WO2000065530A1 - Dispositif d'entree du type stylo pour ordinateur - Google Patents

Dispositif d'entree du type stylo pour ordinateur Download PDF

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Publication number
WO2000065530A1
WO2000065530A1 PCT/IL2000/000234 IL0000234W WO0065530A1 WO 2000065530 A1 WO2000065530 A1 WO 2000065530A1 IL 0000234 W IL0000234 W IL 0000234W WO 0065530 A1 WO0065530 A1 WO 0065530A1
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WO
WIPO (PCT)
Prior art keywords
stylus
location
processor
computer
pen
Prior art date
Application number
PCT/IL2000/000234
Other languages
English (en)
Inventor
Mordechai Ben-Arie
Original Assignee
Ben Arie Mordechai
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ben Arie Mordechai filed Critical Ben Arie Mordechai
Priority to AU39864/00A priority Critical patent/AU3986400A/en
Publication of WO2000065530A1 publication Critical patent/WO2000065530A1/fr

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Classifications

    • 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
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • 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

Definitions

  • the present invention relates to information systems and m particular, the present mvention relates to information input devices for digital computer systems
  • the pencil or pen is the oldest known w ⁇ ting device and one which people are most comfortable using when recordmg information
  • the pencil or pen has been adapted for use for several types of input devices for digital computer systems since it seems like a natural extension to what people are used to using Computer devices such as palm computers are based entirely upon the use of a facsimile of a pen as the sole mput device
  • Even traditional pen manufacturers such as Cross are adapting pens for use in the computer world
  • the problem in adapting a pen or pen facsimile for use as an input device is determining the location of the pen and its vector (direction, velocity, etc ) It is desirable to have a pen-type input dev ice which can serve to replace a computer mouse, and perform additional functions in a cost effective manner
  • U S Patent No 3,838,212 entitled “Graphical Data Device” to Whetstone et al describes a graphical data device employing a stylus moving over an area to be digitized and utilizing a fast rise time sound energy shock wave, generated by a spark at the location of the stylus and propagated through the air for providing coordinate information as to the instantaneous position of the spark Receiver devices are positioned along X and Y coordinates and respond to the leading edge of the air propagated shock wave front to provide an elapsed time indication from the moment of spark generation to the moment of shock wave reception A three dimensional configuration is also described utilizing a three coordinate receiver
  • the Whetstone device uses a stylus that is physically connected to a w ⁇ ting pad Two microphones are placed on the plate Three microphones are used for the three-dimensional positioning
  • the pulses that are transmitted through the air are short sparks and the location is measured directly by converting the propagation time in the atmosphere to Cartesian co-ordmates
  • the transmission is done once a pressure switch senses
  • U. S. Patent No. 4,814,552 entitled “Ultrasound Position Input Device” to Stefic et al. describes an input device, or stylus, for entering hand drawn forms into a computer comprising a writing instrument, a pressure switch for determining whether the instrument is in contact with the writing surface, an acoustic transmitter for triangulating the position of the stylus on the surface, and a wireless transmitter for transmitting data and timing information to the computer.
  • the stylus transmits an infrared signal which the system receives immediately, and an ultra sound pulse which two microphones receive after a delay which is a function of the speed of sound and the distance of the stylus from each microphone. From this information the system can calculate the position of the stylus.
  • Switches for indicating functions are mounted on the stylus. Multiple styli can be used, each transmitting a distinctive identification code so that the system can determine which stylus is the signal source.
  • the Stefic et al. device has several innovations compared to the previously described patents.
  • the stylus contains an infrared transmitter, which eliminates the need for the stylus to be physically connected to the writing pad.
  • the infrared pulse is the reference and the distance is estimated by the time of arrival of the ultrasonic pulse after the infrared pulse.
  • the stylus contains several pushbutton switches which allow the user to change functionality of the device such as changing the pen color, toggling between solid and dashed line, line width, etc.
