CN112328129A - Electromagnetic input device and electromagnetic input method for recognizing interference - Google Patents
Electromagnetic input device and electromagnetic input method for recognizing interference Download PDFInfo
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- CN112328129A CN112328129A CN202011220819.0A CN202011220819A CN112328129A CN 112328129 A CN112328129 A CN 112328129A CN 202011220819 A CN202011220819 A CN 202011220819A CN 112328129 A CN112328129 A CN 112328129A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000003321 amplification Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04162—Control or interface arrangements specially adapted for digitisers for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Position Input By Displaying (AREA)
- Noise Elimination (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides an electromagnetic input device and an electromagnetic input method for identifying interference, wherein the electromagnetic input device comprises an antenna board, a central processing unit connected with the antenna board and a transmitting circuit connected with the central processing unit, the transmitting circuit comprises a first transmitting circuit and a second transmitting circuit, the first transmitting circuit is a high-resistance output circuit, and the second transmitting circuit is a high-level output circuit. The electromagnetic input method comprises the steps of providing an electromagnetic input device, detecting interference signals, judging the interference signals before global scanning, judging the interference signals in local scanning and processing the interference signals. The electromagnetic input device and the electromagnetic input method for identifying interference provided by the invention can solve the problem that electromagnetic interference is applied to electromagnetic handwriting while the report rate of the electromagnetic handwriting is not influenced, and improve the smoothness and accuracy of the electromagnetic handwriting.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of electromagnetic induction, in particular to an electromagnetic input device and an electromagnetic input method for recognizing interference.
[ background of the invention ]
In the existing electromagnetic pressure sensing technology, a layer of circuit board (such as a keyboard and the like) is arranged below a handwriting board in some application places, a magnetic field can be generated in a certain range in an antenna of the handwriting board after the circuit is electrified, and a magnetic field can also be generated in a handwriting pen. The handwriting board after the patent technology solves the problem of the wrong position coordinates, is very smooth to write, and can sense the pressure applied by a user to the pen point, thereby truly reflecting the handwriting of the input stroke.
For electromagnetic handwriting, the handwriting pad has a long life because writing can be performed without applying pressure to the handwriting pad. However, because the electromagnetic board has a certain requirement on power supply stability, the electromagnetic board is unstable or even incapable of working under the condition that the power supply does not meet the requirement, and the handwriting board is connected with the PS/2 port and the COM port at the same time. Therefore, the electromagnetic plate cannot be used on some machines, meanwhile, the electromagnetic plate is relatively large in power consumption and easy to be interfered by electromagnetic interference of external environment, and for example, when a mobile phone is beside or a handwriting pen approaches a loudspeaker of a sound box, the electromagnetic plate can hardly work.
When the existing electromagnetic handwriting equipment is placed in a scene with large interference, such as a keyboard, a handwriting cursor or a function can be disturbed, so that the handwriting performance of the handwriting equipment is interfered, and the handwriting smoothness and accuracy of the electromagnetic handwriting equipment are not facilitated.
Therefore, it is necessary to provide an electromagnetic handwriting method and an electromagnetic handwriting apparatus for recognizing interference to solve the above problems.
[ summary of the invention ]
In the prior art, when placed in a scene with large interference, electromagnetic handwriting equipment is easy to cause a handwriting cursor or function to be disturbed, the handwriting performance of the handwriting equipment is interfered, and the handwriting smoothness and accuracy of the electromagnetic handwriting equipment are influenced.
The electromagnetic input device comprises an antenna board, a central processing unit connected with the antenna board, and a transmitting circuit connected with the central processing unit, wherein the transmitting circuit comprises a first transmitting circuit and a second transmitting circuit, the first transmitting circuit is a high-resistance output circuit, and the second transmitting circuit is a high-level output circuit.
Preferably, the electromagnetic input device further comprises an antenna selection unit, a conversion unit and an amplification unit which are arranged between the antenna board and the central processing unit.
The invention also provides an electromagnetic input method for identifying interference, which is characterized by comprising the following steps:
step S01, providing the aforementioned electromagnetic input device;
step S02, detecting an interference signal: the antenna board does not transmit signals, the MCU of the first transmitting circuit sets high-impedance output, the MCU of the second transmitting circuit sets high-level output, after the first transmitting circuit or the second transmitting circuit is set, the judgment of interference signals before global scanning is carried out, and the step S03 or the step S04 is selected to be entered;
step S03, determining an interference signal before global scanning: the antenna board does not transmit signals, whether the electromagnetic pen exists or not is detected in global scanning, if the position of the pen and the pressure sensing signal exist, the electromagnetic pen is proved to be an interference signal, and the MCU of the transmitting circuit does not upload coordinate data or an interference mark to the upper computer;
step S04, determining an interference signal in local scanning: the antenna board transmits signals, a preset value A is set according to the report rate and the experience value, and when the uploaded coordinate data is larger than the preset value A, the signals are judged to be interference signals;
step S05, processing the interference signal: and processing the interference signal by adopting an average compensation method or a trend compensation method.
