Direct Form II

Direct Form II is a method used in digital signal processing to implement filters, which modify or analyze signals like audio or data. It efficiently organizes the filter’s calculations by combining the processes of feedback and feedforward into a compact structure, reducing the required memory. This form processes the input signal step-by-step, using internal states (previous outputs and inputs) to produce the current output. It's favored for its balance of clarity and efficiency, making it common in audio processing, communications, and other areas where real-time signal modification is needed.