Abstract: A hybrid wind musical instrument is a combination of an alto saxophone and an electronic system, and a player has an option between acoustic tones and electronic tones to be produced during performance; the electronic system includes sensors monitoring selected component parts of the key mechanism so as to determine the electronic tones intended to be produced by the player, and plural combinations of pieces of magnet and Hall-effect elements serve as the sensors: However, the component parts of key mechanism are arranged in a narrow space over the surface of tubular instrument body; driven parts are attached to the selected component parts so as to bridge gap between the selected component parts and the Hall-effect elements remote from the selected component parts.

Abstract: When gradation data of a present frame is corrected in combination with gradation data of a preceding frame for each display pixel, the level of correction is controlled according to a predetermined dispersion pattern corresponding to a matrix of pixels on a plasma display panel. The display pixels where the gradation level varies in the same way are not corrected uniformly, but some are excessively corrected and some are uncorrected such that they are mixed in a two-dimensional pattern. Moving images displayed on the plasma display panel with gradations expressed according to the subfield process for pixels are prevented from suffering false moving image contours.

Abstract: A first MOS transistor and a second MOS transistor are interconnected in series. Basically, a set of these MOS transistors are alternately turned on according to a switching signal. The collector of a third transistor is connected to the gate of the second MOS transistor. A capacitor is provided between the base of the third transistor and the connection point between the first MOS transistor and the second MOS transistor.