  • the purpose of the Stefic et al. patent is to allow adding hand written data into the computer.
  • Input Device to Biggs et al., describes a wireless pen as a computer input device which moves over the surface of a tablet.
  • the pen will simultaneously emit magnetic pulses and ultrasonic pulses.
  • the tablet id equipped with a magnetic detection coil and two microphones
  • the magnetic detection coil nearly instantaneously detects the magnetic pulse and serves as a time reference for determining the time it takes to detect the ultrasonic pulses
  • the detection circuitry detects a specific point within the ultrasonic pulse and the time travel of the sonic pulse to the two microphones is used to determine the distance of the pen from the two microphones yielding the position of the pen over the surface of the tablet
  • the pen is not attached to the pad but rather sends magnetic pulses as a reference
  • the pulses are generated upon the touch of a switch (m the tip of the pen) with the w ⁇ tmg pad
  • the Biggs et al patent also desc ⁇ bes a noise ⁇ ding threshold for timing estimation, temperature calibration, position calibration using
  • An electronic pen and CrossPadTM w ⁇ tmg tablet from A T Cross Company allows for drawing figures and w ⁇ tmg text on a tablet, converting the text to electronic form and downloading the converted text and graphics to a computer
  • the electronic pen sends RF signals to the electronic notepad when the pen touches the notepad See www cross com
  • the present invention solves the above deficiencies in the art as well as solving other advantages which will be understood by those skilled m the art upon reading and understanding the following desc ⁇ ption
  • the present invention describes a virtual pen which includes a stylus which transmits coded ultrasonic sound waves, and a receiver circuit usmg a plurality of microphones to receive the coded ultrasound
  • the ultrasound is at a frequency which is too high for human or biological detection
  • the signals received by the plurality of receiving microphones are compared by a processor executing location algo ⁇ thms to determine the position of the stylus based upon the different time of arrival of the signals at the microphones
  • Direct sequence (pseudo random) codes in the ultrasound signals are unique to each virtual pen systems such that mterference between adjacent virtual pen users is eliminated
  • a low duty cycle of the ultrasonic waves also aids m minimizing interference between adjacent users Brief Descriptions of the Drawings
  • FIG. 1 in which like reference numbers represent like components throughout the several views, where the leftmost digits of the reference numbers
  • Figure 1 is a perspective view of the present invention of a virtual pen attached to a computer screen
  • Figure 2 is a block diagram of the elect ⁇ cal components and operational features of the stylus of the present invention
  • Figure 3 is an elect ⁇ cal schematic block diagram of the receiver circuit of the present invention
  • Figure 4 is a perspective view of the present invention implemented as an input device for a portable computer.
  • Figure 5 is a perspective view of the present invention implemented as an input device for a desktop computer. Detailed Description of the Preferred Embodiments
  • the present invention describes a virtual pen for use as a computer input device which allows pointing precisely at any selected point on a computer screen as well as being a low cost replacement for a touch pad or drawing tablet.
  • the virtual pen of the present invention uses ultrasonic technology in conjunction with modern radar and communication technology (direct sequence pseudo random codes). Conjoining these technologies enables the production of a low cost and versatile device, which outperforms the existing competing devices.
  • the technology of the virtual pen of the present invention has many embodiments and applications such as direct input of handwriting into the computer, input through a touch-pad, and automatic measurement of distances on paper maps, diagrams or direct measurement and recording of three dimensional physical objects.
  • the virtual pen of present invention also serves as a low cost computer mouse replacement.
  • the virtual pen of the present invention is designed mainly for laptop or palmtop computers, which cu ⁇ entiy use joysticks or touchpads as input devices, the applications of the present invention are many, as illustrated below
  • the virtual pen of present invention may be implemented as a relatively low cost drawing tablet for computer mput Cu ⁇ ently, computer drawing tablet devices are expensive, especially when they have large active drawing area
  • the use of the virtual pen of the present invention is easy since the stylus is a pen-like device familiar to everyone The user simply pomts the stylus near tne computer screen to position the cursor without actually touching the screen
