Multiple-threshold multidirectional inertial device
First Claim
1. A multidirectional inertial device having a plurality of preferential detection axes, comprising:
- inertial sensor means, which are sensitive to accelerations parallel to said preferential detection axes;
transduction means, coupled to said inertial sensor means and supplying a plurality of acceleration signals, each of which is correlated to an acceleration parallel to a respective one of said preferential detection axes;
first comparison means, connected to said transduction means and supplying a pre-determined logic value when at least one of said acceleration signals is greater than a respective upper threshold; and
second comparison means, connected to said transduction means and to said first comparison means for supplying said pre-determined logic value when each of said acceleration signals is greater than a respective lower threshold, which is smaller than the respective upper threshold.
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Abstract
A multidirectional inertial device having a plurality of preferential detection axes includes: inertial sensors, sensitive to accelerations in a direction parallel to the preferential detection axes; transduction stages, which are coupled to the inertial sensors and supply a plurality of acceleration signals, each of which is correlated to an acceleration parallel to a respective preferential detection axis; a first comparison circuit, which is connected to the transduction stages and supplies a pre-set logic value when at least one of the acceleration signals is greater than a respective upper threshold; and a second comparison circuit, connected to the transduction stages and to the first comparison circuit for supplying the pre-set logic value when each of the acceleration signals is greater than a respective lower threshold, which is smaller than the respective upper threshold.
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Citations
22 Claims
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1. A multidirectional inertial device having a plurality of preferential detection axes, comprising:
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inertial sensor means, which are sensitive to accelerations parallel to said preferential detection axes;
transduction means, coupled to said inertial sensor means and supplying a plurality of acceleration signals, each of which is correlated to an acceleration parallel to a respective one of said preferential detection axes;
first comparison means, connected to said transduction means and supplying a pre-determined logic value when at least one of said acceleration signals is greater than a respective upper threshold; and
second comparison means, connected to said transduction means and to said first comparison means for supplying said pre-determined logic value when each of said acceleration signals is greater than a respective lower threshold, which is smaller than the respective upper threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A portable electronic apparatus, comprising:
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a device for reactivation from stand-by, said device including a multidirectional inertial device that includes;
inertial sensor means, which are sensitive to accelerations parallel to each of a plurality of preferential detection axes;
transduction means, coupled to said inertial sensor means and supplying a plurality of acceleration signals, each of which is correlated to an acceleration parallel to a respective one of said preferential detection axes;
first comparison means, connected to said transduction means and supplying a pre-determined logic value when at least one of said acceleration signals is greater than a respective upper threshold; and
second comparison means, connected to said transduction means and to said first comparison means for supplying said pre-determined logic value when each of said acceleration signals is greater than a respective lower threshold, which is smaller than the respective upper threshold.
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10. A method for detecting the state of motion of a device, comprising:
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generating a plurality of acceleration signals, each of which is correlated to an acceleration parallel to a respective preferential detection axis;
supplying a pre-determined logic value when at least one of said acceleration signals is greater than a respective upper threshold; and
supplying a pre-set logic value when each of said acceleration signals is greater than a respective lower threshold, which is smaller than the respective upper threshold. - View Dependent Claims (11, 12)
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13. A device, comprising:
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an acceleration circuit configured to produce a dynamic acceleration signal corresponding to a level of acceleration in each of a plurality of detection axes;
a comparator circuit for each of the detection axes, configured to compare the respective dynamic acceleration signal with respective higher and lower threshold signals; and
a logic circuit configured to produce a selected logic value at an output if the dynamic acceleration signal of any of the plurality of detection axes exceeds its respective higher threshold, or if the dynamic acceleration signals of any two of the plurality of detection axes exceeds their respective lower thresholds. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method, comprising:
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sensing acceleration of a device in each of a plurality of axes;
comparing respective levels of the acceleration in the axes with a high threshold;
comparing the respective levels of the acceleration in the axes with a low threshold;
producing a selected logic value if the level of the acceleration with respect to any one of the plurality of axes exceeds the high threshold; and
producing the selected logic value if the level of the acceleration with respect to any two of the plurality of axes exceeds the low threshold. - View Dependent Claims (22)
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Specification