Time Domain Analysis of Two-Channel QMF Bank

This manuscript presents a time domain analysis of two-channel quadrature mirror filter (QMF) bank. Product terms in the system function of the QMF bank have been replaced by the respective convolution sums. The perfect reconstruction condition and an expression for ripple energy of the QMF bank have been obtained in time domain. Symmetry properties of the filters have been exploited which obviously reduces the computational complexity.