Structurally linear phase factorization of 2-channel filter banks based on lifting

Lifting is advantageous for its structurally perfect reconstruction property of a filter bank. Based on such lifting structure, this paper is focused on factorization of 2-channel linear phase perfect reconstruction filter bank. We propose factorizations that are also structurally linear phase for this kind of filter bank. For different types of filter banks, we use different approaches to achieve it. We apply the factorization to existing filter banks, and illustrate its advantage towards efficient implementation and reduced precision implementation.