WO2002032150A2 - Dispositif de communication infrarouge, systeme et procede associes - Google Patents

Dispositif de communication infrarouge, systeme et procede associes Download PDF

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Publication number
WO2002032150A2
WO2002032150A2 PCT/IL2001/000945 IL0100945W WO0232150A2 WO 2002032150 A2 WO2002032150 A2 WO 2002032150A2 IL 0100945 W IL0100945 W IL 0100945W WO 0232150 A2 WO0232150 A2 WO 0232150A2
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WO
WIPO (PCT)
Prior art keywords
infra
red
port
modulator
reflector
Prior art date
Application number
PCT/IL2001/000945
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English (en)
Other versions
WO2002032150A3 (fr
Inventor
Nir Karasikov
Original Assignee
Orit Technological R & D Center Ltd.
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 Orit Technological R & D Center Ltd. filed Critical Orit Technological R & D Center Ltd.
Priority to AU2002212634A priority Critical patent/AU2002212634A1/en
Publication of WO2002032150A2 publication Critical patent/WO2002032150A2/fr
Publication of WO2002032150A3 publication Critical patent/WO2002032150A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1149—Arrangements for indoor wireless networking of information

Definitions

  • the present invention relates to infra-red communication and more particularly but not exclusively to efficient infra-red communication involving mobile devices.
  • IR communication in portable devices is becoming more popular. Many new devices with IR communication ports are being introduced, among them Palm computers, Cellular telephones, computer keyboards etc. and the number of applications, for such devices, that make use of the IR port are increasing. In many such applications, information download from portable devices to stationary devices is facilitated. Many of the devices using IR communication are portable, which means to say battery powered, devices,
  • the standard IR port today comprises one or more IR diodes mounted in
  • the portable device which transmit information using one of the known
  • an infra-red port for communicating using infra red to a remote port comprising:
  • an infra-red receiver for receiving infra red radiation
  • a modulator associated with said receiver, for modulating said infra red radiation to carry data
  • a reflector associated with said modulator, for redirecting said modulated infra-red radiation to carry said modulated radiation to said remote port, thereby passively communicating with said remote port.
  • the port preferably comprises an infra-red diode for active infra-red transmission.
  • the port preferably comprises control functionality to initiate
  • said handshake procedure is operable to determine whether said remote port belongs to a portable or a fixed device.
  • said handshake procedure is operable to determine, if said remote port belongs to a mobile device, what a current battery power state of said mobile device is.
  • said control functionality is operable to assign a role of active communicator to whichever one of a device associated with said infra- red port and the device associated with said remote port has a higher current battery power state.
  • said control functionality is operable to assign a role of active communicator to whichever one of a device associated with said infrared port and the device associated with said remote port is a fixed device.
  • said modulator comprises a capacitive microphone.
  • said modulator comprises a piezoelectric transducer.
  • said reflector comprises a reflecting layer.
  • said reflector comprises a liquid crystal unit.
  • said reflecting layer comprises stripes of reflecting material interspersed with non-reflecting material.
  • said reflecting layer is superimposed on a second layer
  • said modulator comprises a piezoelectric actuator associated
  • said piezoelectric actuator is located laterally of said one of said layers.
  • said piezoelectric actuator is associated with said reflecting layer.
  • said piezoelectric actuator is arranged to cause bending of said one of said layers.
  • said piezoelectric actuator is associated with said reflecting layer.
  • said receiver, and said reflector together comprise a lens having a focal point, and a mirror, and wherein said mirror is located at said focal point.
  • said reflector comprises said mirror and said modulator
  • said modulator comprises a control mechanism associated with said mirror for causing vibrations of said mirror.
  • said modulator comprises polarizing filters located in front of said mirror, said polarizers being controllable to variably polarize incident radiation.
  • said modulator comprises an aperture controller for controlling the aperture of said lens.
  • said aperture controller comprises a first layer having transparent stripes interspersed with absorbing stripes.
