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US 2019/0197842 A1Published application
Minimizing Unwanted Responses in Haptic Systems
AssigneeUltrahaptics Limited
InventorsBenjamin John Oliver Long, Brian Kappus
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Abstract
Disclosed are methods to manipulate a given parametrized haptic curve in order to yield a smooth phase function for each acoustic transducer which minimizes unwanted parametric audio. Further, the impulse response of a haptic system describes the behavior of the system over time and can be convolved with a given input to simulate a response to that input. To produce a specific response, a deconvolution with the impulse response is necessary to generate an input.
Claims25
A method comprising:
- creating haptic feedback using ultrasound comprising the steps of:
- producing an acoustic field from a transducer array having known relative positions and orientations;
- defining a focus point having a known spatial relationship relative to the transducer array defining a path having a known spatial relationship relative to the transducer array in which the focus point will translate;
- moving the focus point near the path so as to produce little audible sound.
1 more element
The method as in claim, 1 wherein the path is subdivided into multiple focal points.
A method comprising:
- generating a drive amplitude and phase of a resonant system to substantially realize a desired drive amplitudes and phases, wherein the resonant system comprises an impulse response of the resonant system, a history of drive phases and amplitudes, and a desired output;
- reducing the impulse response to Fourier components at the resonant system's resonant frequency to create a reduced-form impulse response;
- using the reduced-form impulse response and the history of drive phases and amplitudes to create a predicted current state of the resonant system;
- using the reduced-form impulse response, the predicted current state of the resonant system, and the desired output to generate a final drive amplitude and a final phase.
1 more element
Dependencies are inferred from the claim text.