Distinguishing vibration signals from interference in vibration sensing touch input devices
First Claim
1. A touch input device comprising:
- a plurality of vibration sensors mechanically coupled to a touch plate and configured to generate vibration signals in response to vibrations propagating in the touch plate due to a touch input, and to communicate the vibration signals to controller electronics through associated signal transmission channels, wherein there is a relative orientation between the vibration sensors and their associated transmission channels so that cross-correlating signals received on the transmission channels distinguishes vibration signals from signals caused by electromagnetic interference.
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Abstract
The present invention discloses systems and methods for use with vibration sensing touch input devices that distinguish signals derived from vibrations on a touch plate due to a touch input from signals derives from electromagnetic interference. In the present invention, the phase response of the signals due to electromagnetic interference can be inverted relative to the phase response of the signals due to vibrations in at least one signal transmission channel so that pair wise cross-correlation of the various signal channels reveals the signals caused by electromagnetic interference. Once electromagnetic interference is identified, it can be ignored or otherwise appropriately taken into account by the system.
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Citations
14 Claims
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1. A touch input device comprising:
- a plurality of vibration sensors mechanically coupled to a touch plate and configured to generate vibration signals in response to vibrations propagating in the touch plate due to a touch input, and to communicate the vibration signals to controller electronics through associated signal transmission channels, wherein there is a relative orientation between the vibration sensors and their associated transmission channels so that cross-correlating signals received on the transmission channels distinguishes vibration signals from signals caused by electromagnetic interference.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining information related to a touch input in a system that includes a plurality of vibration sensors coupled to a touch plate for detecting vibrations in the touch plate due to the touch input and generating corresponding vibration signals that are communicated to controller electronics via signal transmission channels associated with the vibration sensors, the method comprising:
- inverting a phase response to vibration signals relative to signals caused by electromagnetic interference in a portion of the transmission channels; and
cross-correlating signals received on the transmission channels to distinguish vibration signals from electromagnetic interference. - View Dependent Claims (12, 13)
- inverting a phase response to vibration signals relative to signals caused by electromagnetic interference in a portion of the transmission channels; and
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14. A method of making a vibration sensing touch input device comprising:
- coupling a plurality of vibration sensors to a touch plate;
orienting the vibration sensors so that a portion of the vibration sensors are inverted with respect to a feature of the touch plate relative to the other vibration sensors;
electrically connecting the vibration sensors to controller electronics through transmission channels associated with each vibration sensor, the controller electronics configured to cross-correlate signals received on each transmission channel; and
providing for inverting signals communicated to the controller through the transmission channels associated with the inverted vibration sensors.
- coupling a plurality of vibration sensors to a touch plate;
Specification