Without a matrix circuit, a 61-key keyboard for a synthesizer, electronic organ, or digital piano would require 62 wires to connect (one for each note, and a ground)-an awkwardly thick bundle of wiring. By scanning these crossings, a keyboard controller can determine which keys are currently pressed. ![]() For example, 16 wires arranged in 8 rows and 8 columns can connect 64 keys-sufficient for a full five octaves of range (61 notes). ![]() ![]() ![]() A keyboard matrix circuit is a design used in most electronic musical keyboards and computer keyboards in which the key switches are connected by a grid of wires, similar to a diode matrix.
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