Two of the most common MEMS microphone arrays are broadside and endfire. Well-suited for a computer monitor or TV screen, broadside microphone arrays are a one- or two-dimensional array of microphones placed perpendicular to the source of the desired sound. The signals from each of the microphones are then summed to produce the desired electrical signal. Sounds perpendicular to the array, either in front or behind, will arrive at the microphones at the same time and sum constructively, while sounds not perpendicular will arrive at differing time delays, resulting in a lower level electronic signal.