Preferably, in step S04, a preset fixed time period B is further set according to the reporting rate and the empirical value, and the interference determination is performed in the preset fixed time period B.
Preferably, the step S02 is ended and then the steps S03 and S04 are performed in sequence.
Preferably, in step S05, the average compensation method includes: when a discrete single-point interference signal is identified, pre-interference data (X) is taken1、Y1) And data (X) after the interference signal2，Y2) To obtain processed data (X, Y), wherein X ═ X (X, Y)1+X2)/2，Y＝(Y1+Y2)/2。
Preferably, in step S05, the trend compensation method includes: when non-discrete wide pulse interference signal is detected, the interference signal is preceded byMultiple sets of data (X)1、Y1)、(X2，Y2)、(X3，Y3) And calculating to obtain interference coordinates through first-order, second-order, third-order or multi-order functions:
(X，Y)＝F{(X1，Y1)，(X2，Y2)，(X3，Y3),...}。
compared with the prior art, the interference recognition electromagnetic input device and the interference recognition electromagnetic input method provided by the invention have the advantages that the first transmitting circuit and the second transmitting circuit are arranged, meanwhile, the first transmitting circuit is a high-resistance output circuit, the second transmitting circuit is a high-level output circuit, the interference signals are respectively judged before the global scanning or in the local scanning, and the interference signals are processed, so that the problem that electromagnetic interference is applied to electromagnetic handwriting can be solved while the report rate of the electromagnetic handwriting is not influenced, and the smoothness and the accuracy of the electromagnetic handwriting are improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic diagram of an electromagnetic input device for recognizing interference according to the present invention;
FIG. 2 is a flow chart of a first embodiment of a method for identifying interfering electromagnetic inputs provided by the present invention;
FIG. 3 is a flow chart of a second embodiment of an electromagnetic input method for recognizing a disturbance according to the present invention;
FIG. 4 is a flowchart of a third embodiment of an electromagnetic input method for recognizing a disturbance according to the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides an electromagnetic input device 100 for recognizing interference, where the electromagnetic input device 100 includes an antenna board 10, a central processing unit 20 connected to the antenna board 10, a transmitting circuit 30 connected to the central processing unit 20, a converting unit 40 disposed between the antenna board and the central processing unit, an antenna selecting unit 50, and an amplifying unit 60. Specifically, the antenna board 10 is configured to transmit and receive electromagnetic induction signals, the central processing unit 20 is connected to the antenna selection unit 50 and the transmission circuit 30, and is configured to select antennas of the transmission circuit 30 and the antenna board 10, and the signals transmitted by the transmission circuit 30 and the antenna board 10 are processed by the conversion unit 40 and the amplification unit 40, respectively. Specifically, the transmitting circuit 30 includes a first transmitting circuit and a second transmitting circuit, the first transmitting circuit is a high impedance output circuit, and the second transmitting circuit is a high level output circuit.
First embodiment
Referring to fig. 1 and fig. 2, the present invention further provides an electromagnetic input method for recognizing interference, which includes the following steps:
step S101, providing the electromagnetic input device 100;
step S102, detecting interference signals: the antenna board 10 does not transmit signals, the MCU of the first transmitting circuit sets a high-impedance output, the MCU of the second transmitting circuit sets a high-level output, and the first transmitting circuit or the second transmitting circuit judges an interference signal before global scanning;
step S103, judging interference signals before global scanning: the antenna board does not transmit signals, whether the electromagnetic pen exists is detected in global scanning, if the electromagnetic pen exists, the electromagnetic pen is proved to be an interference signal, and the MCU of the transmitting circuit does not upload coordinate data or an interference mark to the upper computer;
step S104, processing interference signals: and processing the interference signal by adopting an average compensation method or a trend compensation method.
