WO2006123089A2 - Video display - Google Patents

Video display Download PDF

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Publication number
WO2006123089A2
WO2006123089A2 PCT/GB2006/001340 GB2006001340W WO2006123089A2 WO 2006123089 A2 WO2006123089 A2 WO 2006123089A2 GB 2006001340 W GB2006001340 W GB 2006001340W WO 2006123089 A2 WO2006123089 A2 WO 2006123089A2
Authority
WO
WIPO (PCT)
Prior art keywords
display
unit
marker
signal
video
Prior art date
Application number
PCT/GB2006/001340
Other languages
French (fr)
Other versions
WO2006123089A3 (en
Inventor
Timothy Robin North
Christopher Robert Hawes
Original Assignee
Timothy Robin North
Christopher Robert Hawes
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 Timothy Robin North, Christopher Robert Hawes filed Critical Timothy Robin North
Publication of WO2006123089A2 publication Critical patent/WO2006123089A2/en
Publication of WO2006123089A3 publication Critical patent/WO2006123089A3/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q30/00—Commerce
    • G06Q30/02—Marketing; Price estimation or determination; Fundraising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
    • H04N17/045—Self-contained testing apparatus

Definitions

  • This invention relates to video display, and is concerned with video display units and systems and methods of monitoring the functioning of such units and systems.
  • a video display unit for providing a display in accordance with a video signal input to the unit, wherein the unit includes means for adding a marker signal to the input video signal for representation in the display, sensor means for responding to the representation of the marker signal in the display, and detector means for detecting whether the marker representation is sensed by the sensor means .
  • the video display unit of the invention is of advantage particularly (though not exclusively) in those circumstances where the video display unit is to be used to display a sequence of images, for example advertising images, in a public environment where it is unattended.
  • the detecting means may be used in this context for monitoring the proper functioning of the display unit in verifying that the images have been or are being displayed.
  • a method of monitoring the functioning of a video display unit wherein a marker signal is added to the video signal input to the unit, and the presence or absence of sensing by sensor means of representation of this marker signal in the display, is detected.
  • the marker signal used in the video display unit and method of the invention may be added to the video signal input in such a manner that the marker representation appears in a specific location of the display.
  • the sensor means which may be a photo-responsive device such as a photodiode or phototransistor, may be positioned in the region of this specific location for responding to the presence of the marker representation in the display.
  • the marker representation which may be a flashing cursor, may provide an analogue or digital signature or identifier for recognition by the detector means.
  • a marker representation that provides an analogue or digital signature or identifier is of advantage where the video display unit is part of a system involving a plurality of such units, and may be used, for example, where monitoring of the proper functioning of the individual video display units is to be carried out from a central station common to them all.
  • a video display system comprises: a plurality of video display units each for providing a display in accordance with a video signal input to the respective unit; means for adding a marker signal to the input video signal of each individual unit for representation in the display of that respective unit, each unit including sensor means for responding to the representation of the marker signal in the display of that respective unit; and detector means for detecting in respect of each individual unit whether the marker representation is sensed by the sensor means of that unit.
  • a method of monitoring the functioning of a plurality of video display units wherein a marker signal is added to the video signal input to each individual video display unit, and the presence or absence of sensing by sensor means of representation of this marker signal in the display of the respective display unit, is detected.
  • the same or different video signals may be input to different ones of the video display units, and the marker signal added to the input video signal may be the same or different for different ones of the units.
  • the marker signal added to the video signal input to each respective video display unit may be individual to that unit and may provide an analogue or digital signature or identifier individual to that unit.
  • the invention in all the above aspects is applicable with advantage where sequences of advertisements are to be displayed, for example in one or more shopping centres or other public places, for verifying that the advertisements are being faithfully displayed by video display units in all those places, and/or providing alarm or other response where display by any of those units is for any reason interrupted or otherwise impaired.
  • Figure 1 is a schematic representation of the video display system of the invention.
  • FIG 2 is a schematic representation of a typical video display unit according to the invention, used in the video display system of Figure 1.
