Improving the near-perfect hybrid filter bank performance in the presence of realization errors

Hybrid filter banks have received increasing attention in the literature, for applications such as high-speed, high-resolution A/D and D/A converter design. In the manufacturing process, however, the, filter coefficients of a hybrid filter bank are plagued with some errors due to technological limitations, particularly those of the analog filters, leading to degradation of the system performance. This work presents a novel method for improving the mean signal-to-noise-ratio of near-perfect reconstruction filter banks, taking into account such realization errors. The method consists in minimizing the total noise energy derived in an accurate way by a theoretical expression