20 kHz. However, in the case of sound sources that emit frequencies above 20 kHz, the existence of such ultrasonic frequencies and their interaction with intermodulation frequencies which are within the audible range have an impact on the final sound is perceived, as well engineer Andrés Mayo says in his article “Is there life after 20 kHz”. All this justifies the choice of CD quality sound source compared to MP3, as the differences, though subtle, can perceive.
Turning to the evidence of Sam Lin, 192 kbps MP3 is perfect for listening on the computer or car stereo, two systems with a significant distortion and poor frequency response. For home, however, recommended the CD or MP3 encoded at 256 kbps or 320, since the difference in audio quality between the original CD and MP3 at 256 kbps is not significant.