  • selection options under control by the user include approaching the stylus closer to the screen to select an object or text
  • the present invention optionally mcludes the equivalent of " ⁇ ght" and "left" mouse pushbuttons mounted on the stylus
  • the virtual pen of the present mvention could be used as a replacement for a computer touchpad or as a simple joystick as well as a tool for drawmg graphical shapes in commercial presentation graphics program such as Microsoft ® PowerPoint 8 or Visio ®
  • the virtual pen of present invention is manufactured at a cost which is comparable to a computer mouse
  • the stylus of the virtual pen of present invention does not touch the computer screen This is an important distinction over existing technologies since damage to the screen is minimized, especially with modern CCD computer displays, plasma displays, cold-catho
  • the present mvention 100 uses ultrasomc sound waves to provide the spatial location of the stylus 101 and the speed of the motion of the stylus
  • the ultrasound is at frequencies undetectable by the biological ear
  • the tip of the stylus 101 of the present mvention contams an ultrasonic transducer or speaker that generates special waveforms, described below, which are detected by a plurality of ultrasomc receivers or microphones 102a, 102b, 102c, 102d located around the periphery of the computer screen 103
  • the position of the stylus 101 is determined by measunng the difference in time that it takes the ultrasonic wave to reach the microphones, generally 102 In one embodiment of the present invention, four microphones 102a, 102b, 102c, 102d are used
  • the stylus 101 contains a motion sensor, a touch sensor, a processor, an ultrasonic speaker and batte ⁇ es
  • the touch sensor may be implemented by measuring the impedance between conductive st ⁇ ps 208
  • the sequence is 127 chips long constituting a single bit, and 8 bits are transmitted for each pulse
  • the stylus 101 will begm transmittmg the ultrasonic pulses as a result of two conditions a motion sensor is triggered by movement of the stylus 101 and the user holding the stylus has activated the touch sensor
  • the plurality of microphones pick up the transmitted signals designated r b r 2 , r 3 and r 4
  • the ultrasonic signals arrive at the microphones 102 at a slight difference in time according to the spatial position of the stylus 101 relative to the microphones 102
  • the position is determined by computmg the most probable point and a further dynamic calculation is made in order to account for past position of the stylus
  • the speed of the sound wave is dependent on local air pressure and humidity, therefor, a calibration speaker 104 on the plate calibrates the speed of the ultrasonic wave by transmittmg a calibration pulse every few minutes
  • the direct sequence pseudo random code is used for differentiating va ⁇ ous sty from each other and for eliminating the effect of multipath distortion
  • the direct sequence code is transmitted 8 times, allowing for 7 information bits modulated as deferential binary phase shift keymg (DBPSK) in which a ONE will be determined by the reversal of the sequence compared to the previous bit sequence.
  • DBPSK deferential binary phase shift keymg
  • the 7 bits of information are interpreted as 127 va ⁇ ous messages that are used for indications such as pushbutton depression, low battery, etc
  • the stylus batte ⁇ es are simple button-shaped Lithium batte ⁇ es or rechargeable Lithium batte ⁇ es
  • the low speaker power and the 5% duty cycle consume minimal energy from the stylus 101
  • a stylus cradle is used as a charger station and for selecting and synchronizing the direct sequence code when the stylus is in its cradle Implementation of the Present Invention
  • FIG. 2 is a block diagram of the operational features of the virtual pen of the present invention for one embodiment
  • a microprocessor 206 is used to control the operation of the stylus 101
  • two speakers 207a, 207b of stylus 101 send a sequence of ultrasound pulses indicating its position to the receivmg plate
  • the stylus 101 generates a sequence of pulses approximately every 0 2 seconds or 200 milliseconds
  • the burst lasts approximately 10 milliseconds such that a 5% duty cycle is achieved
  • a variety of duty cycles, burst lengths, burst cycle times and frequency of the earner may be varied without departing from the scope of the present invention
  • Each ultrasonic pulse is coded with a sequence of 8 maximal length sequences 127 bits long over a audio carrier havmg a earner frequency of 200,000 kHz
  • the stylus generates the pulses only when some resistance is sensed between the conducting strips 208a, 208b from a user's hand, and an indication from the motion sensor 209
