Abstract: A display device is mounted on a vehicle. The display device comprises a display unit and a control unit A virtual screen is a two-dimensional plane at a predetermined distance away from an origin of a XYZ coordinate system along a Y coordinate axis, and is approximately parallel to an XZ plane defined by an X coordinate axis and a Z coordinate axis. The control unit is configured to calculate coordinates of a second point obtained as a result of projecting a first point in the XYZ coordinate system onto the virtual screen, convert the calculated coordinates of the second point into coordinates according to a display mode of the display unit, and cause the display unit to display an image corresponding to the second point at the converted coordinates.

Abstract: A display device is mounted on a vehicle. The display device comprises a display unit and a control unit A virtual screen is a two-dimensional plane at a predetermined distance away from an origin of a XYZ coordinate system along a Y coordinate axis, and is approximately parallel to an XZ plane defined by an X coordinate axis and a Z coordinate axis. The control unit is configured to calculate coordinates of a second point obtained as a result of projecting a first point in the XYZ coordinate system onto the virtual screen, convert the calculated coordinates of the second point into coordinates according to a display mode of the display unit, and cause the display unit to display an image corresponding to the second point at the converted coordinates.

Abstract: Provided is a buzzer that sounds without noise contamination. Specifically, an inaudible frequency signal generation unit 22 generates an inaudible frequency pulse signal P0; an audio frequency signal generation unit 26 generates, from the signal P0, an audio frequency pulse signal P1: a signal synthesizing unit 28 generates a synthesized frequency pulse signal P2 having the signal P0 in an ON time of the signal P1; a first duty ratio setting unit 30 sets a duty ratio Di of the signal P0 in the signal P2 to gradually increase over a first predetermined period of the signal P2, and thus generates a buzzer driving signal P3; and a buzzer driving unit 40 makes a buzzer 60 sound with a pitch corresponding to a frequency of the signal P3 and volume corresponding to the duty ratio of the signal P3.

Abstract: Provided is a buzzer that sounds without noise contamination. Specifically, an inaudible frequency signal generation unit 22 generates an inaudible frequency pulse signal P0; an audio frequency signal generation unit 26 generates, from the signal P0, an audio frequency pulse signal P1: a signal synthesizing unit 28 generates a synthesized frequency pulse signal P2 having the signal P0 in an ON time of the signal P1; a first duty ratio setting unit 30 sets a duty ratio Di of the signal P0 in the signal P2 to gradually increase over a first predetermined period of the signal P2, and thus generates a buzzer driving signal P3; and a buzzer driving unit 40 makes a buzzer 60 sound with a pitch corresponding to a frequency of the signal P3 and volume corresponding to the duty ratio of the signal P3.