In step S104, the average compensation method includes: when a discrete single-point interference signal is identified, pre-interference data (X) is taken1、Y1) And data (X) after the interference signal2，Y2) To obtain processed data (X, Y), wherein X ═ X (X, Y)1+X2)/2，Y＝(Y1+Y2)/2. The trend compensation method includes: when detecting non-discrete wide pulse interference signal, the method can be used for processing multiple groups of data (X) before the interference signal1、Y1)、(X2，Y2)、(X3，Y3) And calculating to obtain interference coordinates through first-order, second-order, third-order or multi-order functions:
(X，Y)＝F{(X1，Y1)，(X2，Y2)，(X3，Y3),...}。
second embodiment:
referring to fig. 1 and fig. 3 in combination, fig. 3 is a flowchart illustrating a second embodiment of an electromagnetic input method for recognizing interference according to the present invention, which includes the following steps:
step S201, providing the electromagnetic input device 100;
step S202, detecting interference signals: the antenna board does not transmit signals, the MCU of the first transmitting circuit sets high-impedance output, the MCU of the second transmitting circuit sets high-level output, the first transmitting circuit or the second transmitting circuit judges interference signals before global scanning, and the step S203 is selected;
step S203, determining an interference signal in local scanning: the antenna board transmits signals, a preset value A is set according to the report rate and the experience value, and when the uploaded coordinate data is larger than the preset value A, the signals are judged to be interference signals;
step S204, processing interference signals: and processing the interference signal by adopting an average compensation method or a trend compensation method. The processing method is the same as that in the first embodiment, and is not described herein again.
The third embodiment:
referring to fig. 1 and 4 in combination, fig. 4 is a flowchart illustrating an electromagnetic input method for recognizing interference according to a third embodiment of the present invention.
Step S301, providing the electromagnetic input device 100;
step S302, detecting interference signals: the antenna board does not transmit signals, the MCU of the first transmitting circuit sets high-impedance output, the MCU of the second transmitting circuit sets high-level output, the first transmitting circuit or the second transmitting circuit judges interference signals before global scanning, and the step S303 or the step S304 is selected to be entered;
step S303, judging interference signals before global scanning: the antenna board does not transmit signals, whether the electromagnetic pen exists is detected in global scanning, if the electromagnetic pen exists, the electromagnetic pen is proved to be an interference signal, and the MCU of the transmitting circuit does not upload coordinate data or an interference mark to the upper computer;
step S304, interference signals are judged in local scanning: the antenna board transmits signals, a preset value A is set according to the report rate and the experience value, and when the uploaded coordinate data is larger than the preset value A, the signals are judged to be interference signals;
step S305, processing the interference signal: and processing the interference signal by adopting an average compensation method or a trend compensation method. The processing method is the same as that in the first embodiment, and is not described herein again.
Compared with the prior art, the interference-identifying electromagnetic input device 100 provided by the invention is provided with the first transmitting circuit and the second transmitting circuit, wherein the first transmitting circuit is a high-resistance output circuit, the second transmitting circuit is a high-level output circuit, the interference signals are respectively judged before global scanning or in local scanning, and the interference signals are processed, so that the problem that electromagnetic interference is applied to electromagnetic handwriting can be solved while the report rate of the electromagnetic handwriting is not influenced, and the smoothness and accuracy of the electromagnetic handwriting are improved.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (7)
1. The electromagnetic input device for identifying interference is characterized by comprising an antenna board, a central processing unit connected with the antenna board and a transmitting circuit connected with the central processing unit, wherein the transmitting circuit comprises a first transmitting circuit and a second transmitting circuit, the first transmitting circuit is a high-resistance output circuit, and the second transmitting circuit is a high-level output circuit.
2. The device of claim 1, further comprising an antenna selection unit, a conversion unit, and an amplification unit disposed between the antenna board and the cpu.
3. An electromagnetic input method for recognizing interference, comprising the steps of:
step S01 of providing the electromagnetic input device of claim 1 or 2;
step S02, detecting an interference signal: the antenna board does not transmit signals, the MCU of the first transmitting circuit sets high-impedance output, the MCU of the second transmitting circuit sets high-level output, after the first transmitting circuit or the second transmitting circuit is set, the judgment of interference signals before global scanning is carried out, and the step S03 or the step S04 is selected to be entered;
step S03, determining an interference signal before global scanning: the antenna board does not transmit signals, whether the electromagnetic pen exists or not is detected in global scanning, if the position of the pen and the pressure sensing signal exist, the electromagnetic pen is proved to be an interference signal, and the MCU of the transmitting circuit does not upload coordinate data or an interference mark to the upper computer;
step S04, determining an interference signal in local scanning: the antenna board transmits signals, a preset value A is set according to the report rate and the experience value, and when the uploaded coordinate data is larger than the preset value A, the signals are judged to be interference signals;
step S05, processing the interference signal: and processing the interference signal by adopting an average compensation method or a trend compensation method.