  • the example of video display system to be described is for use in displaying sequences of advertisements to the public in shopping centres, and will be described in the context of the distribution of the video signals required for display of those advertisements, to four shopping centres .
  • the four shopping centres 1 to 4 receive the video signals from a server 5 at a central station via a wide area network 6.
  • Each shopping centre 1 to 4 includes equipment for displaying the sequences of advertisements conveyed by the video signals, and the equipment provided in each centre 1 to 4 in this respect is illustrated in Figure 1 typically for the centre 4 alone.
  • the video signals from the network 6 are received by a server 7 in the shopping centre, and are supplied from it to a distribution amplifier 8 for distribution to receiver amplifiers 9 associated respectively with three video display units 10 (more or fewer than three units 10 may be provided) .
  • Each unit 10 comprises a plasma, thin- film transistor (TFT) or other video display device 11 and a verification sub-unit 12 through which the video signals received by the respective amplifier 9 are supplied for display on the screen 13 of display device 11.
  • the verification sub-unit 12 of each unit 10 is operative to add marker signals into the video signals supplied through it to its respective display device 11, so that a display representation of the marker appears in the advertisements displayed on the screen 13.
  • the appearance of the marker on the screen 13 is sensed and a signal corresponding to it is fed back to the sub- unit 12 as verification that display in accordance with the video signals supplied to the display device 11 is taking place.
  • a signal corresponding to it is fed back to the sub- unit 12 as verification that display in accordance with the video signals supplied to the display device 11 is taking place.
  • there is no display for example because of a fault in the display device 11, or it has been switched off, there will be no signal fed back and the failure to display will be revealed.
  • the display device 11 is being used to provide a display derived from video signals other than those supplied via the sub-unit 12. Accordingly, not only does the fed-back signal provide evidence that display has taken place, but its absence gives warning that something is amiss.
  • a trigger signal indicating this fact is transmitted from that sub-unit 12 to the server 7 of the shopping centre.
  • the trigger signal contains identification of the display unit 10 in which the fault or other condition leading to the interruption has occurred, and the server 7 adds its own identification to this signal before transmitting it on to the central-station server 5 via the network 6.
  • Notice of the alarm condition may be delivered from there or otherwise, for remedial action, by any information- delivery facility (for example, e-mail, telephone or a messaging service) . Furthermore, a record can be kept of at which shopping centres 1 to 4 and at which display units 10 within those centres, interruptions in advertising display have occurred.
  • information- delivery facility for example, e-mail, telephone or a messaging service
  • the video signals input to the display unit 10 from its associated amplifier 9, are passed via a video processor 21 of the sub-unit 12 to a video synchronisation-checking circuit 22. From the circuit 22 the video signals pass to a circuit 23 that adds the marker signals before the video signals are passed on through a video amplifier 24 from the sub-unit 12 to the video display device 11.
  • the signals added to the video signals in the sub-unit 12 are representative of a flashing cursor and are encoded so as to convey in the flashing a digitally-encoded identification that is unique to the respective display- unit 10; the encoding may be by number and/or flashing- frequency.
  • the added signals are synchronised to the video signals such that the flashing cursor appears in the top left-hand corner of the screen 13 of the display device 11; other corner- or marginal-locations may be used by change of the synchronisation provided within the circuit 23.
  • a photo-sensor 25 is positioned on the screen 13 in this location to respond to the cursor and supply signals in accordance with its flashing to a processor 26.
  • the processor 26, which is active through the checking- circuit 22 to ensure that synchronisation with the video signals is maintained, receives the signals from the sensor 25 and determines whether they convey the same identification code as the signals added into the video signals in the circuit 23. If they do not, the processor activates a circuit 27 to transmit the identification code to the server 7 ( Figure 1) to signal interruption of display.
  • the server 7 Figure 1
  • the identification code may be transmitted recurrently to the server 7 together with an indicator of whether or not verification of the display is taking place; a time identifier may also be added.
  • the information received by the server 7 in this case may then be stored for access periodically by the central- station server 5 via the network 6 so as to enable records for the display units 10 to be kept and maintained up-to-date.
  • the signals representative of the marker are added within the display units 10, each such unit including an individual sub-unit 12 as an integral part.
  • the signals representative of the marker are added at the source of the video signals or elsewhere in advance of the display units 10. More especially, the marker- representative signals may be added during generation of the video signals.

