ELECTROMAGNETIC INDUCTION COORDINATE DETECTING SYSTEM AND METHOD THEREOF
First Claim
1. An electromagnetic induction coordinate detecting system, comprising:
- an electromagnetic sensor board configured to emit a board-trigger signal; and
at least one electromagnetic pointing device comprising;
an oscillation unit, configured to resonate and receive the board-trigger signal to emit a coupled-trigger signal;
a monitoring unit, configured to transfer an internal trigger signal according to the coupled-trigger signal; and
a first control unit, configured to control the oscillation unit to emit an electromagnetic signal for a signal emitting period after a delayed period when receiving the internal trigger signal;
wherein, the oscillation unit is enabled after receiving the internal trigger signal, the electromagnetic sensor board calculates the coordinate and the pressure of the electromagnetic pointing device according to the electromagnetic signal.
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Abstract
An electromagnetic induction coordinate detecting method for detecting the trace of at least one electromagnetic pointing device on an electromagnetic sensor board is disclosed. The method includes the following steps: first, a delayed period for each electromagnetic pointing device is pre-determined. Then, whether a board-trigger signal from the electromagnetic sensor board is received is determined. If yes, the electromagnetic pointing device emits an electromagnetic signal after the delayed period. Finally, the electromagnetic sensor board calculates the coordinate and the pressure of each electromagnetic pointing device according to the received electromagnetic signal.
17 Citations
19 Claims
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1. An electromagnetic induction coordinate detecting system, comprising:
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an electromagnetic sensor board configured to emit a board-trigger signal; and at least one electromagnetic pointing device comprising; an oscillation unit, configured to resonate and receive the board-trigger signal to emit a coupled-trigger signal; a monitoring unit, configured to transfer an internal trigger signal according to the coupled-trigger signal; and a first control unit, configured to control the oscillation unit to emit an electromagnetic signal for a signal emitting period after a delayed period when receiving the internal trigger signal; wherein, the oscillation unit is enabled after receiving the internal trigger signal, the electromagnetic sensor board calculates the coordinate and the pressure of the electromagnetic pointing device according to the electromagnetic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electromagnetic induction, coordinate detecting method for detecting the trace of at least one electromagnetic pointing device on an electromagnetic sensor board, and the method comprising:
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pre-determining a delayed period for each electromagnetic pointing device; determining whether a board-trigger signal from the electromagnetic sensor board is received, or not; if yes, the electromagnetic pointing device emits an electromagnetic signal after the delayed period; if not, keep on detecting whether the board-trigger signal is received; and calculating the coordinate and the pressure of the electromagnetic pointing device according to the received electromagnetic signal. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification