Which type of signal is typically unaffected by noise?

Digital signals are typically unaffected by noise due to their binary nature, which consists of discrete values (typically represented as 0s and 1s). This discrete representation allows digital signals to be more resilient in the presence of noise because even if the noise interferes with the signal, the receiver can still distinguish between the high and low states of the binary signal.

For instance, in a noisy environment, a digital signal may receive some distortion, but as long as the level of distortion does not exceed a certain threshold, the original data can still be accurately retrieved. This is in contrast to analogue signals, which are continuous and can be more easily blended or distorted by noise, making them more susceptible to degradation in quality.

Baseband signals refer to signals that occupy the range of frequencies from zero to the maximum frequency of a signal. While they can convey information effectively, they can still be affected by noise, similar to analogue signals. Carrier signals are used in modulation and can also be influenced by noise when transmitted over a distance. Digital signals are thus favored in many communication systems for their robustness against interference, making them a preferred choice for minimizing the impact of noise.