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  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Finance (AREA)
  • Strategic Management (AREA)
  • Development Economics (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Game Theory and Decision Science (AREA)
  • Economics (AREA)
  • Entrepreneurship & Innovation (AREA)
  • Physics & Mathematics (AREA)
  • General Business, Economics & Management (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Video display of a sequence of advertisements is provided by display units (10) in shopping centres (1-4) in accordance with video signals supplied via a wide-area network (6) . Each display unit (10) includes a sub-unit (12) for adding a marker signal into the network-supplied video signals, and a photo-sensor (25) is used to verify display of the marker, and thus of the advertising, on the screen (13) of the display unit (10) . If display of the marker is interrupted, a signal identifying the respective display unit (10) and its centre (1-4) is transmitted via the network (6) to trigger remedial action and/or logging. The added marker signal is synchronised to the input video signal to appear in a fixed screen-location, and enhanced verification of integrity of the video display includes checking whether there is correspondence between encoding detected in the displayed marker and encoding of the marker signal added to the video signals.

Description

Video Display
This invention relates to video display, and is concerned with video display units and systems and methods of monitoring the functioning of such units and systems.
According to one aspect of the present invention there is provided a video display unit for providing a display in accordance with a video signal input to the unit, wherein the unit includes means for adding a marker signal to the input video signal for representation in the display, sensor means for responding to the representation of the marker signal in the display, and detector means for detecting whether the marker representation is sensed by the sensor means .
The video display unit of the invention is of advantage particularly (though not exclusively) in those circumstances where the video display unit is to be used to display a sequence of images, for example advertising images, in a public environment where it is unattended.
The detecting means may be used in this context for monitoring the proper functioning of the display unit in verifying that the images have been or are being displayed.
According to another aspect of the invention there is provided a method of monitoring the functioning of a video display unit wherein a marker signal is added to the video signal input to the unit, and the presence or absence of sensing by sensor means of representation of this marker signal in the display, is detected. The marker signal used in the video display unit and method of the invention may be added to the video signal input in such a manner that the marker representation appears in a specific location of the display. The sensor means, which may be a photo-responsive device such as a photodiode or phototransistor, may be positioned in the region of this specific location for responding to the presence of the marker representation in the display.
The marker representation, which may be a flashing cursor, may provide an analogue or digital signature or identifier for recognition by the detector means.
The use of a marker representation that provides an analogue or digital signature or identifier is of advantage where the video display unit is part of a system involving a plurality of such units, and may be used, for example, where monitoring of the proper functioning of the individual video display units is to be carried out from a central station common to them all.
According to an additional aspect of the invention a video display system comprises: a plurality of video display units each for providing a display in accordance with a video signal input to the respective unit; means for adding a marker signal to the input video signal of each individual unit for representation in the display of that respective unit, each unit including sensor means for responding to the representation of the marker signal in the display of that respective unit; and detector means for detecting in respect of each individual unit whether the marker representation is sensed by the sensor means of that unit.
According to a further aspect of the invention there is provided a method of monitoring the functioning of a plurality of video display units, wherein a marker signal is added to the video signal input to each individual video display unit, and the presence or absence of sensing by sensor means of representation of this marker signal in the display of the respective display unit, is detected.
With the system and method of system-monitoring of the invention, the same or different video signals may be input to different ones of the video display units, and the marker signal added to the input video signal may be the same or different for different ones of the units. In particular, the marker signal added to the video signal input to each respective video display unit may be individual to that unit and may provide an analogue or digital signature or identifier individual to that unit.
The invention in all the above aspects is applicable with advantage where sequences of advertisements are to be displayed, for example in one or more shopping centres or other public places, for verifying that the advertisements are being faithfully displayed by video display units in all those places, and/or providing alarm or other response where display by any of those units is for any reason interrupted or otherwise impaired.
A video display system for use in providing verified display of advertisements, in accordance with the invention will now be described, by way of example with reference to the accompanying drawings, in which:
Figure 1 is a schematic representation of the video display system of the invention; and
Figure 2 is a schematic representation of a typical video display unit according to the invention, used in the video display system of Figure 1. The example of video display system to be described is for use in displaying sequences of advertisements to the public in shopping centres, and will be described in the context of the distribution of the video signals required for display of those advertisements, to four shopping centres .
