Chapter 7

Digital Filters Using Frames

 

7.1      Theory

AS discussed in Chapter 6, using frame-based processing greatly increases the efficiency of DSP programs. The CPU performing the signal processing algorithm is only interrupted at the end of a frame rather than at every sample. In this chapter, we will show how frames can be used for time-domain digital filtering similar to the filters we discussed in Chapter 3.

Recall that a time-domain implementation of a digital filter involves an iterative calculation of the filter’s difference equation. The only change in this chapter is that we will be dealing with our samples a frame at a time rather than a sample at a time. For simplicity, we will restrict this discussion to FIR filters, but ...

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