  • the ultrasomc sequences are coded to be unique to each virtual pen so that adjacent users will not suffer mterference with their respective virtual pens
  • the stylus 101 is mounted in its cradle (not shown)
  • the batte ⁇ es 210 are charged and the microprocessor 206 synchromzes the transmission code sequence and the timing of the pulses.
  • an elect ⁇ cal schematic block diagram of the receiving circuit 300 for the virtual pen system of the present mvention is shown A plurality of microphones 102, which in one embodiment, four are used 102a, 102b, 102c, 102d, d ⁇ ve amplifiers 324a, 324b, 324c, 324d, respectively, with the received ultrasound signals be g converted to digital signals by analog-to-digital converter 323
  • the digitized ultrasound signals are processed by microprocessor 306 to demodulate the signals, filter out signals which are coded for a different stylus (such as received from another virtual pen used located nearby), and decode an> commands transmitted by the stylus 101 (such as a low battery signal)
  • the microprocessor 306 uses location algorithms descnbed below to determine the X-Y (two-dimensional implementation) or X-Y-Z (three-dimensional implementation) Cartesian coordinates of the stylus tip
  • the microprocessor then converts the stylus position into millimeters or whichever location parameters are required by the host computer
  • the microprocessor 306 of the receiver 300 also generates pulses 320 for calibration through a calibration speaker 104
  • the calibration pulses are generated about every 5 mmutes and are also approximately 10 millisecond in length, which is too short for a biological ear to sense such that the users will not notice the sounds
  • Special codes umque to each virtual pen system identifies the calibration pulses
  • the calibration pulses allow the virtual pen system to identify the speed of the ultrasonic wave, which will vary accordmg to air temperature and pressure
  • the calibration process is used for self test and is continuously monitored for changes by microprocessor 306
  • the microprocessor 306 compares the time and phase of the received pulses to the transmitted pulses to monitor changmg conditions Thus, when the microprocessor converts the stylus location coordinates into ranges m millimeters, it also corrects for location temperature and pressure va ⁇ ations to compensate for the varying speed of the ultrasonic wave computed dunng the calibration process
  • the measurement of the stylus location is further enhanced by the microprocessor which mamtams a history of previous measurements m memory 322 and by usmg a Kalman filter to computes the first and second de ⁇ vatives of the motion of the stylus The results of this computation is also used for enhancement of the accuracy of determining the spatial position and avoid erroneous locations
  • the receiver circuit 300 selects the transmittmg sequence and the timing of the stylus 101 when it is located m the cradle 321.
  • the cradle serves to charge the stylus batteries and to synchronize the receiver circuit 300 with the stylus 101.
  • one embodiment of the present mvention utilizes four receiving microphones 102a. 102b, 102c, 102d, although those skilled in the art will readily recognize that a greater or lesser number of microphones are possible without departing from the scope of the present invention.
  • the algorithms descnbed here are based on four receiving microphones but the algorithms can be converted to operate with a greater or lesser number of microphones.
  • Cartesian coordinates is accomplished by applying trigonometric formulas for measurements of four ranges. This conversion utilizes the cosine theorem in a triangle).
  • T 0 define the time in which the pulse left the stylus.
  • the formal solution for a single measurement is as follows
  • the size of the speaker 207 or speakers 207a, 207b and the microphones 102 must be sized correctly in order to achieve less than a millimeter spatial error.
  • the speaker size should be in the order of the wavelength to be effective which is 1.7 mm.
  • the speaker size imposes inherent error but the size does not create relative local e ⁇ ors: improperly sized speakers will create deformation on a large sheet of paper.
  • the ultrasound wave is expected to propagate as an omni-directional wave but it will propagate through the paper at higher speeds (although attenuated) and it will be reflected from the user's hand and other elements in the neighborhood of the virtual pen system.
  • the effect of this sonic propagation error is similar to multipath effect in RF communication.
  • This sonic propagation error is resolved by applying an adaptive filtering process for eliminating the reflections and isolating the main ultrasonic wave. Note that only the first incoming wave is of interest and the maximal length sequence will suppress the reflections.
  • Environmental noise may also contnbute to the enor in accurately determining the stylus tip location