  • said aperture controller further comprises a second layer having stripes of absorbing material interspersed with transparent regions, said first and said second layers being superimposed on each other.
  • said aperture controller comprises an LCD unit.
  • said receiver, and said reflector together comprise a lens having a focal point, and a liquid crystal panel and wherein said liquid crystal panel is located at said focal point.
  • said liquid crystal panel is controllable via associated control circuitry to provide variable reflectance, thereby to provide said modulator.
  • said reflector comprises a corner cube.
  • said modulator comprises a MEMS optical switch.
  • said MEMS optical switch is a thermal effect MEMS optical switch.
  • said MEMS optical switch is an electrostatic force MEMS optical switch.
  • said reflector comprises a liquid crystal panel arranged in patterns of reflecting and non-reflecting regions, and said modulator comprises control circuitry associated with said panel to rearrange said patterns.
  • the port preferably is operable to be used in data recording.
  • the port may be located in a sensor device, for providing communication between said sensor device and said remote port.
  • the sensor device may be an elongated marker type sensor device.
  • a passive infra-red detection port for scanning a region comprising:
  • an infra-red receiver for receiving infra red radiation from an external source
  • a modulator associated with said receiver, for modulating said infra red radiation to detect intrusion events
  • a reflector associated with said modulator, for redirecting said modulated infra-red radiation to scan said region.
  • the port preferably comprises an active detection IR emitter for emitting short IR pulses and further comprising a detector for detecting the reflected signal.
  • said reflector comprises a scanning mirror for scanning said
  • said modulator is operable to modulate said beam to a frequency of substantially 10Hz.
  • infra-red communication system for providing communication between at least a first device and a second device, each device comprising an infra-red communication port, at least the communication port of the first device comprising:
  • an infra-red receiver for receiving infra red radiation
  • a modulator associated with said receiver, for modulating said infra red radiation to carry a data
  • a reflector associated with said modulator, for redirecting said modulated infra-red radiation to carry said data to said remote port, thereby passively communicating with the communication port of the second device.
  • At least one of said communication ports further comprises an infra-red diode for active infra-red transmission.
  • At least one of said communication ports comprises control functionality to initiate communication with said other port using said infra-red diode and to carry out a handshake procedure with said other port to determine
  • said handshake procedure is operable to determine whether communication can be continued passively.
  • said handshake procedure is operable to determine whether communication can be continued passively.
  • said other port belongs to a portable or a fixed device.
  • said handshake procedure is operable to determine, if said
  • said control functionality is operable to assign a role of active communicator to whichever one of a device associated with said infrared port and the device associated with said other port has a higher current power state.
  • said control functionality is operable to assign a role of active communicator to whichever one of said ports is associated with a fixed device.
  • said modulator comprises a capacitive microphone.
  • said modulator comprises a piezoelectric transducer.
  • said reflector comprises a reflecting layer.
  • said reflector comprises a liquid crystal layer.
  • said reflecting layer comprises stripes of reflecting material interspersed with non-reflecting material.
  • said reflecting layer is superimposed on a second layer
  • said modulator comprises a piezoelectric actuator associated
  • said piezoelectric actuator is located laterally of said one of said layers.
  • said piezoelectric actuator is associated with said reflecting layer.
  • said piezoelectric actuator is arranged to cause bending of said one of said layers.
  • said piezoelectric actuator is associated with said reflecting layer.
  • said receiver, and said reflector together comprise a lens having a focal point and a mirror and wherein said mirror is located at said focal point.
  • said reflector comprises said mirror
  • said modulator comprises control circuitry associated with an actuator to vibrate said mirror.
  • said modulator comprises polarizing filters located in front
  • said polarizers being controllable to variably polarize incident radiation.
  • said modulator comprises an aperture control mechanism
  • said receiver, and said reflector together comprise a lens having a focal point, and a liquid crystal panel and wherein said liquid crystal panel is located at said focal point.
