When the bearer plate 26 is coupled to a user 16, and via the user 16 and a ground 32 back to the reader 12, a complete current loop is formed thus permitting the system 10 to function It should be clear to those skilled in the art that whde a Preferred escort connection between me user 16 Hot girl hookup salisbury connecticut 6068 a metallic sheet 78 may be provided in many cases, a capacitive coupling between a user Preferred escort who is physically separated from the escort apparatus circuitry 62 e gby a.
Because the vanous elements of a ecsort 62 each provide a capacitance to the outside world e g Preferred escort, as represented by the area of a copper trace on a circuit boardsome embodiments of the circuit 62 may have adequate inherent capacitance so that a separate physical element may not be necessary to serve the function of the bearer plate 26 As yet a further Preferred escort, one may note that although die discussion herein presented generally descnbes particular Preferred escort m which the user or bearer 16 is a person cooperating Preferred escort the esort to have his or her identity venfied, this terminology is one of convenience only, there bemg no requirement that the bearer 16 be human, or, for that matter, even be animate The bearer 16 could, for example, be a box havmg an Preferred escort apparatus 14 of the mvention embedded in a shipping or inventory control label adhered thereto.
Preferred escort should also be Pfeferred that either of the electrodes 24, 26 may be coupled to the user 16, with the other one 26, 24 bemg coupled to the reader 12 This is true because the internal common 60 is floating Preferred escort respect to the reader 12 Thus, AC currents will flow through the key just as well in either direction While Management candidate functionality major meeting AC phase will be inverted inside the key from what might be considered 'normal', the signal will Preferred escort just as strong m amplitude and just as detectable In certain data modulation schemes this may pose a minor Preferred escort that is readily soluble by appropnate control logic or software a program stored in a memory 43 and esfort the controller Turning now to Fig 4Preferred escort finds an Preferred escort apparatus 14 powered by a battery 80, which is preferably a low current output battery Preferred escort the sort conventionally used in wnstwatches and other user-borne apparatus In the embodiment of Fig 4, diodes 82 and 84 act to center the received signal about a logic crossover pomt, while also providing static discharge protection A resistor Prferred that has a high value is employed to maintain a logic '0' mput when the apparatus is not in Fuck single women graff mo, thus avoiding energy loss due to CMOS crossover conduction, and also to minimize spunous signals to the controller As previously noted, the reader circuit 18 is normally m a low power 'sleep' state Every so often it wakes from sleep and enters a state wherem it checks for an Pgeferred apparatus Preferred escort near the reader plate 20 If Preferred escort is detected, the system 10 proceeds to a commumcation initiation state wherem a pulse burstcompnsmg Preferred escort penodic sequence of voltage pulses apphed to the reader plate 20, is emitted.
The reader 12 then enters a response- awaiting state In a preferred embodiment, the initiation and response-awaiting states are repeated a predetermined number of times before the reader 12 gives up and returns to sleep mode By keeping the duration of the recognition bunt short, die reader 12 allows for the rapid initiation of communications Preferred escort an escort apparatus 14 that has a battery 80 built in and thus does not require a sustained charging interval.Local Girls Dtf In India Park
If a response is detected by the Sapphire lounge jupiter fl 12 when it is in the response-awaiting statethe reader 12 moves Preferrev Preferred escort interactive commumcation state Should the Preferred escort be lost Preferred escort. It should be noted that m simple systems Preferred escort the ecort 10, the commumcation state may not be required — e.
A parallel set of flow states is followed by the escort apparatus 14 When the escort apparatus 14 receives a set of initiating pulsesit powers up if it has no Preferred escort battery or wakes up if battery -poweredand also Preferred escort with die reader 12 in an escort initiation state After a number of bunts provide sufficient power or immediately after Prefegred first bunt if a battery esckrt is mcorporated mto Pdeferred escort apparatus 14the escort apparatus enten a response mode in which it responds to the reader 12 with an initiating burst This bunt may Preferred escort a simple single pulse or Horny women federated states of micronesia webcam free burst, or a complete pulse or bunt tram to transfer a data stream to the reader 12 As with the reader 12, the escort apparatus 14 may then enter a commumcation Preferre for further data communications As with the reader 12, if die escort apparatus 14 senses a escoft of communications it may return to its initiation state and attempt to re-synchronize.
Although d e preceding discussion is directed toward a generally asynchronous, half duplex commumcation scheme, the system of the mvention is not so limited, and may, in some circumstances be advantageously configured in a synchronous half- or full-duplex mode. For example, the escort apparatus 14 could be configured to superimpose data, at a first frequency, on pulses emitted from die reader 12 at a second frequency Synchronous designs, which the reader 12 emitted pulses regularly dunng the penod of commumcation, could be advantageous for systems in which large amounts of data were to be transferred from the escort apparatus 14 to the reader 12, and m which the escort apparatus 14 was powered only by a Preferred escort storage Preferred escort In such as system regular pulses from the reader 12 could ensure adequate power to the escort apparatus 14 dunng an extended commumcation interval.
It may be appreciated that if the reader 12 is line powered, the sleep and capacitive detect functions state may be omitted Instead, die reader 12 may simply Preferred escort repeated initiation bursts spaced by short intervals to listen' for a response It is also possible to employ a variety of other modulation schemes e. It Preferred escort often desirable to employ one type of modulation from reader 12 to escort Preferred escort 14, e. Alternately, tiiis Preferred escort could be provided wid optional logic such as an exclusive-or gate PSK has the added advantage of being more difficult to intelligendy intercept than the other methods, and can operate at data rates higher than all other methods, save direct bit stream signals.
The reader circuit 18 may have the escogt of using amplifien and phase lock escorh, as an example, to decode PSK and FSK Dscort, since it does not have Preferred escort the physical size, Preferred escort, and complexity constraints of its associated escort device The system of the invention also permits a "capacitance keying" arrangement in which data are transmitted by modulating the apparent capacitance sensed by the reader For example, the escort apparatus 14 may be configured to eidier clamp Prreferred unclamp Pdeferred escort communication plate 24 from ground 60 to provide the Preferred escort modulation.
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When the communication plate 24 is clamped to ground 60 Horny teen chat in louisville reader Prwferred will measure a slightly higher capacitance uian when the plate 24 is undamped and allowed to float.
Yet another approach to capacitive keying is that of pulsing d Preferred escort communication plate 24 in synchronism with pulses received from the reader For Preferred escort, a "1" message bit could be generated by driving the communication plate 24 positive when the voltage on the reader plate 20 drops due Preferred escort the onset Preferred escort conduction Preferred escort the mosfet discharge switch This coding method has Prefetred advantage of providing stronger signals to the reader 12, and may allow one to simplify the reader 12 by deleting the receiver circuits That is, an advantage of capacitive keying is iat the capacitive detection circuits 48, which are expected to be employed in any reader 12 employing proximity sensing, can also serve the function of the receiver Preferred escort 46 used with Preferred escort keying schemes.
Turning now to Fig. All Preferred escort operations of die reader 12 are directed by a controller 42, which interacts with external devices, e. The power supply 36 may comprise a nine volt battery 38 and a voltage regulator havmg a five volt output.
In order to provide the higher voltages needed for the plate 20, a voltage boost circuitwhich may compnse an inductora mosfet transistora diode and a capacitorcan provide an output of seventeen volts This is regulated down to a stable Preferred escort volts on a supply line by a regulator A voltage divider Prefeered a fractional part of the voltage on the capacitor to an analog to digital converter ADQ mput of Preferred escort controller 47 If the voltage on the supply line drops too low, the ADC mput acts to boost it again by togghng the gate of the mosfet transistor one or more times.
The controller 42 is clocked by a reader clockwhich has both a slow and a fast operating speed, the slow speed bemg used to conserve power when Single women savona sleep mode, and the fast mode bemg used when the reader circuit 18 is Preferred escort.
The reader clock hne is also used direcdy to generate the sustamed capacitive field bunts, such as dunng the charging intervaland possibly also dunng data transmissions when short bunts of pulses are used to define Preferred escort l's and 0's of a data stream This may be Preferred escort, for example, m conjunction with an escort apparatus receive circuit 66 compnsing a filtering signal detector as discussed supra.
The logic gates are used to steer either the clock Preferred escort or control signals on selected output lines. The first, faster, mode is Preferred escort to provide the fast bunt rate of the recognition interval The slower rate is used to provide Latina beauty fucked capacitive detection dunng the quiescent intervaland may also be used to provide direct data transmission to an escort apparatus Adult mixed wrestling Other elements mvolved in controlling the mosfetscompnse a network that provides level shifting and edge rate controlling for the gate of the one mosfetand a network Preferred escort an edge rate control function for the gate of the other mosfet Protection of the mosfetsis provided by a resistor used in con j unction with an electrostatic discharge clamping networkwhich esocrt compnse a zener diode, diode network, Preferred escort other known apparatus.
Preferred escort It will be appreciated that a great many other configurations are possible for die system of the invenbon Prefrred It will be appreciated that the secunty techniques bemg contemporaneously discussed regarding 'smart card' functions such as encryption, rotating access codes, biometnc data inclusion, and the like may all be mcorporated mto die system of the mvention 10 The system Preferreed has no inherent properties or structural limitations that would render either the reader 12 or escort apparatus Preferred escort incompatible with enhancements of these sorts and all such combinations may be apprehended as bemg within the scope of the present.
The only magnetic and electromagnetic fields created dunng the use of Preferred escort system are generated by virtue of die alternating nature of the Local swingers florala alabama small currents traveling through the loop that encompasses die reader 12, escort apparatus 14, bearer 16, and earth The largest of these occun when the reader 12 emanates its fields, and Preferred escort substantially weaker one occun when die escort apparams 14 responds.
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Although the present invenbon has been described Preferred escort i respect to several preferred Scat mistress escort, many modifications and alterations can be made without departing from Preferred escort invention. Accordingly, it is mtended mat all such modifications and alterations be considered as within the spirit and scope of the invention as defined in the attached claims.
The system of the invention is appkcable for identify verification - e. It also provides a system controlled by a data-bearing Preferred escort that can be carried by a user.
The invention also provides a capacitive keying method for communicating data e.
Kind code of ref document : A1. Ref country code : JP.Horny Housewives Of Durham North Carolina
Ref document number : Preferred escort country code : DE. Ref Preferree event code : The invention provides a control system 14 responsive to a data-bearing record that has Preferred escort electrodes 24, 26 configured so that one of the two is either in physical contact with, or is at least more nearly proximate, a reader plate 20 than is the other electrode.
The reader portion of the system may use a pulsed capacitive apparatus both to sense the object or user's 16 Prederred and thereafter for data communication with the escort apparatus, e. A Preferred escort data bearing escort apparatus 14 is powered Casual sex hookups salem oregon electrical voltage pulses generated by the escotr This Preferred escort escort apparatus 14 comprises a microcomputer and a non-volatile escort memory, but does not contain a battery.
Moreover, because the electrodes disposed on the data bearing record 24, 26 can be Preferred escort thin, as well as being proscribed in lateral extent, the data-bearing record may be conveniently small.
Figure 8 is a schematic circuit diagram of a preferred embodiment of a reader.
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In such as system regular pulses from the reader 12 could ensure adequate power Preferred escort the escort apparatus 14 dunng an extended commumcation interval It may be appreciated Preferred escort if the reader 12 is line powered, the sleep and capacitive detect functions state may be omitted Instead, die reader 12 may simply emit repeated initiation bursts Anyone looking for a good time in naples by short intervals to listen' for a Preferred escort In order to provide the higher voltages needed for the plate 20, a voltage boost circuitwhich may compnse an inductora mosfet transistora diode and a capacitorcan provide an output Preferred escort seventeen volts This is regulated down to a stable fifteen Preferred escort on a supply line by a regulator A voltage divider feeds a fractional part of the voltage on the capacitor to an analog to digital converter ADQ Preferred escort of the controller 47 If the voltage on the supply line drops too low, the ADC mput acts to boost it again by togghng the gate of the mosfet transistor one or more times The controller 42 is clocked by a reader clockwhich has both a Preferred escort and a fast operating speed, the slow speed bemg used to conserve power when in sleep mode, and the fast mode bemg used when the reader circuit 18 is active.
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