  • High pass filters are used to remove any energy below 100 kHz to suppress environmental noise
  • High frequency ultrasonic waves rapidly decay while propagating m the air so the ultrasound will be contained in a very small area around the virtual pen system
  • Cross interference or crosstalk may also contribute to location enor Using a multitude of virtual pen systems in a small physical area will create cross interference between the systems The cross interference might confuse the microprocessor 306 causmg it to misidentify the stylus corresponding to its virtual pen system The chance of a misidentification is elimmated by usmg vanous sequences (umque direct sequence pseudo random patterns) and trailers having identification information withm the code sequence Also, a time tracking algorithm is used for filtering the pulses in time such that pulse outside the maximum time wmdow for the size of the computer screen are elimmated
  • the one embodiment discussed at length above is the replacement for the computer mouse.
  • An enhanced mouse embodiment would provide functionality beyond that capable of an ordinary mouse or trackball.
  • using a laptop or notepad computer is sometimes awkward to operate due to the fact that the built-in mouse or mouse replacement (such as joysticks or touchpads or pointer buttons) are not easy to use. This is especially true in situations where the mobile user uses the laptop computer in vehicles such as in trains, airplanes, cars, busses, etc.
  • the present invention provides a small and easy-to-use replacement of the mouse as an add-on or as a simple attachment that does not require additional space.
  • a mouse replacement application of the present invention the user simply approaches the location on the screen in which he wishes to place the cursor by using the stylus 101.
  • the cursor will be "pulled” when the stylus is at a distance of less than approximately 2 cm from the screen. Approaching closer to a distance of approximately 1 cm will be the equivalent of a traditional mouse left hand-side pushbutton.
  • left and right pushbuttons are an added option to the stylus.
  • Figure 4 shows an example of using the present invention on a laptop computer 400.
  • FIG. 5 shows an implementation of the present invention for a drawing pad or touchpad 540 replacement.
  • the existing electronic notepads (such as PalmPilot) are somewhat inconvenient to use for taking large amount of notes during lectures since the writing area is too small. Palmtop computers are expensive and their batteries could not maintain a whole day of school.
  • the present invention as a touchpad replacement 540 allows students or others to take notes in hand writing.
  • the drawing tablet 540 of Figure 5 is shown connected to a desktop for downloading the stored handwriting. Tablet or pad 540 can also be connected to a laptop 400.
  • the tablet 540 may be implemented with enough internal memory and processing power to hold a great deal of graphical information and may be carried into the lecture hall as a standalone device.
  • the tablet 540 of Figure 5 may have a paper writing area and the stylus may be implemented with an ink reservoir and tip (as found in a conventional writing apparatus) such that the w ⁇ tmg or graphics is done on paper and simultaneously recorded Using special software such as Palm w ⁇ ting could allow a direct conversion of the handw ⁇ tmg into alphanume ⁇ c standard files stored on the tablet 540 Further, different colors could be used m the stylus either by several multicolor pens 101 or a pen stylus that contams several colors by color selection which would be sensed by the receiver 300 of the present invention Also, the touchpad replacement 540 may utilize a wireless connection to computer 501 via infrared (IR) communication
  • IR infrared
  • a w ⁇ ting pad implementation of the present invention is similar to the touchpad but the resolution would be much better
  • the w ⁇ tmg pad could be an independent device with large memory that will store the hand-wntten mformation and download it later to the computer 501
  • the virtual pen system is implemented as an engineenng tool that will allow readmg distances on maps with changeable scales, as well as allowing 2d (two dimensional) and 3D (three dimensional) measurements of small bodies and physical objects
  • the size of the sensed object is only limited by the placement and sensitivity of the microphones 102 It is conceivable to implement a very large virtual pen system
  • the location algorithms may be implemented in hardware, software, or any combmation of the two Modulation circuits in the stylus 101 may be phase locked loop circuits, or many other vanations ASIC (application-specific integrated circuits) devices may combine a large number of analog and digital circuitry, such as most of the components of Figure 3, into a single package

