Only those who really understand the meaning of digital noise can also understand all advantages of digital noise reduction (DNR) system. In short words, you can regard digital noise as any unwanted disturbance in a signal (which is able to block, mangle or change and intersect with it).
Finally, it will be easy for them to compare the digital noise reduction system with their brain, because both of them filter out unwanted information or unnecessary background noise. The main target in this example is for them to get the most out of the conversation, or in the case of video signals, to get rid of any imperfections in them.