Referring to Figure 1, the four shopping centres 1 to 4 receive the video signals from a server 5 at a central station via a wide area network 6. Each shopping centre 1 to 4 includes equipment for displaying the sequences of advertisements conveyed by the video signals, and the equipment provided in each centre 1 to 4 in this respect is illustrated in Figure 1 typically for the centre 4 alone.
The video signals from the network 6 are received by a server 7 in the shopping centre, and are supplied from it to a distribution amplifier 8 for distribution to receiver amplifiers 9 associated respectively with three video display units 10 (more or fewer than three units 10 may be provided) . Each unit 10 comprises a plasma, thin- film transistor (TFT) or other video display device 11 and a verification sub-unit 12 through which the video signals received by the respective amplifier 9 are supplied for display on the screen 13 of display device 11. The verification sub-unit 12 of each unit 10 is operative to add marker signals into the video signals supplied through it to its respective display device 11, so that a display representation of the marker appears in the advertisements displayed on the screen 13.
The appearance of the marker on the screen 13 is sensed and a signal corresponding to it is fed back to the sub- unit 12 as verification that display in accordance with the video signals supplied to the display device 11 is taking place. In the event that there is no display, for example because of a fault in the display device 11, or it has been switched off, there will be no signal fed back and the failure to display will be revealed. The same applies in the event that the display device 11 is being used to provide a display derived from video signals other than those supplied via the sub-unit 12. Accordingly, not only does the fed-back signal provide evidence that display has taken place, but its absence gives warning that something is amiss.
If there is interruption of the fed-back signal to a sub- unit 12 of any of the display units 10, a trigger signal indicating this fact is transmitted from that sub-unit 12 to the server 7 of the shopping centre. The trigger signal contains identification of the display unit 10 in which the fault or other condition leading to the interruption has occurred, and the server 7 adds its own identification to this signal before transmitting it on to the central-station server 5 via the network 6.
Notice of the alarm condition may be delivered from there or otherwise, for remedial action, by any information- delivery facility (for example, e-mail, telephone or a messaging service) . Furthermore, a record can be kept of at which shopping centres 1 to 4 and at which display units 10 within those centres, interruptions in advertising display have occurred.
The form of a typical display unit 10 will now be described with reference to Figure 2.
Referring to Figure 2, the video signals input to the display unit 10 from its associated amplifier 9, are passed via a video processor 21 of the sub-unit 12 to a video synchronisation-checking circuit 22. From the circuit 22 the video signals pass to a circuit 23 that adds the marker signals before the video signals are passed on through a video amplifier 24 from the sub-unit 12 to the video display device 11.
The signals added to the video signals in the sub-unit 12 are representative of a flashing cursor and are encoded so as to convey in the flashing a digitally-encoded identification that is unique to the respective display- unit 10; the encoding may be by number and/or flashing- frequency. The added signals are synchronised to the video signals such that the flashing cursor appears in the top left-hand corner of the screen 13 of the display device 11; other corner- or marginal-locations may be used by change of the synchronisation provided within the circuit 23. A photo-sensor 25 is positioned on the screen 13 in this location to respond to the cursor and supply signals in accordance with its flashing to a processor 26.
The processor 26, which is active through the checking- circuit 22 to ensure that synchronisation with the video signals is maintained, receives the signals from the sensor 25 and determines whether they convey the same identification code as the signals added into the video signals in the circuit 23. If they do not, the processor activates a circuit 27 to transmit the identification code to the server 7 (Figure 1) to signal interruption of display. The fact that the marker in this case is encoded and that verification of display depends on the sensor 25 correctly reproducing this code, gives the added assurance that a display representation of the video signals is taking place without break up or picture interference.
It will be appreciated that rather than transmitting the identification code to the server 7 to signal interruption of the display, that code might be transmitted from the unit 10 only while there is verification within the sub-unit 12 that display is taking place. In this latter event, interruption of transmission of this code to the server 7 is used to signify that correct display is not taking place. As a further alternative, the identification code may be transmitted recurrently to the server 7 together with an indicator of whether or not verification of the display is taking place; a time identifier may also be added.
The information received by the server 7 in this case may then be stored for access periodically by the central- station server 5 via the network 6 so as to enable records for the display units 10 to be kept and maintained up-to-date.
As described above, the signals representative of the marker are added within the display units 10, each such unit including an individual sub-unit 12 as an integral part. However, there may be circumstances where the signals representative of the marker are added at the source of the video signals or elsewhere in advance of the display units 10. More especially, the marker- representative signals may be added during generation of the video signals.