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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)
  • Acoustics & Sound (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
  • Position Input By Displaying (AREA)

Abstract

L'invention concerne un dispositif d'entrée d'ordinateur à stylo virtuel, qui comporte un stylet (101) émettant des ondes ultrasonores codées, et un récepteur utilisant plusieurs microphones (102a-d) pour recevoir les ultrasons codés. Les ultrasons ont une fréquence trop élevée pour pouvoir être détectés par l'être humain. Les signaux reçus par les microphones récepteurs sont comparés par un processeur exécutant des algorithmes de localisation pour déterminer la position du stylet. Les codes pseudo-aléatoires en séquence directe des signaux ultrasonores sont propres à chaque système de stylo virtuel, de façon à éliminer les interférences entre utilisateurs de stylos virtuels voisins.
PCT/IL2000/000234 1999-04-22 2000-04-19 Dispositif d'entree du type stylo pour ordinateur WO2000065530A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU39864/00A AU3986400A (en) 1999-04-22 2000-04-19 Pen input device for a computer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13084899P 1999-04-22 1999-04-22
US60/130,848 1999-04-22

Publications (1)

Publication Number Publication Date
WO2000065530A1 true WO2000065530A1 (fr) 2000-11-02

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Cited By (13)

* Cited by examiner, † Cited by third party
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WO2005043376A1 (fr) * 2003-10-29 2005-05-12 Intel Corporation (A Corporation Of Delaware) Procedes et appareil relatifs a une interface de pointage a main
DE102004020242A1 (de) * 2004-04-22 2005-11-17 Steinbeis GmbH & Co. für Technologietransfer vertreten durch STZ EURO Steinbeis-Transferzentrum Energie- Umwelt-Reinraumtechnik Verfahren und Vorrichtung zur Leckprüfung einer Filtereinrichtung
CN100353303C (zh) * 2003-06-20 2007-12-05 刘习杰 超声波定位的多功能笔形鼠标系统
WO2008117292A3 (fr) * 2007-03-27 2008-12-31 Epos Technologies Ltd Système et procédé de positionnement
EP2080188A2 (fr) * 2006-10-05 2009-07-22 Pegasus Technologies Ltd. Système de stylo numérique, dispositifs émetteurs, dispositifs récepteurs, et leurs procédés de fabrication et d'utilisation
US7729204B2 (en) 2007-06-08 2010-06-01 Microsoft Corporation Acoustic ranging
CN102053777A (zh) * 2009-11-04 2011-05-11 鸿富锦精密工业（深圳）有限公司 手写输入装置
CN102053779A (zh) * 2009-11-09 2011-05-11 鸿富锦精密工业（深圳）有限公司 手写输入装置
CN102799312A (zh) * 2012-06-27 2012-11-28 创维光电科技(深圳)有限公司 一种触控检测系统
US8386963B2 (en) 2009-05-28 2013-02-26 Microsoft Corporation Virtual inking using gesture recognition
EP2720118A1 (fr) * 2012-10-09 2014-04-16 BlackBerry Limited Appareil et procédé ayant trait au test d'un chemin de communication de stylet pour interférence
US9411440B2 (en) 2014-08-22 2016-08-09 Qualcomm Incorporated Digital ultrasonic emitting base station
CN107272479A (zh) * 2016-04-05 2017-10-20 Lg电子株式会社 基于超声波的触摸感测装置以及包括该装置的烹饪设备和家用电器

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100353303C (zh) * 2003-06-20 2007-12-05 刘习杰 超声波定位的多功能笔形鼠标系统
JP2007529064A (ja) * 2003-10-29 2007-10-18 インテル・コーポレーション ハンドヘルドポインタベースユーザインターフェースを提供する方法及び装置
US8572514B2 (en) 2003-10-29 2013-10-29 Intel Corporation Methods and apparatus to provide a handheld pointer-based user interface
CN100555187C (zh) * 2003-10-29 2009-10-28 英特尔公司 用于提供手持式基于指向器的用户接口的方法和装置
WO2005043376A1 (fr) * 2003-10-29 2005-05-12 Intel Corporation (A Corporation Of Delaware) Procedes et appareil relatifs a une interface de pointage a main
US7735024B2 (en) 2003-10-29 2010-06-08 Intel Corporation Methods and apparatus to provide a handheld pointer-based user interface
DE102004020242A1 (de) * 2004-04-22 2005-11-17 Steinbeis GmbH & Co. für Technologietransfer vertreten durch STZ EURO Steinbeis-Transferzentrum Energie- Umwelt-Reinraumtechnik Verfahren und Vorrichtung zur Leckprüfung einer Filtereinrichtung
EP2080188A4 (fr) * 2006-10-05 2012-05-16 Pegasus Technologies Ltd Système de stylo numérique, dispositifs émetteurs, dispositifs récepteurs, et leurs procédés de fabrication et d'utilisation
EP2080188A2 (fr) * 2006-10-05 2009-07-22 Pegasus Technologies Ltd. Système de stylo numérique, dispositifs émetteurs, dispositifs récepteurs, et leurs procédés de fabrication et d'utilisation
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