Displacement detection device for a portable apparatus
First Claim
1. A displacement detection device, comprising:
- an acceleration sensor generating a first acceleration signal relating to a first axis of detection; and
a displacement detection circuit connected to said acceleration sensor and comprising a first comparator stage for comparing said first acceleration signal with a first acceleration threshold and generating a first displacement detection signal, said displacement detection circuit further comprises first filtering means arranged between said acceleration sensor and said first comparator stage and configured to reduce a DC component of said first acceleration signal.
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Accused Products
Abstract
In a displacement detection device, an acceleration sensor generates at least a first acceleration signal relating to an axis of detection, and a displacement detection circuit is connected to the acceleration sensor has a comparator stage for comparing the acceleration signal with a programmable acceleration threshold and generates a displacement-detection signal. A high-pass filter is arranged between the acceleration sensor and the comparator stage so as to reduce a DC component of the acceleration signal. The cut-off frequency of the high-pass filter is modified according to the type of displacements that are to be detected.
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Citations
31 Claims
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1. A displacement detection device, comprising:
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an acceleration sensor generating a first acceleration signal relating to a first axis of detection; and
a displacement detection circuit connected to said acceleration sensor and comprising a first comparator stage for comparing said first acceleration signal with a first acceleration threshold and generating a first displacement detection signal, said displacement detection circuit further comprises first filtering means arranged between said acceleration sensor and said first comparator stage and configured to reduce a DC component of said first acceleration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 18, 19)
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14. A method for detection of the displacements of a portable apparatus, comprising:
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detecting at least a first acceleration signal correlated with the acceleration of said portable apparatus along a first axis of detection;
comparing said first acceleration signal with a first acceleration threshold;
generating a first displacement-detection signal based on the comparison between said first acceleration signal and said first acceleration threshold; and
attenuating by filtering a DC component of said first acceleration signal before comparing said first acceleration signal with said first acceleration threshold. - View Dependent Claims (15, 16, 17)
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20. A circuit, comprising:
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an input circuit receiving an external acceleration signal and generating therefrom a filtered acceleration signal having a reduced DC component;
a detection circuit receiving the filtered acceleration signal and further receiving a threshold signal and generating in response thereto a detection signal; and
a microprocessor receiving the detection signal and generating in response thereto an actuation signal. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A circuit for processing an acceleration signal, comprising:
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an input circuit configured to receive an external acceleration signal and to generate a filtered acceleration signal;
a first threshold signal circuit configured to store and output a first threshold signal;
a comparator circuit configured to receive the first acceleration signal and the first threshold signal and to output a detection signal; and
an enabling circuit configured to receive the detection signal and an external enabling signal and to generate a logic signal in response thereto. - View Dependent Claims (27, 28, 29, 30, 31)
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Specification