  • said liquid crystal panel is controllable to provide variable reflectance, thereby to provide said modulator.
  • said reflector comprises a corner cube.
  • said modulator comprises a MEMS optical switch.
  • said MEMS optical switch is a thermal effect MEMS optical switch.
  • said MEMS optical switch is an electrostatic force MEMS optical switch.
  • said reflector comprises a liquid crystal panel arranged in
  • said modulator comprises control circuitry associated with said panel to rearrange said patterns.
  • one of said devices is a sensor device, and another of said devices comprises sensor processing functionality.
  • an infra-red communication method comprising:
  • the method preferably further comprises receiving said modulated beam at said first location.
  • the method preferably further comprises receiving said modulated beam at a third location.
  • said modulating comprises changing a level of reflectance spatially over said beam.
  • said modulating comprises changing a level of reflectance temporally in said beam.
  • the method preferably further comprises a handshake procedure of determining at one of said locations whether to operate as a beam source or as a beam reflector.
  • said handshake procedure comprises basing said
  • said first location comprises a control device and said second location comprises a remote sensor.
  • modulating said beam comprises dynamically altering a reflectance level of a surface on which said beam is incident.
  • modulating said beam comprises dynamically vibrating a surface on which said beam is incident.
  • modulation is controllable to carry data according to the Bluetooth protocol.
  • the modulation is controllable to carry data according to the IrDA protocol.
  • a passive infra-red communication method comprising:
  • said reflecting comprises directing said beam at said external location.
  • said reflecting comprises directing said modulated beam at a third location.
  • said modulating comprises changing a level of reflectance spatially over said beam.
  • said modulating comprises changing a level of reflectance temporally in said beam.
  • the method preferably further comprises an initializing procedure of:
  • said handshake procedure comprises basing said determination on a comparison of power supply states with said external location.
  • modulating said beam comprises dynamically altering a reflectance level of a surface on which said beam is incident.
  • the method preferably further comprises modulating said beam by dynamically vibrating a surface on which said beam is incident.
  • said modulation is controllable to carry data according to the Bluetooth protocol.
  • a passive modulator and retro-reflector comprising:
  • a beam receiver for receiving an external beam
  • a beam modulator located downstream of said beam receiver for modulating said externally received beam
  • a retro -reflector for retro-reflecting said modulated beam back via said beam receiver.
  • the device is prefearbly tunable for an infra-red beam.
  • the device further comprises an infra-red diode for active
  • the device preferably comprises control functionality to initiate communication with a remote port using said infra-red diode and to carry out a handshake procedure with said remote port to determine whether communication can be continued passively.
  • said handshake procedure is operable to determine whether said remote port belongs to a portable or a fixed device.
  • said handshake procedure is operable to determine, if said remote port belongs to a mobile device, what a current power state of said
  • control functionality is operable to assign a role of
  • said control functionality is operable to assign a role of active communicator to whichever one of a device associated with said infra- red port and the device associated with said remote port is a fixed device.
  • said modulator comprises a capacitive microphone.
  • said modulator comprises a piezoelectric transducer.
  • said retro-reflector comprises a reflecting layer.
  • said retro-reflector comprises a liquid crystal layer.
  • said reflecting layer comprises stripes of reflecting material interspersed with non-reflecting material.
  • said reflecting layer is superimposed on a second layer comprising stripes of non-reflecting material interspersed with transparent material.
  • said modulator comprises a piezoelectric actuator associated
  • said piezoelectric actuator is located laterally of said one of
  • said piezoelectric actuator is associated with said reflecting layer.
  • said piezoelectric actuator is arranged to cause bending of said one of said layers.
  • said piezoelectric actuator is associated with said reflecting layer.
  • said receiver, and said retro-reflector together comprise a lens having a focal point, and a mirror, and wherein said mirror is located at said focal point.
  • said retro-reflector comprises said mirror and said modulator comprises a control mechanism associated with said mirror for causing vibrations of said mirror.
  • said modulator comprises polarizing filters located in front of said mirror, said polarizers being controllable to variably polarize incident radiation.
  • said modulator comprises an aperture controller for controlling the aperture of said lens.
  • said aperture controller comprises a first layer having stripes of transparent material interspersed with absorbing material.
  • said aperture controller further comprises a second layer
  • said aperture controller comprises an LCD unit.
  • said receiver, and said retro-reflector together comprise a lens having a focal point, and a liquid crystal panel and wherein said liquid crystal panel is located at said focal point.
  • said modulator comprises control circuitry associated with said LCD panel to provide variable reflectance in said modulator.
  • said retro-reflector comprises a corner cube.
  • said modulator comprises a MEMS optical switch.
  • said MEMS optical switch is a thermal effect MEMS optical switch.
  • said MEMS optical switch is an electrostatic force MEMS optical switch.
  • said modulator comprises a liquid crystal panel arranged in
  • the device may for example be located in a sensor device, for providing
  • Such a sensor device may be an elongated marker type sensor device.
  • an infra-red based remote control unit for remotely controlling a device, the unit comprising:
  • an infra-red receiver for receiving infra red radiation from said device
  • a modulator associated with said receiver, for modulating said infra red radiation with control data for said device
  • a reflector associated with said modulator, for redirecting said modulated infra-red radiation to carry said modulated radiation to said device, thereby to passively control said device.
  • an infra-red relay unit for relaying a communicating using infra red to a remote port, the infra-red relay unit comprising:
  • an infra-red receiver for receiving modulated infra red radiation from one source and unmodulated infrared radiation from another source
  • a modulator associated with said receiver, for modulating said unmodulated infra red radiation with data carried by said modulated radiation to form a relay beam
  • a reflector associated with said modulator, for redirecting said relay
  • Fig. 1 is a simplified block diagram showing an office with IR capability
  • Fig. 2 is a simplified block diagram of an IR port according to a
  • Fig. 3 is a simplified block diagram of another IR port according to a
  • Fig. 4 is a simplified block diagram of an IR port having handshake control according to a preferred embodiment of the present invention
  • Fig. 5 is a simplified schematic diagram of an IR communication channel using a PMRF mode according to a preferred embodiment of the present invention
  • Fig. 6 is a simplified schematic diagram of a modulation device according to a preferred embodiment of the present invention.
  • Fig. 7 is a simplified schematic diagram showing construction details of internal layers of a modulation device according to a preferred embodiment of the present invention.
  • Fig. 8 is a simplified schematic diagram of a palm marker type sensor operative in accordance with a preferred embodiment of the present invention.
  • Fig. 9 is a simplified schematic diagram showing a modification of an IR port according to a preferred embodiment of the present invention for use as a security sensor, and
  • Fig. 10 is a simplified flow chart showing a procedure for carrying out passive communication according to a preferred embodiment of the present invention.
  • Embodiments of the present invention provide a method and apparatus
  • An IR source for communication is preferably located in a stationary or mains operated device, for example a fixed Bluetooth or IrDA unit for example in an office, or at a pay in kiosk or a terminal for
  • the IR source In the office mode, for example the IR source is mounted in a central location in a room, such as the ceiling, allowing communication between all devices equipped with the PMRF technology.
  • the IR radiation is modulated by the portable device and the modulated information is retro-reflected to the stationary device where it is detected and decoded, thereby providing a two way IR communication channel in which only one of the devices needs to provide an active IR source.
  • the advantage of the PMRF technique is that the energy required to modulate the IR beam is much lower than the energy required to transmit the IR beam. The useful battery life of the portable device is thus considerably extended.
  • active IR communication consumes milliamperes of current
  • passive modulation as will be described hereinbelow may consume current in the microamperes range.
  • Fig. 1 is a simplified block diagram showing an infra-red communication link according to a first preferred embodiment of the present invention.
