Abstract: A method of designing a subband digital filter bank having first and second analysis filters with a 2-band linear phase satisfies a perfect reconstruction (PR) condition and has transfer functions H0(z) and H1(z) separated into first and second polyphase components Hi0(z) and Hi1(z). The method includes designing H0(z) which is odd-symmetric or antisymmetric and has a degree of 2m+1, converting the PR condition into a matrix form, obtaining H11(z) according to the matrix obtaining H10(z) using H11(z), obtaining H1(z) from H10(z) and H11(z), and obtaining a general second transfer function H1'(z) using H0(z) and H1(z). The filter characteristic of the second analysis filter is adjusted by adjusting x1, and the symmetry or antisymmetry thereof is determined by K.