Untethered active pen and a method for communicating with a capacitive sensing device using the untethered active pen
First Claim
1. A method for communicating with a capacitive sensing device using an untethered active pen comprising:
- capacitively receiving a capacitive sensing signal at a capacitive receiving unit of said untethered active pen, said capacitive sensing signal output from said capacitive sensing device;
determining a first frequency and a first phase associated with said capacitive sensing signal; and
transmitting at a second frequency and a second phase an amplified active pen signal at said capacitive sensing device from said untethered active pen, said amplified active pen signal having said second frequency and said second phase corresponding to said first frequency and said first phase, said amplified pen signal being a harmonic of said capacitive sensing signal.
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Abstract
A method for communicating with a capacitive sensing device using an untethered active pen. The method includes capacitively receiving a capacitive sensing signal at a capacitive receiving unit of the untethered active pen. The capacitive sensing signal is output from the capacitive sensing device. In addition, the method includes determining a first frequency and a first phase associated with the capacitive sensing signal. Moreover, the method includes transmitting at a second frequency and a second phase an amplified active pen signal at the capacitive sensing device from the untethered active pen. The amplified active pen signal has a second frequency and a second phase that correspond to the first frequency and the first phase.
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Citations
22 Claims
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1. A method for communicating with a capacitive sensing device using an untethered active pen comprising:
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capacitively receiving a capacitive sensing signal at a capacitive receiving unit of said untethered active pen, said capacitive sensing signal output from said capacitive sensing device; determining a first frequency and a first phase associated with said capacitive sensing signal; and transmitting at a second frequency and a second phase an amplified active pen signal at said capacitive sensing device from said untethered active pen, said amplified active pen signal having said second frequency and said second phase corresponding to said first frequency and said first phase, said amplified pen signal being a harmonic of said capacitive sensing signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An untethered active pen comprising:
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a capacitive receiving unit configured to capacitively receive a capacitive sensing signal from a capacitive sensing device; a signal processing unit configured to determine a first frequency and a first phase associated with said capacitive sensing signal and to generate an active pen signal corresponding to said first frequency and said first phase, said signal processing unit further configured to determine a second frequency and a second phase corresponding to said first frequency and said first phase; an amplifier configured to amplify said active pen signal generated by said signal processing unit to produce an amplified active pen signal; and a transmitter unit configured to transmit said amplified active pen signal at said capacitive sensing device from said untethered active pen, wherein said amplified active pen signal has said second frequency and said second phase corresponding to said first frequency and said first phase, said amplified pen signal being a harmonic of said capacitive sensing signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for communicating with a capacitive sensing device using an untethered active pen comprising:
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transmitting a first signal from a sending device; receiving said first signal from said sending device with a receiving unit of said untethered active pen; determining, from said first signal, a first frequency and a first phase associated with a capacitive sensing signal for a capacitive sensing device; and transmitting at a second frequency and a second phase an amplified active pen signal at said capacitive sensing device from said untethered active pen, said amplified active pen signal having said second frequency and said second phase corresponding to said first frequency and said first phase, said amplified pen signal being a harmonic of said capacitive sensing signal. - View Dependent Claims (21)
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22. An untethered active pen comprising:
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a receiving unit configured to receive a first signal from a sending device; a signal processing unit configured to determine a first frequency and a first phase associated with a capacitive sensing signal for a capacitive sensing device from said first signal and to generate an active pen signal corresponding to said first frequency and said first phase, said signal processing unit further configured to determine a second frequency and a second phase corresponding to said first frequency and said first phase; an amplifier configured to amplify said active pen signal generated by said signal processing unit to produce an amplified active pen signal; and a transmitter unit configured to transmit said amplified active pen signal from said untethered active pen at said capacitive sensing device, wherein said amplified active pen signal has said second frequency and said second phase corresponding to said first frequency and said first phase, said amplified pen signal being a harmonic of said capacitive sensing signal.
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Specification