  • a central IR infra-red communication link
  • the communication unit 10 is located in a convenient location of an office for line of sight connection throughout the office. Such a central unit 10 may preferably be located in the ceiling. Two remote devices 12 and 14 are located in the office and have line of sight connection to the central unit 10. The central unit 10 thus connects the remote devices to each other and to any other devices linked to the central unit, thereby providing a flexible intranet.
  • the remote connection is made using IR radiation and conventional IR connections have the disadvantage of high battery drain on mobile devices.
  • the only device that uses active IR signal generation is the central unit 10.
  • the other devices 12 and 14 do not generate their own IR source but rather use passive modulation with retro reflection, which is to say that they modulate and reflect IR radiation from the central unit 10, as will be explained in more detail below.
  • FIG. 2 is a simplified block diagram showing a preferred embodiment of an IR port suitable for use in the devices
  • an IR port 16 comprises an infra-red receiver 18
  • a modulator 20 for receiving infra red radiation, a modulator 20 (connected to the receiver in
  • receiver and outgoing communication data is modulated onto an externally produced IR signal which is then reflected to the communication target, generally but not necessarily the same place as the source of the IR beam.
  • the port has two modes of operation, a mode of modulation of the retro-reflected beam by the data back to the source of the beam; and a relay mode in which the receiver detects an DR. signal carrying information, sends the information to the modulator which modulates it on to another beam which is retro-reflected.
  • the reflector, modulator and reflector may be physically embodied as three or more separate components, or two separate components or as a single component carrying out all of the functions.
  • FIG. 3 shows an alternative embodiment of the infra-red port of Fig. 2. Parts that appear in earlier figures are given the same reference numerals and are not discussed in detail again except as needed for an understanding of the present embodiment.
  • port 24 comprises the same receiver, modulator and reflector as in that of Fig. 2 but additionally comprises an active IR diode for active infra-red transmission.
  • the diode may be used to provide an active IR source for data transmission, so
  • the port may be used, for example, to initiate communication, or in any other circumstances when passive communication is judged not to be optimal,
  • Fig. 4 is a simplified block diagram
  • the IR port of Fig. 4 is able to operate in both passive and active modes.
  • the handshake control allows the port to take different circumstances into account in deciding which mode to select. For example if the port is attached to a fixed device, that is a device attached to mains power then the port would usually wish to operate actively, since power usage is not a matter of concern. If the port is attached to a mobile, that is battery powered, device then it may normally wish to operate in passive mode in order to save power. If however it is attached to a mobile device and is also communicating with a mobile device, then the handshake procedure may allow for the two devices to negotiate which has the lower battery charge. The device determined to be operating with the lower charge may be set to operate in passive mode. The handshake controller thus allows the device to interrogate another device with which it is communicating to determine whether active or passive communication is the most suitable mode in the circumstances.
  • the handshake procedure may thus include functionality to determine whether the remote port belongs to a portable or a fixed device. If the remote
  • port belongs to a fixed device and the present device is a portable device then
  • the remote port is told to communicate actively and the present device is told to
  • both devices are portable devices then preferably a further stage in the handshake procedure determines which of the devices has
  • the lower power level or lower power reliability selects that device as the
  • both devices are fixed devices then either both devices can communicate actively or one of the devices is selected by default
  • such a handshake may comprise a device ID from the initiating device, followed by each device revealing whether it is mains or battery powered followed by battery powered devices indicating their battery status. Based on the information exchanged, either the initiating or receiving device as desired may decide which of the devices is to be the active communicator. The handshake stage is preferably completed rapidly and one of the devices is then able to enter passive mode.
  • the central unit may routinely transmit IR signals, simply allowing all responding devices to be in passive mode.
  • FIG. 5 is a simplified block diagram of a communication channel between active and passive infra-red ports.
  • An active IR port 32 comprises an IR source 34 and an IR detector 36.
  • a passive IR port 32 comprises an IR source 34 and an IR detector 36.
