Description

This article is from the MPEG FAQ, by Frank Gadegast phade@cs.tu-berlin.de with numerous contributions by others.

50 O.K., a Layer-2 codec at low bitrates may sound poor today, but couldn't that be improved in the future? I guess you just told me before that the encoder is not fixed in the standard. (MPEG Audio Layer-3 Applications)

Good thinking! As the sound quality mainly depends on the encoder
implementation, it is true that there is no such thing as a "Layer-N"-
quality. So we definitely only know the performance of the reference
codecs used during the international tests. Who knows what will happen in
the future? What we do know now, is:
Today, in MPEG-1 and MPEG-2, Layer-3 provides the best sound quality
at low bitrates, by far better than Layer-2.
Tomorrow, both Layers may improve. Layer-2 has been designed as a
trade-off between quality and complexity, so the bitstream format allows
only limited innovations. In contrast, even the current reference Layer-3-
codec does not exploit all of the powerful mechanisms inside the Layer-3
bitstream format.

 

Continue to:

• prev: 49 Someone told me that in the ITU-R tests, there was some trouble with Layer-3, specifically on male voice in the German language. Still, Layer-3 got the recommendation for "commentary links". Can you explain that? (MPEG Audio Layer-3 Applications)
• Index
• next: 51 What other topics do I have to keep in mind? Tell me about the complexity of Layer-3. (MPEG Audio Layer-3 Applications)

Share and Enjoy

Tags

pc, MPEG, compression, video, audio, mp3, layers, bitstream, software, books, publications, technology, standard, shareware, free