Liu Zhiyu, Lin Maoliu
(Department of Electronics and Communication Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: A novel approach to two-channel hybrid filter banks
satisfying near-perfect reconstruction was presented. The power complementary pair was
derived from the perfect reconstruction condition of digital conjugate quadrature filter
banks to retain pairwise power complementary property and the lossless property, which
could decrease the aliasing error of the 0 frequency and the low frequency region. The
parameters of the analog power complementary pair were optimized by genetic algorithm, and
the digital synthesis filters were designed by means of the optimization method based on
inverse fast Fourier transforms to ensure the near-perfect reconstruction. The simulations
show that the aliasing error in the whole frequency region is lower than -104 dB, which
satisfies the requirement of analog digital conversion systems with 16 effective bits, 4
bits higher than conventional methods.
Keywords: analog analysis filter; digital synthesis filter; conjugate quadrature filter
bank; hybrid filter bank Velazquez