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Introduction to DSP - IIR filters: direct form I

Filters can be drawn as diagrams:

Filter block diagram

This particular diagram is called the direct form 1 because the diagram can be drawn directly from the filter equation.

The filter diagram can show what hardware elements will be required when implementing the filter:

DSP operations

The left hand side of the diagram shows the direct path, involving previous inputs: the right hand side shows the feedback path, operating upon previous outputs.

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