Displacement detection device for a portable apparatus
First Claim
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1. A portable device controlled by user-imparted motion, comprising:
- a handheld portable device;
a detection device comprising;
an acceleration sensor generating a first acceleration signal relating to a first axis of detection in response to user-imparted motion of the handheld portable device, anda 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 indicative of a displacement of the device along the first axis of detection of the acceleration sensor relative to a reference position, 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 that is due to an acceleration of gravity and reset the reference position of the device, the displacement detection circuit further comprising a hysteresis memory element having a first input and a second input;
said first comparator stage having an output connected to said first input, and a second comparator stage having an output connected to said second input and adapted to compare said first acceleration signal with a second acceleration threshold lower than said first acceleration threshold; and
a microprocessor coupled to the displacement detection circuit to generate control signals to the handheld portable device.
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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
24 Claims
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1. A portable device controlled by user-imparted motion, comprising:
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a handheld portable device; a detection device comprising; an acceleration sensor generating a first acceleration signal relating to a first axis of detection in response to user-imparted motion of the handheld portable device, 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 indicative of a displacement of the device along the first axis of detection of the acceleration sensor relative to a reference position, 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 that is due to an acceleration of gravity and reset the reference position of the device, the displacement detection circuit further comprising a hysteresis memory element having a first input and a second input;
said first comparator stage having an output connected to said first input, and a second comparator stage having an output connected to said second input and adapted to compare said first acceleration signal with a second acceleration threshold lower than said first acceleration threshold; anda microprocessor coupled to the displacement detection circuit to generate control signals to the handheld portable device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detection of user-imparted displacements of a portable apparatus and controlling the portable apparatus in response thereto, comprising:
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detecting at least a first acceleration signal correlated with the acceleration of said portable apparatus imparted by the user along a first axis of detection; comparing said first acceleration signal with a first acceleration threshold and comparing the first acceleration signal with a second acceleration threshold lower than the first acceleration threshold to perform displacement detection with hysteresis; attenuating by filtering a DC component of said first acceleration signal due to the acceleration of gravity before comparing said first acceleration signal with said first and second acceleration thresholds and resetting of the reference position; generating a first displacement-detection signal based on the comparison between said first acceleration signal and said first acceleration threshold and the comparison between the first acceleration signal and a second acceleration threshold that is less than the first acceleration threshold, the first displacement-detection signal indicative of displacement of the apparatus relative to a reference position; and controlling operation of the portable apparatus in response to the displacement-detection signal by generating control signals to a user interface. - View Dependent Claims (9, 10, 11)
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12. A portable apparatus, comprising:
a displacement detection circuit, said portable apparatus chosen from the group consisting of a laptop computer, a PDA, an audio player, a cellphone, and a video camera, the displacement detection circuit comprising; an acceleration sensor generating a first acceleration signal relating to a first axis of detection; 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 a second comparator stage for comparing the first acceleration signal with a second acceleration threshold that is lower than the first acceleration threshold and generating a first displacement detection signal indicative of a displacement of the device relative to a reference position, 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 that is due to an acceleration of gravity and reset the reference position of the device, the displacement detection circuit further comprising a hysteresis memory element having a first input and a second input;
said first comparator stage having an output connected to said first input, and said second comparator stage having an output connected to said second input; andthe acceleration sensor generating second and third acceleration signals relating to second and third axes of acceleration, and the displacement detection circuit generating second and third displacement detection signals and configured to reduce the DC component of the second and third acceleration signals to remove acceleration of gravity therefrom; the portable apparatus further comprising a microprocessor connected to an output of said displacement detection circuit for determining the direction of displacement of said portable apparatus and further coupled to a user interface, the microprocessor adapted to generate control signals to the user interface based on the direction of displacement of the portable device. - View Dependent Claims (13, 14)
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15. A device, comprising:
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a portable device having an electronic control circuit; an input circuit receiving an output from an acceleration circuit that is generated in response to user-imparted motion of the portable device and generating therefrom filtered acceleration signals having a reduced DC component to filter out the acceleration of gravity and constantly resetting a reference position of the portable device; a detection circuit receiving the filtered acceleration signals and further receiving a first threshold comparison signal and a second threshold comparison signal to perform a displacement detection with hysteresis and generating in response thereto detection signals indicating displacement of the portable device relative to the reference position of the portable device; and a microprocessor receiving the detection signals and generating in response thereto actuation signals that are received by the electronic control circuit to control operation of the portable device. - View Dependent Claims (16, 17, 18)
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19. A circuit, comprising:
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a portable circuit having a control circuit; and a detection circuit adapted to detect user-imparted motion to the portable circuit, comprising; an input circuit configured to receive an acceleration signal from an acceleration circuit and to generate a filtered acceleration signal; a first threshold signal circuit configured to store and output a first threshold signal that filters out a DC component that is due to the acceleration of gravity and reset a reference position of the portable circuit and a second threshold signal circuit configured to store and output a second threshold signal; a first comparator circuit configured to receive the first acceleration signal and the first threshold signal and to output a detection signal indicative of displacement of the portable circuit relative to the reference position and a second comparator circuit configured to receive the first acceleration signal and the second threshold signal and to output a further detection signal; a hysteresis memory element, the displacement detection circuit further comprising a hysteresis memory element having a first input and a second input;
said first comparator stage having an output connected to said first input, and said second comparator stage having an output connected to said second input; andan enabling circuit configured to receive the detection signal and an external enabling signal and to generate a logic signal in response thereto that is received by the control circuit, which in turn is coupled to a user interface that receives control signals from the control circuit to control operation of the portable circuit in response to the user-imparted motion of the portable circuit. - View Dependent Claims (20, 21, 22)
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23. A circuit, comprising:
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a portable circuit having a control circuit; and a detection circuit adapted to detect user-imparted motion to the portable circuit, comprising; an input circuit configured to receive an acceleration signal from an acceleration circuit and to generate a filtered acceleration signal; a first threshold signal circuit configured to store and output a first threshold signal that filters out a DC component that is due to the acceleration of gravity and reset a reference position of the portable circuit and a second threshold signal circuit configured to store and output a second threshold signal; a first comparator circuit configured to receive the first acceleration signal and the first threshold signal and to output a detection signal indicative of displacement of the portable circuit relative to the reference position and a second comparator circuit configured to receive the first acceleration signal and the second threshold signal and to output a further detection signal; an enabling circuit configured to receive the detection signal and an external enabling signal and to generate a logic signal in response thereto that is received by the control circuit, which in turn is coupled to a user interface that receives control signals from the control circuit to control operation of the portable circuit in response to the user-imparted motion of the portable circuit; and a set-reset register configured to receive the detection signal and the further detection signal and to output a displacement detection signal to the enabling circuit. - View Dependent Claims (24)
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Specification