Advanced Features of Layer-3 – or: Why does Layer-3 perform so well?
Q: Well, I read your statement about “CD-like” performance, achieved at a data reduction of 4:1 (or 384 kbps total bitrate) with Layer-1, 6..8:1 (or 256..192 kbps total bitrate) with Layer-2, and 12..14:1 (or 128..112 kbps total bitrate) with Layer-3. Can you explain a little further? A: Well, each audio Layer extends the features of the Layer with the lower number. The simplest form is Layer-1. It has been designed mainly for the DCC (Digital Compact Cassette), where it is used at 384 kbps (called “PASC”). Layer-2 has been designed as a trade-off between complexity and performance. It achieves a good sound quality at bitrates down to 192 kbps. Below, sound quality suffers. Layer-3 has been designed for low bitrates right from the start.
