Multirate systems and filter banks
Multirate systems and filter banks
Multirate Digital Signal Processing
Multirate Digital Signal Processing
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Recently the attention has to a large extent been paid to the problem of designing perfect reconstruction (PR) filter banks. However, filter banks are most often used in applications where small errors are inevitable and allowed. Imposing PR on a filter bank is then an unnecessarily severe restriction which may lead to a higher arithmetic complexity than is actually required to meet the specification at hand. Much of the efforts have been done to design near PR filter banks using different techniques. One such techniques is by decomposing the overall transfer function of filter into its poly-phase form, all filtering in the interpolators and decimators can be performed at the lowest of the two sampling rates involved resulting in a low overall complexity. Frequency Response Masking (FRM) Approach developed to design FIR filter structures for interpolation and decimation has drawn much attention in the filter designing field. In this paper, simulated results for FRM approach for the designing of FIR filter is presented in a step-by-step fashion in order to elaborate the process. Finally a graphical comparison is made between FIR filter designed using FRM approach and traditional approach.