4. The electromagnetic handwriting method according to claim 3, characterized in that said step S04 further comprises setting a preset fixed time period B according to the report rate and the empirical value, and performing the interference judgment in said preset fixed time period B.
5. The electromagnetic handwriting method for recognizing interference according to claim 3, wherein said step S02 is ended and then step S03 and step S04 are executed in sequence.
6. The electromagnetic handwriting method for recognizing interference according to claim 3, wherein in said step S05, said average compensation method comprises: when a discrete single-point interference signal is identified, pre-interference data (X) is taken1、Y1) And data (X) after the interference signal2，Y2) To obtain processed data (X, Y), wherein X ═ X (X, Y)1+X2)/2，Y＝(Y1+Y2)/2。
7. The electromagnetic handwriting method for recognizing interference according to claim 3, wherein in said step S05, said trend compensation method comprises: when detecting non-discrete wide pulse interference signal, the method can be used for processing multiple groups of data (X) before the interference signal1、Y1)、(X2，Y2)、(X3，Y3) And calculating to obtain interference coordinates through first-order, second-order, third-order or multi-order functions:
(X，Y)＝F{(X1，Y1)，(X2，Y2)，(X3，Y3),...}。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011220819.0A CN112328129B (en) | 2020-11-05 | 2020-11-05 | Electromagnetic input device and electromagnetic input method for identifying interference |
| TW110128171A TWI789855B (en) | 2020-11-05 | 2021-07-30 | Electromagnetic input device and method for identifying interference |
| KR1020210118676A KR102615476B1 (en) | 2020-11-05 | 2021-09-06 | Electromagnetic input method for identifying interference |
| JP2021155425A JP7292341B2 (en) | 2020-11-05 | 2021-09-24 | Electromagnetic input device and method capable of identifying interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011220819.0A CN112328129B (en) | 2020-11-05 | 2020-11-05 | Electromagnetic input device and electromagnetic input method for identifying interference |
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| CN112328129A true CN112328129A (en) | 2021-02-05 |
| CN112328129B CN112328129B (en) | 2023-07-18 |
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| CN202011220819.0A Active CN112328129B (en) | 2020-11-05 | 2020-11-05 | Electromagnetic input device and electromagnetic input method for identifying interference |
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| JP (1) | JP7292341B2 (en) |
| KR (1) | KR102615476B1 (en) |
| CN (1) | CN112328129B (en) |
| TW (1) | TWI789855B (en) |
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| US10719148B2 (en) * | 2018-07-10 | 2020-07-21 | Microsoft Technology Licensing, Llc | Coupling a pen device to a companion device based on pen proximity |
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2020
- 2020-11-05 CN CN202011220819.0A patent/CN112328129B/en active Active
-
2021
- 2021-07-30 TW TW110128171A patent/TWI789855B/en active
- 2021-09-06 KR KR1020210118676A patent/KR102615476B1/en active IP Right Grant
- 2021-09-24 JP JP2021155425A patent/JP7292341B2/en active Active
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|---|---|---|---|---|
| JP2001013183A (en) * | 1999-06-30 | 2001-01-19 | Toshiba Corp | Electromagnetic wave disturbance source surveying method and device thereof |
| JP2002297302A (en) * | 2001-03-29 | 2002-10-11 | Wacom Co Ltd | Position detector |
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| US20100108410A1 (en) * | 2008-11-03 | 2010-05-06 | Chia-Jui Yeh | Electromagnetic Manuscript Input Apparatus And Method Thereof |
| CN101957705A (en) * | 2010-09-30 | 2011-01-26 | 汉王科技股份有限公司 | Electromagnetic handwriting equipment and noise recognizing method thereof |
| CN103793122A (en) * | 2012-10-26 | 2014-05-14 | 汉王科技股份有限公司 | Electromagnetic touch device and electromagnetic touch method |
| US20160349920A1 (en) * | 2014-01-26 | 2016-12-01 | Huawei Device Co., Ltd. | Touchscreen Interference Suppression Method and Apparatus, and Terminal Device |
| KR20190080997A (en) * | 2017-12-28 | 2019-07-09 | 주식회사 더한 | Pen Input Device Supporting Heterogeneous Input Device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202219727A (en) | 2022-05-16 |
| KR20220060993A (en) | 2022-05-12 |
| CN112328129B (en) | 2023-07-18 |
| KR102615476B1 (en) | 2023-12-20 |
| JP7292341B2 (en) | 2023-06-16 |
| JP2022075512A (en) | 2022-05-18 |
| TWI789855B (en) | 2023-01-11 |
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