Click on a letter or number to jump to listings of terms that correspond. [ 5 | A | B | C | D | E | F | G | H | I | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y ] Term Definition Demo Karaoke Audio devices that allow the connection of a microphone for sing-along activities. Special videos are available with missing vocal tracks, and showing the lyrics as a subtitle. Keystone Distortion/Correction In front projectors, if the projector is tilted up or down relative to its design axis, the image will take on a trapeziodal shape, being narrower at the top or bottom than it should be. The common distortion comes from an upward tilt, making the image larger at the top, like the wedge-shaped keystone at the top of a stone arch - the last one to be placed and the one that holds the arch up. Some display devices allow this to be corrected, but there may be some picture degradation. Kilo- A prefix meaning thousand. For example: one thousand Hertz is 1 kilohertz, abbreviated 1 kHz.