2. The block diagram of a general feedback control system is shown in Fig. 14.1.It contains three external input signals: set point Ysp, disturbance D, and additive measurement noise, N.. where G GvGpGm. . 3. Figure 14.1 Block diagram with a disturbance D and measurement noise N.. 4. Example 14.1Consider the feedback system in Fig. 14.1 and the following transfer functions:.