1. The problem statement, all variables and given/known data The digitial signal is transmitted and then converted to an analogue form by the DAC. Using data from Fig. 12.2, draw on the axes of Fig.12.3, the output level of the transmitted analogue signal for time zero to time 1.2 ms. 2. Relevant equations Four bit digital numbers being ised 3. The attempt at a solution The solution of the graph is attached. I don't understand how they knew the graph will be constant between 0-0.2 and then 0.2-0.4. How did they calculate this? Secondly this graph looks like a digital graph more than an analogue graph? I don't understand the conversion at all. Thank you for your help.