Electronic device for recognizing asynchronous digital pen and recognizing method thereof
First Claim
Patent Images
1. An electronic device comprising a digital pen, the electronic device comprising:
- at least three reception sensors installed in the electronic device at positions that are separated from one another, the at least three reception sensors configured to receive a waveform generated by a waveform generator of the digital pen; and
a processor configured to determine an input coordinate of the digital pen using a difference of velocities and reception times of the waveform received by each of the at least three reception sensors,wherein the processor is configured to determine the input coordinate of the digital pen by calculating a 2-Dimensional (2D) input coordinate of the digital pen using a difference between transfer times of at least two cases of waveforms received by the at least three reception sensors, andwherein the input coordinate of the digital pen is calculated using non-linear simultaneous equations comprising;
1) d1−
d2=[(x−
x1)2+(y−
y1)2]1/2−
[(x−
x2)2+(y−
y2)2]1/2=Δ
t12Vs
2) d1−
d3=[(x−
x1)2+(y−
y1)2]1/2−
[(x−
x3)2+(y−
y3)2]1/2=Δ
t13Vs where d1, d2, d3 are respective distances from three reception sensors to a currently input position of the digital pen, (x1, y1) is a coordinate of a first reception sensor, (x2, y2) is a coordinate of a second reception sensor, and (x3, y3) is a coordinate of a third reception sensor, Vs is a velocity of an ultrasonic wave set in advance and used for a calculation equation in the electronic device, x and y is a 2D input coordinate of the digital pen to detect, Δ
t12 is a difference between waveform transfer times received by the first reception sensor and the reception second sensor, and Δ
t13 is a difference between waveform transfer times received by the first reception sensor and the third reception sensor.
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Abstract
An electronic device for receiving an input by a digital pen having a waveform generation means is provided. The electronic device includes at least three reception sensors and a processor. The at least three reception sensors are installed in the electronic device at positions that are separated from one another, and are configured to receive a waveform generated by the waveform generator of the digital pen. The processor is configured to calculate an input coordinate of the digital pen using a difference of velocities and reception times of the waveform received by the at least three reception sensors.
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Citations
16 Claims
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1. An electronic device comprising a digital pen, the electronic device comprising:
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at least three reception sensors installed in the electronic device at positions that are separated from one another, the at least three reception sensors configured to receive a waveform generated by a waveform generator of the digital pen; and a processor configured to determine an input coordinate of the digital pen using a difference of velocities and reception times of the waveform received by each of the at least three reception sensors, wherein the processor is configured to determine the input coordinate of the digital pen by calculating a 2-Dimensional (2D) input coordinate of the digital pen using a difference between transfer times of at least two cases of waveforms received by the at least three reception sensors, and wherein the input coordinate of the digital pen is calculated using non-linear simultaneous equations comprising;
1) d1−
d2=[(x−
x1)2+(y−
y1)2]1/2−
[(x−
x2)2+(y−
y2)2]1/2=Δ
t12Vs
2) d1−
d3=[(x−
x1)2+(y−
y1)2]1/2−
[(x−
x3)2+(y−
y3)2]1/2=Δ
t13Vswhere d1, d2, d3 are respective distances from three reception sensors to a currently input position of the digital pen, (x1, y1) is a coordinate of a first reception sensor, (x2, y2) is a coordinate of a second reception sensor, and (x3, y3) is a coordinate of a third reception sensor, Vs is a velocity of an ultrasonic wave set in advance and used for a calculation equation in the electronic device, x and y is a 2D input coordinate of the digital pen to detect, Δ
t12 is a difference between waveform transfer times received by the first reception sensor and the reception second sensor, and Δ
t13 is a difference between waveform transfer times received by the first reception sensor and the third reception sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16)
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9. A method for calculating an input coordinate of a digital pen having a waveform generator in an electronic device comprising at least three reception sensors, the method comprising:
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determining a difference of at least two reception times of waveforms received from each of the at least three reception sensors; and determining an input coordinate of the digital pen using the determined difference of at least two reception times and a velocity of the waveform set in advance, wherein the determining of the input coordinate of the digital pen comprises calculating a 2-Dimensional (2D) input coordinate of the digital pen using a difference between at least two cases of waveforms received by the at least three reception sensors, and wherein the input coordinate of the digital pen is calculated using non-linear simultaneous equations comprising;
1) d1−
d2=[(x−
x1)2+(y−
y1)2]1/2−
[(x−
x2)2+(y−
y2)2]1/2=Δ
t12Vs
2) d1−
d3=[(x−
x1)2+(y−
y1)2]1/2−
[(x−
x3)2+(y−
y3)2]1/2=Δ
t13Vswhere d1, d2, d3 are respective distances from three reception sensors to a currently input position of the digital pen, (x1, y1) is a coordinate of a first reception sensor, (x2, y2) is a coordinate of a second reception sensor, and (x3, y3) is a coordinate of a third reception sensor, Vs is a velocity of an ultrasonic wave set in advance and used for a calculation equation in the electronic device, x and y is a 2D input coordinate of the digital pen to detect, Δ
t12 is a difference between waveform transfer times received by the first reception sensor and the reception second sensor, and Δ
t13 is a difference between waveform transfer times received by the first reception sensor and the third reception sensor. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification