Class 178/20.04 - Phase detecting

Subclass of Class 178 - Telegraphy
Definition: Subject matter wherein position coordinates are determined
No. of patents: 61
Last issue date: 10/28/2008

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Number	Title	Issue Date
7443920	Frame-based carrier frequency and phase recovery system and method Header information is used to facilitate coarse frequency and frame recovery. The coarse frequency and frame recovery is thereafter utilized to perform adaptive phase and frequency synchronization on a frame-by-frame basis. A digitized signal representative of a wir...	10/28/2008
7411581	Touch pad A touch pad (101) includes transducers (201-204) for receiving acoustic signals resulting from touch events, such as the continuous movement of a fingertip across the surface (105) of the touch pad. The acoustic signals are acquired at di...	08/12/2008
7154393	Object detection sensor An object detection sensor wherein a detection electrode (electrode connected with a detection circuit via a conductor) is not exposed from a surface and an input signal is scarcely reduced when a contact area is small, which is capable of reliably detecting a conta...	12/26/2006
7069357	Touch sensor system A touch sensor system and a method of operating the system is provided to detect the touch of a person. An AC power source is provided with an isolated power supply connected to thereto with a DC voltage source output. The DC voltage source is referenced to ground. ...	06/27/2006
7019672	Position sensor A low cost x-y digitising system is described for use in consumer electronic devices, such as portable digital assistants, mobile telephones, web browsers and the like. The digitizer includes a resonant stylus, an excitation winding for energising the resonant stylu...	03/28/2006
7006078	Apparatus and method for sensing the degree and touch strength of a human body on a sensor An improvement in sensor for detecting contact with a human resistive element is disclosed. This design uses additional components to avoid discharging capacitors through the human resistive element, thereby sparing the user the uncomfortable sensation associated th...	02/28/2006
6999007	Linear position sensor In a linear position encoder, a support is provided upon which a pair of phase quadrature windings are mounted. The windings are arranged to have a sinusoidal magnetic sensitivity characteristic along the length of the support. Mounted on a movable element there is ...	02/14/2006
6980134	Signal processing apparatus and method Processing circuitry is provided for processing signals received from, for example, sense coils forming part of a position encoder used to encode the relative positions of two relatively movable members. The position encoder is such that each of the plurality of sig...	12/27/2005
6946853	Non-contact proximity sensor A controller for a vehicular power accessory includes an elongate sensor electrode (102), a capacitive shield (104) extending significantly beyond the sensor electrode (102). A dielectric (106) is disposed between the capacitive shield (	09/20/2005
6788221	Signal processing apparatus and method Processing circuitry is provided for processing signals received from, for example, sense coils forming part of a position encoder used to encode the relative positions of two relatively moveable members. The position encoder is such that each of the plurality of si...	09/07/2004
6788296	Coordinate data entry device The present invention provides a coordinate data entry device comprising a plurality of receivers disposed in the vicinity of a board surface, and a position indicator to transmit signals, at least one of which employs ultrasonic waves, to the receivers, thereby det...	09/07/2004
6489899	Position detector A position detector is provided for detecting the relative movement of first and second members which are mounted for relative movement along a measuring path. One of the members comprises a magnetic field generator for generating a magnetic field and the...	12/03/2002
6249234	Position detector A position detector is provided for detecting the relative movement of first and second members which are mounted for relative movement along a measuring path. One of the members comprises a magnetic field generator for generating a magnetic field and the...	06/19/2001
5920309	Touch sensing method and apparatus Method and apparatus for sensing the simultaneous proximity of one or more fingers or other appropriate objects to a capacitive touch sensor. A modulator/demodulator pair drive and sense either a single trace or a pair of traces. In a dual trace embodimen...	07/06/1999
5859392	Method and apparatus for reducing noise in an electrostatic digitizing tablet A method for reducing the effect of a noise impulse in a digitizing panel which includes a resistive layer is disclosed. The method includes the steps of generating a signal when an object is in proximity to the digitizing panel, amplifying the signal wit...	01/12/1999
5801340	Proximity sensor An improved capacitive sensor for detecting the presence of objects in a sensing region. The sensor is a multilayer structure with alternating layer of condutive and insulating materials. The sensor structure has three electrodes: a touch plate, a guard l...	09/01/1998
5693913	Coordinate reader and method of detecting coordinates A coordinate reader comprises a coordinate detector body having at least one excitation line, at least one detection line, an exciting circuit connected to the excitation line for supplying an exciting signal, a signal processing circuit connected to the ...	12/02/1997
5691512	Position transducer, and method for eliminating noise therefrom A position transducer, and a noise elimination method for eliminating a noise component included in a received signal of the position transducer irrespective of the frequency band of the noise component. A position transducer calculates coordinates of a p...	11/25/1997
5684277	Coordinate input apparatus A coordinate input apparatus which can attain an accurate coordinate input operation, includes a sensor for detecting an input variation. The vibration is amplified, and an envelope detection circuit generates the envelope of the amplified vibration. A ga...	11/04/1997
5428192	Method and apparatus for finding the location of a pointing instrument on a tablet A method and apparatus for producing a digital number representing the location of a pointing instrument with respect to a plurality of spaced conductors is disclosed. The instrument has a coil unit which produces an alternating magnetic field for inducin...	06/27/1995
