A Unified Fast Algorithm for Cosine Modulated Filter Banks in Current Audio Coding Standards
In current audio coding standards such as MPEG-1 Layers 1-3, MPEG-II Layers 1-4, MPEG-IV, and AC-3, various forms of the cosine modulated filter bank (CMFBs) have been adopted for compression. This paper proves that all these MCTs can be derived into two modules: the permutation and the discrete cosine transform. The derived DCTs are either type II, type-III, or type IV. On the three types of the DCT, this paper proposes a fast computing algorithm to uniformly compute all the three types of the DCTs. The new fast algorithm will be demonstrated to have good features in regularity, complexity, and general applicability.
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 and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is temporarily free for AES members.