METHOD AND DEVICE FOR RECOGNIZING A DUAL POINT USER INPUT ON A TOUCH BASED USER INPUT DEVICE

摘要

There is disclosed a method for recognizing a dual point user input on a touch based user input device, comprising receiving a first user input to said input device relating to a first position, forming a first position signal relating to said first user input, receiving a second user input to said input device relating to a second position, forming a second position signal relating to said first input and said second input, determining on the basis of said first position signal and said second position signal, if said second user input has its source in a simultaneous dual point user input, generating a third position based on said first position and said second position, and using said first and third positions, as the coordinates of said dual point user input. Further there is provided a touch based input device controller for a touch based user input device, wherein said input device is only capable of outputting a single input position signal that depends on the actual user input, comprising, an input connectable to said touch based user input device to receive successive position signals each representing a position on said touch based user input device, which a user has touched, a memory, connected to said input, tcr store at least one of said position signals, a differentiator to detect time dependent transition properties between two different successive positions, a first evaluation circuit connected to said differentiator to determine, if a position following a preceding position is caused by a single point user input or by a dual point user input, a second evaluation circuit, connected to said input, said memory and said first evaluation circuit, wherein said second evaluation circuit is provided to calculate a dual point user input by reflecting a first input position at a successive second position, and an output, connected to said second evaluation unit, connectable to a processing unit.