Claims

Claims :
1. A video display unit for providing a display in accordance with a video signal input to the unit, wherein the unit includes means for adding a marker signal to the input video signal for representation in the display, sensor means for responding to the representation of the marker signal in the display, and detector means for detecting whether the marker representation is sensed by the sensor means.
2. A video display unit according to Claim 1 wherein the detector means is for verifying that the images represented by the input video signal are displayed.
3. A video display unit according to Claim 1 or Claim 2 wherein the means for adding the marker signal adds it to the input video signal such that the representation of the marker appears in a specific location of the display.
4. A video display unit according to Claim 3 wherein the sensor means is positioned in the region of said specific location of the display for responding to the presence of the marker representation in that location of the display.
5. A video display unit according to Claim 4 wherein the sensor means is a photo-responsive device.
6. A video display unit according to any one of Claims 1 to 5 wherein the marker representation is a flashing cursor in the display.
7. A video display unit according to any one of Claims 1 to 6 wherein the marker signal includes an analogue or digital signature or identifier for representation in the display and recognition by the detector means .
8. A method of monitoring the functioning of a video display unit wherein a marker signal is added to the video signal input to the unit, and the presence or absence of sensing by sensor means of representation of this marker signal in the display is detected.
9. A method according to Claim 8 wherein the video display unit is for displaying a sequence of images for advertising.
10. A method according to Claim 8 or Claim 9 wherein the presence or absence of the marker signal in the display is detected for verifying that images represented by the input video signal are displayed.
11. A method according to any one of Claims 8 to 10 wherein the marker signal is added to the input video signal such that the marker representation appears in a specific location of the display.
12. A method according to any one of Claims 8 to 11 wherein the sensor means is positioned in the region of said specific location of the display for responding to the presence of the marker representation in that location of the display.
13. A method according to Claim 12 wherein the sensor means is a photo-responsive device.
14. A method according to any one of Claims 8 to 13 wherein the marker representation is a flashing cursor in the display.
15. A method according to any one of Claims 8 to 14 wherein the marker signal includes an analogue or digital signature or identifier for representation in the display and recognition.
16. A video display system comprising: a plurality of video display units each for providing a display in accordance with a video signal input to the respective unit; means for adding a marker signal to the input video signal of each individual unit for representation in the display of that respective unit, each unit including sensor means for responding to the representation of the marker signal in the display of that respective unit; and detector means for detecting in respect of each individual display unit whether the marker representation is sensed by the sensor means of that unit.
17. A video display system according to Claim 16 wherein the marker signal added to the input video signal to each respective video display unit is individual to that unit.
18. A video display system according to Claim 17 wherein the marker signal added to the input video signal to each respective unit provides an analogue or digital signature or identifier individual to that unit.
19. A video display system according to any one of Claims 16 to 18 including means for providing an alarm response in respect of any of the display units in the event that there is interruption of display of the marker representation by that unit.
20. A method of monitoring the functioning of a plurality of video display units, wherein a marker signal is added to the video signal input to each individual video display unit, and the presence or absence of sensing by sensor means of representation of this marker signal in the display of the respective display unit, is detected.
21. A method according to Claim 20 wherein the marker signal added to the input video signal to each respective video display unit is individual to that unit .
22. A method according to Claim 21 wherein the marker signal added to the input video signal to each respective unit provides an analogue or digital signature or identifier individual to that unit.
23. A method according to any one of Claims 20 to 22 wherein an alarm response is provided in respect of any of the display units in the event that there is interruption of display of the marker representation by that unit .
24. A method according to any one of Claims 20 to 23 wherein sequences of advertisements are displayed by each display unit.
PCT/GB2006/001340 2005-04-12 2006-04-12 Video display WO2006123089A2 (en)

Applications Claiming Priority (2)

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GB0507348.1 2005-04-12
GBGB0507348.1A GB0507348D0 (en) 2005-04-12 2005-04-12 Video display

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WO2006123089A3 WO2006123089A3 (en) 2007-01-25

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EP2200334A1 (en) 2008-12-18 2010-06-23 Thomson Licensing Display device with feedback elements and method for monitoring
WO2014091505A1 (en) 2012-12-11 2014-06-19 Taggalo, S.R.L. Method and system for monitoring the displaying of video contents
CN104348782A (en) * 2013-07-29 2015-02-11 樊小琴 Method ensuring correct playing of multimedia and device thereof
EP3179369A1 (en) * 2015-12-07 2017-06-14 Basemark Oy An application latency determination method and system for wearable display devices

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US20110123062A1 (en) * 2009-11-24 2011-05-26 Mordehay Hilu Device, software application, system and method for proof of display
GB2583366B (en) * 2019-04-25 2023-05-24 Vojo Ip Ltd System and method of verifying display of visual information

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GB2383220A (en) * 2001-12-13 2003-06-18 Sony Uk Ltd Adaptive strength watermarking
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WO2005018233A1 (en) * 2003-08-18 2005-02-24 Softbank Corp. Content distribution system, content distribution method, content distribution server, content reproduction apparatus, content distribution program, and content reproduction program

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GB2383220A (en) * 2001-12-13 2003-06-18 Sony Uk Ltd Adaptive strength watermarking
WO2004109578A1 (en) * 2003-06-04 2004-12-16 Kordex, Inc. Apparatus for displaying local advertising to a display screen
WO2005018233A1 (en) * 2003-08-18 2005-02-24 Softbank Corp. Content distribution system, content distribution method, content distribution server, content reproduction apparatus, content distribution program, and content reproduction program

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2200334A1 (en) 2008-12-18 2010-06-23 Thomson Licensing Display device with feedback elements and method for monitoring
WO2014091505A1 (en) 2012-12-11 2014-06-19 Taggalo, S.R.L. Method and system for monitoring the displaying of video contents
US9846562B2 (en) 2012-12-11 2017-12-19 Taggalo, S.R.L. Method and system for monitoring the displaying of video contents
CN104348782A (en) * 2013-07-29 2015-02-11 樊小琴 Method ensuring correct playing of multimedia and device thereof
EP3179369A1 (en) * 2015-12-07 2017-06-14 Basemark Oy An application latency determination method and system for wearable display devices
US9697800B2 (en) 2015-12-07 2017-07-04 Basemark Oy Application latency determination method and system for wearable display devices

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GB2429357A (en) 2007-02-21
GB0607403D0 (en) 2006-05-24
WO2006123089A3 (en) 2007-01-25
GB0507348D0 (en) 2005-05-18

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