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US 2011/0087454 A1Published application
Tap Detection
AssigneeAnalog Devices, Inc.
InventorsJames M. Lee, Jon Austen Williams
Life of this patent
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AssigneeAnalog Devices, Inc.
InventorsJames M. Lee, Jon Austen Williams
Estimating the term…
Methodology and circuitry for determining if a device, such as a cellular phone or personal digital assistant has been tapped is disclosed. The device includes an accelerometer and in response to an acceleration, the accelerometer outputs an acceleration signal. The accelerometer may continuously output an acceleration signal even if no acceleration occurs. A tap detection device receives the temporally sampled acceleration signal and takes the first derivative of the temporally sampled acceleration signal producing one or more derivative values. The tap detection system compares each derivative value to a threshold value and if the derivative value exceeds the threshold a tap is detected. By taking the derivative of the acceleration signal, the noise floor for the acceleration signal is reduced leading to more accurate results with less false positives and less positive negatives.
A computer implemented method for determining taps on a surface of a device having an accelerometer, the method comprising:
A system for determining if a device has been tapped, the system comprising:
A system for determining if a device has been tapped, the system comprising:
A computer program product including a tangible computer readable medium having computer executable code thereon for determining if a tap has occurred on a surface of a device that includes an accelerometer the computer code comprising:
Dependencies are inferred from the claim text.