Two-Channel Quadrature Mirror Filter Bank: An Overview

Table 2

Comparison of three types of two-channel QMF banks.

Feature	NPR; FIR Based	Perfect-reconstruction system	NPR; IIR based
Phase response	Linear	Linear/nonlinear	Nonlinear
Aliasing	Canceled	Canceled	Canceled
Phase distortion	Eliminated	Eliminated	Minimized
Amplitude distortion	Minimized	Eliminated	Eliminated
Overall group delay	𝑁−1	𝑁−1	Complicated
Relation between analysis filters	𝐻1(𝑧)=𝐻0(−𝑧)	Not explicit.; Implicitly	𝐻1(𝑧)=𝐻0(−𝑧)
Power complementarity	Approximately holds	Does not hold	Approximately holds