  • IR port 38 is in line of sight relationship with the active IR port 32 and comprises a lens 40 for focusing incoming IR radiation and a modulator/reflector 42 for modulating the IR with data and reflecting
  • the IR source 34 produces IR radiation which is emitted in
  • the radiation is focused by the lens 40
  • the passive port 38 is able to transmit data whilst substantially relying on the energy of the active port 32.
  • an infra-red port comprises a lens 40 for receiving an incoming beam, and a modulator/reflector 42 located at the focus of lens 40.
  • the modulator/reflector retro reflects incident IR back to the source. Modulation of the light may be achieved using
  • a motion based modulator may typically be achieved using a piezoelectric layer.
  • a motion based modulator is shown schematically in Fig. 7. In Fig. 7 two layers are shown, a front layer 44 and a back layer 46. The front
  • layer 44 comprises a series of non-reflecting stripes 48 interspersed with
  • the back layer 46 comprises a series of reflecting stripes 52 interspersed by non-reflecting regions 54.
  • the geometries of the stripes and intervening regions in the two layers are substantially identical.
  • the layers preferably take two relative positions, a maximum reflectance position in which the reflecting stripes 52 of the back layer 46 coincide with the transparent regions 50 of the front layer 44, and a minimum reflectance position in which the non-reflecting regions 54 of the back layer 46 coincide with the transparent regions 50 of the front layer 44.
  • the reflector/modulator 42 thus serves as a binary modulation system. The amount of energy needed to carry out the modulation is minimal since the total motion that is needed is that of the width of the stripes. That is to say a high modulation range is achievable using motion which is very much smaller than
  • Motion may be provided by attaching a
  • piezoelectric actuator to one of the layers. Such actuators are able to provide sub-millisecond response times.
  • a variation on the above approach is to provide the back layer 46 with a
  • piezoelectric bending device Bending of the back layer rather than moving it from side to side causes the desired modulation.
  • An advantage of the piezoelectric bending device is that the actuator may be placed in line with the
  • a piezoelectric transducer is preferably attached to a lateral side of the surface, thereby increasing the lateral footprint.
  • MEMS optical switches include both thermal effect and electrostatic force based switches it is expected that other MEMS techniques could be used as well.
  • liquid crystal modulation avoids mechanical motion and thus is even less power consuming. Furthermore it offers wider bandwidth.
  • a single liquid crystal activated or deactivated as a single body is also a possibility.
  • a capacitive microphone is another modulation technique. Applying voltage across a vacuum capacitor yields the required modulation. Bandwidth higher than 20 kHz may be attained in this manner.
  • the modulator comprises polarizing filters located in front of the mirror 42.
  • the polarizers are preferably rotatable and can be used to alter the amount of reflected radiation emitted.
  • the reflector/modulator is a corner cube.
  • an arrangement according to the present invention may provide the infrastructure for a flexible local intranet, typically using the Bluetooth protocol (or IrDA) on an IR link with central unit 10 providing connectivity for the entire space.
  • IrDA Bluetooth protocol
  • central unit 10 providing connectivity for the entire space.
  • PMRF passive communication and the PMRF technique, it is possible for portable devices to operate infra-red communication links using microwatt power levels as opposed to the milliwatts required by prior art methods. It is therefore feasible for small devices such as cellular phones and PDAs to benefit from being connected to the local intranet without their power usage being greatly affected.
  • a sensor device 60 comprises
  • sensing circuitry 62 processing capacity 64 and a piezoelectric device 66 (or
  • Data is obtained by the sensing circuitry 62, processed by the processor 64 and modulated by the piezoelectric device onto
  • a remote station may be used as a remote station in line of site communication with a central controller which may be the central unit 10 of a Bluetooth or IrDA based
  • intranet or it may be PDA or palmtop or any other device capable of controlling or monitoring a. sensor.
  • the sensor thus operates with considerably reduced battery consumption.
  • the remote sensor 60 is configured in the shape of the standard Palm marker, and such a configuration is shown in Fig. 8.
