Patent ID: 8276453
Filing Date: 2012-10-02
Classification: G06F

Abstract:
1. An input device, comprising: at least two ultrasonic transducers driven by a driving signal, for respectively sending a transmitting signal to sense an object, and when the ultrasonic transducers sense the object, each of the ultrasonic transducers generates an echo signal; a driving circuit unit, for generating the driving signal; a receiving circuit unit, for determining whether echo signals respectively returned from the ultrasonic transducers are greater than a threshold value or not; a diplexer, coupled to the ultrasonic transducers, the driving circuit unit and the receiving circuit unit, for receiving and transmitting the driving signal to the ultrasonic transducers, or receiving and transmitting the echo signals respectively returned from the ultrasonic transducers to the receiving circuit unit; and a control unit, coupled to the driving circuit unit, the receiving circuit unit and the diplexer, for controlling the driving circuit unit to generate the driving signal for each of a plurality of first predetermined time, controlling the diplexer to transmit the driving signal or transmit the echo signals respectively returned from the ultrasonic transducers, and obtaining a relative motion information between the object and at least one of the ultrasonic transducers according to all of the echo signals which are greater than the threshold value and determined by the receiving circuit unit for each of a plurality of second predetermined times, so as to correspondingly output an input signal, wherein the relative motion information comprises at least a sheltering information, a motion information, a motion speed information and a distance information; and the input signal corresponding to a combination of the sheltering information, the motion information, the motion speed information and the distance information.