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US 2012/0056838 A1Published application
Touch Sensitive Device
AssigneeNew Transducers Limited
InventorsNeil John Harris, Martin Colloms
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AssigneeNew Transducers Limited
InventorsNeil John Harris, Martin Colloms
Estimating the term…
A touch sensitive device comprising a touch surface, a force exciter coupled to the touch surface to excite vibration in the surface in response to a signal sent to the exciter, with the touch surface and exciter together forming a coupled system and a signal generator to generate the signal, with the signal generator generating a carrier wave signal at frequencies within the frequency bandwidth of the coupled system and modulating the carrier wave signal with a complex modulation where the modulated carrier wave signal has a time response comparable to that of a low frequency signal which produces a desired haptic sensation whereby a user touching the touch surface excited by the exciter in response to the modulated carrier wave signal experiences the desired haptic sensation which is perceived at a frequency below the frequency bandwidth of the coupled system.
A method of generating a desired haptic sensation in a coupled system comprising a touch surface and a force exciter or actuator coupled to the touch surface, the method comprising generating a carrier wave signal at frequencies within the frequency bandwidth of the coupled system, modulating the earner wave signal with a complex modulation where the modulated carrier wave signal has a time response comparable to that of a low frequency signal which produces the desired haptic sensation and driving the exciter or actuator with the modulated earner wave signal to excite the touch surface whereby the desired haptic sensation is perceived at a frequency below the frequency bandwidth of the coupled system is simulated to a user touching the touch surface.
A touch sensitive device comprising a touch surface, a force exciter coupled to the touch surface to excite vibration in the surface in response to a signal sent to the exciter, with the touch surface and exciter together forming a coupled system and a signal generator to generate the signal, with the signal generator generating a carrier wave signal at frequencies within the frequency bandwidth of the coupled system and modulating the carrier wave signal with a complex modulation where the modulated carrier wave signal has a time response comparable to that of a low frequency signal which produces a desired haptic sensation whereby a user touching the touch surface excited by the exciter in response to the modulated carrier wave signal experiences the desired haptic sensation which is perceived at a frequency below the frequency bandwidth of the coupled system.
Dependencies are inferred from the claim text.