The following figure illustrates a typical fixed-point multirate filter design process. The grey boxes illustrate the floating-point filter design process and the arrows on the left indicate to which steps you can return if the filter design fails to meet the requirements in the current step.

Figure 20. Typical Fixed-Point Multirate Filter Design Process

Designing a fixed-point multirate filter involves fewer steps than designing a fixed-point single-rate filter. The following sections describe each step in the fixed-point multirate filter design process and compare the process to the fixed-point single-rate filter design process.