Which of the following types of noise can often be reduced by a digital noise reduction?

Digital Noise Reduction (DNR) systems use complex digital signal processing algorithms to separate desired signals (like voice or CW) from various types of background noise. They are highly versatile and adaptive to changing signal conditions. Because DNR constantly analyzes the incoming audio spectrum, it can successfully identify and attenuate a wide variety of interference. This includes broadband white noise, repetitive ignition noise, and power line noise, making it an incredibly effective general-purpose noise reduction tool.