  • space is of high importance and the PMRF technique is valuable since it has a narrow footprint.
  • the remote sensor 60 uses the PMRF modulation technique, the PDA itself functions as the stationary device, using its active IR source to establish and maintain the communication link.
  • the interface of the remote sensor to the Palm may be via direct link
  • the remote sensor preferably has data storage capabilities and hence can download the stored data when it is interfaced to the PDA docking station.
  • remote sensor applications include temperature measurement, acoustic sensing, video photography, security sensing, and
  • An advantage of the PDA and remote sensor embodiment lies in the
  • the remote device need not be a sensor, but could also be any other device that may be remotely communicated with using an IR link by the PDA or central unit, such as a printer, cellular phone, laptop computer etc.
  • a PDA 70 or any other device is provided with an IR port 72 capable of using PRMF techniques.
  • the port 72 is shown enlarged in the lower part of the figure.
  • the port comprises an active or passive IR source 74.
  • a passive IR source that means that an IR beam is obtained from another active device.
  • a a wide field of view beam covers a space over which detection is required.
  • the IR beam is emitted at a frequency
  • An algorithm in the PDA or palmtop may analyze the detected signal.
  • a change in the pattern of the detected signal generally indicates a change in
  • One preferred embodiment uses such a security mode when the palm is positioned in its docking station.
  • the security mode may ensure that nobody attempts to take the device and download confidential information.
  • Two preferred options are available for scanning the detection beam, volumetric coverage, for cases where intruders can be expected from a wide angle, or linear coverage, where there is a clear direction from which the intruder can arrive.
  • the selection between the two modes may affect the type of optics used.
  • PMRF can be used in a relay to overcome range and line of sight limitations.
  • Fig. 10 is a simplified flow chart of a
  • the method begins with initiation of the communication, by either the local or a remote port. Generally initiation is carried out actively.
  • initiation is carried out actively.
  • the exception is the case of a central unit permanently monitoring for devices in a space such as an office, where the devices in the office may initiate communication passively by responding to a monitoring beam.
  • Initiation is preferably followed by a handshake procedure in which the local and remote port negotiate which is to be the passive and which the active communicator.
  • the handshake procedure is preferably dispensed with in cases such as that of the central unit, which is set up as a default active communicator.
  • the handshake procedure generally selects the device having the better or more reliable power supply as the active communicator and the device having the weaker or less reliable power supply as the passive communicator.
  • the local device If the local device is set up as the active communicator then it proceeds to communicate actively in the normal way, as in the prior art by producing an
  • the passive device can use the beam. If the local device is set up, by the handshake procedure or otherwise, as
  • the passive communicator then the system waits until a beam is received from the remote device.
  • the received beam is modulated with data to be

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  • Physics & Mathematics (AREA)
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Abstract

L'invention concerne un port infrarouge permettant de communiquer par infrarouge avec un port à distance. Le port infrarouge comprend: un récepteur infrarouge conçu pour recevoir le rayonnement infrarouge; un modulateur associé au récepteur, conçu pour moduler le rayonnement infrarouge de manière à acheminer la communication; et un réflecteur associé au modulateur, conçu pour rediriger le rayonnement infrarouge modulé de manière à acheminer la communication vers le port à distance, permettant ainsi la communication passive avec le port à distance. La présente invention concerne également une unité de commande à distance passive et une liaison relais passive.
PCT/IL2001/000945 2000-10-12 2001-10-11 Dispositif de communication infrarouge, systeme et procede associes WO2002032150A2 (fr)

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AU2002212634A AU2002212634A1 (en) 2000-10-12 2001-10-11 Infra-red communication apparatus, system and method

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US23985300P 2000-10-12 2000-10-12
US60/239,853 2000-10-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1836784A1 (fr) * 2004-12-17 2007-09-26 Totalförsvarets Forskningsinstitut Dispositif de telesurveillance optique et systeme comprenant ledit dispositif

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