Inappropriate temporal speed of quantization noise is known to be the reason for the so-called pre-echo artifacts in perceptual audio coding. These artifacts occur when a transient signal is being coded in a spectral representation because the quantization noise is spread out over the entire window length of the filterbank and, in this way, is not masked by the signal. A novel approach to the pre-echo problem is presented, allowing to shape the quantization noise in time. The technique is shown to also work efficiently in the case of pitched signals (e.g., speech) where traditional block switching schemes do not offer a solution.
(See document for exact affiliation information.)
https://aes2.org/publications/elibrary-page/?id=7395
(1165KB)
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member Join the AES. If you need to check your member status, login to the Member Portal.
