Revision as of 18:27, 5 January 2023 edit Em3rgent0rdr (talk \| contribs) Extended confirmed users 7,995 edits →Description: "Battleship" analogy makes the sentence run on and is unnecessary, so I've removed it. Reword "Description" paragraph to work for both computer and piano keyboards. Shortened 2nd-last paragraph wording. Tag: Visual edit ← Previous edit		Revision as of 02:59, 17 January 2023 edit undo Em3rgent0rdr (talk \| contribs) Extended confirmed users 7,995 edits m →Description: clarify "might" because it is not quite true that it "would" necessarily require 62 wires. (For instance using a series of priority encoders and preventing some combinations of simultaneous key presses). Tag: Visual edit Next edit →
Line 2: ==Description== Without a matrix circuit, a 61-key keyboard for a [[digital piano]] or a computer keyboard ~~would~~might require 62 wires to connect (one for each key, and a ground)—an awkwardly thick bundle of wiring. With a matrix circuit, any of 61 keys can be determined with only 16 wires. This is drawn schematically as a matrix of 8 columns and 8 rows of wires, with a switch at every intersection. The keyboard controller scans the columns. If a key has been pressed, the controller scans the rows, determines the row-column combination at which a key has been pressed, and generates the code corresponding to that key. This process occurs so quickly that the user is unaware of any delay.<ref name="dribin">Dave Dribin. [http://www.dribin.org/dave/keyboard/one_html/ "Keyboard Matrix Help"]. 2000.</ref> [[Image:Inside the Yamaha SY77.jpg\|thumb\|300px\|The inside of a [[Yamaha SY77]] synthesizer shows the various internal components. The switches for each key are connected to the microprocessor chip using a matrix circuit. Even though the SY77 has 61 keys, only two small ribbon cables of wiring comes from the keyboard matrix. ]]

Keyboard matrix circuit: Difference between revisions