Systems and methods for distinguishing contact-induced plate vibrations from acoustic noise-induced plate vibrations
First Claim
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1. A method comprising:
- detecting vibrations propagating in a panel;
developing a signal representative of the vibrations;
generating an energy spectrum for the developed signal; and
analyzing the energy spectrum for the presence of one or more features characteristic of ambient noise.
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Abstract
The present invention is directed to systems and methods of distinguishing acoustic noise from valid plate contacts in vibration sensitive devices such as vibration sensing touch panels. The energy content of the detected vibration spectrum can be analyzed for features characteristic of noise, for example a higher relative contribution from high frequencies due in part to preferential coupling of above coincidence frequencies over below coincidence frequencies.
102 Citations
20 Claims
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1. A method comprising:
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detecting vibrations propagating in a panel;
developing a signal representative of the vibrations;
generating an energy spectrum for the developed signal; and
analyzing the energy spectrum for the presence of one or more features characteristic of ambient noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for use with a vibration sensitive touch panel comprising:
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characterizing a first feature set for energy spectra associated with panel vibrations caused by valid panel contacts;
characterizing a second feature set different than the first for energy spectra associated with vibrations caused by noise; and
comparing signals obtained from measured panel vibrations to the first feature set and the second feature set to determine whether the measured panel vibrations are indicative of a valid panel contact or a noise event. - View Dependent Claims (15, 16)
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17. A vibration sensing touch panel system comprising:
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vibration sensors coupled to a touch plate, the vibration sensors configured to generate signals in response to vibrations propagating in the touch plate; and
electronics in communication with the vibration sensors and configured to analyze an energy spectrum of the signals generated by the vibration sensors to determine the presence or absence of spectral features indicative of acoustic noise. - View Dependent Claims (18, 19, 20)
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Specification