5416280	Digitizer tablet using relative phase detection In a digitizer and method for laying out and using the tablet of the digitizer, wherein the tablet provides unambiguous binary code outputs. The digitizer may employe a cordless transducer and signal processing circuitry providing relative phase detection...	05/16/1995
5345044	Cordless digitizer using electromagnetic locating signals In order to determine without ambiguity the grid sections on which the pointer is located in a cordless electromagnetic digitizer having x and y locating grids, a third, "phase" grid has conductors that form elongated, narrow open loops, spaced so that ea...	09/06/1994
5329166	Coordinate reading system for detecting operation states of numerous switches The object of the present invention is to enable detecting operation states of numerous switches in a cordless coordinate reading system. The coordinate reading system body is provided with the switching circuit for selecting the excitation signal, so tha...	07/12/1994
5253187	Coordinate input apparatus A coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate such as a transparent glass plate or the like and the coordinates of the position of the ...	10/12/1993
5247138	Cordless digitizer stylus status encoding and transmission scheme In a cordless digitizing system wherein a cordless stylus having a manually operable button thereon transmits positional pulses to a tablet at a carrier frequency this invention is apparatus for transmitting status information about the button to the tabl...	09/21/1993
5245336	Digitizer with overlapped loop pattern and peak phase recognizer A digitizer comprising a microprocessor, a quartz oscillator, a cursor or stylus, an overlapped loop assembly, a peak phase recognizer, an analog/digit converter and other matching devices including multiplexers, amplifiers, filters and etc., wherein the ...	09/14/1993
5235142	Phase reference system for cordless looping digitizer In a cordless, electro-magnetic digitizing system having a drive circuit outputting a square wave drive signal of known initial polarity to a transducer coil in a cursor to oscillate the transducer coil and cause a magnetic field output therefrom which is...	08/10/1993
5220324	Wireless coordinate reader and switch state detection system for coordinate indicator A wireless coordinate reader composed of: a sense line plate having a plurality of excitation lines and a plurality of sense lines arranged thereon; a coordinate indicator including a resonant circuit having a resonance frequency in proximity to the frequ...	06/15/1993
5218174	Low power cordless magnetic field digitizer with differential grid sensing and synchronous position demodulation A digitizing system includes a tablet and a cordless pointing device including a plurality of data grid conductors in the tablet and a plurality of clock grid conductors in the tablet, all receiving a magnetic field signal transmitted by the pointing devi...	06/08/1993
5160813	Cordless digitizer local conductor phase reference system In an electro-magnetic, cordless digitizer system wherein a transducer emits an AC magnetic field which is detected by a first grid of scanned parallel first wires in a tablet to provide positional data for the transducer in a first axis of a coordinate s...	11/03/1992
5124509	Digitizer with capacitive and inductive coupling A battery powered oscillator in a freely movable pointer drives a coil and a divider. A grid of spaced conductors in a base unit is inductively coupled to the coil. A conductive plate that lies parallel to the conductor grid capacitively couples the signa...	06/23/1992
5045645	Digitizer system with passive pointer A driving grid is driven by an ac signal comprising a carrier frequency modulated by a lower frequency. An untethered, batteryless pointer includes a pick-up coil in a first tuned circuit tuned to the carrier frequency, connected by diodes to a driving co...	09/03/1991
5012049	Position determining apparatus An apparatus for precisely locating the position of a transmitter either along a line, or a surface, or within a three dimensional space. More particularly the apparatus of the invention is adapted for use with a computer and includes a pen sized movable ...	04/30/1991
4990726	Digitized controller for position locator A digitizer tablet uses sequenced wire addressing to derive time-related voltages correlated to the location of the addressed wires. The voltages are digitized, and an algorithm followed to determine by interpolation the exact position of a pointing devic...	02/05/1991
4885433	Position determining apparatus An apparatus for precisely locating the position of a transmitter within either a plane or within a three dimensional space. More particularly the apparatus of the invention is adapted for use with a computer and includes a pen-sized movable transmitter, ...	12/05/1989
4878553	Position detecting apparatus A position detecting apparatus for detecting a position pointed by a pointer on a system such as a digitizer has the following parts: a position detection section having a plurality of loop coils arrayed in a side-by-side fashion in the direction of posit...	11/07/1989
4795858	Device for determining position coordinates of points on a surface A device for determining position coordinates of points on a surface, have a cursor structure, a grid structure, and a signal processor. The cursor structure has a cursor coil and a signal generator to impress a reference phase voltage to the coil. Voltag...	01/03/1989
4786765	Coordinates input system Disclosed is a coordinates input system having a tablet constituting a coordinates input portion, a position designating device such as a stylus pen, and a position detection circuit adapted to drive said tablet and detect a position at which coordinates ...	11/22/1988
4739303	Man-machine link for converting coordinates to phase differences representative of increments in the coordinates A tablet device provides a coordinate count. A link is provided for each of the coordinates, the link including a pulse signal generator for generating first and second pulse signals which have a variable phase difference and which supply an interface for...	04/19/1988
4729108	Apparatus for determining a coordinate of a given point on a tablet A coordinate detection system is disclosed which comprises a pointer which is excited by current of a predetermined frequency. Two conductors are arranged on a tablet for producing voltages which depend on the position of the tablet at which the pointer i...	03/01/1988

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Class 178/20.04 - Phase detecting