Write short note on simple alias free QMF systems.
Answers
Answered by
0
Abstract
This paper presents a design of prototype filters for quadrature mirror filter (QMF) banks. To minimize the value of reconstruction error for near-perfect reconstruction (NPR), linear optimization has been applied. Variable and combinational window functions with high side-lobe-fall-off-rate (SLFOR) have been used to design lowpass prototype filters. Use of window functions resulted in simple implementation. High SLFOR of combinational windows reduced the energy leakage due to aliasing from one sub-band to the other. The proposed optimization algorithm takes a few seconds on Pentium processor.
This paper presents a design of prototype filters for quadrature mirror filter (QMF) banks. To minimize the value of reconstruction error for near-perfect reconstruction (NPR), linear optimization has been applied. Variable and combinational window functions with high side-lobe-fall-off-rate (SLFOR) have been used to design lowpass prototype filters. Use of window functions resulted in simple implementation. High SLFOR of combinational windows reduced the energy leakage due to aliasing from one sub-band to the other. The proposed optimization algorithm takes a few seconds on Pentium processor.
Similar questions