WO1991017532A1 - Ameliorations relatives a un systeme de surveillance - Google Patents

Ameliorations relatives a un systeme de surveillance Download PDF

Info

Publication number
WO1991017532A1
WO1991017532A1 PCT/GB1991/000738 GB9100738W WO9117532A1 WO 1991017532 A1 WO1991017532 A1 WO 1991017532A1 GB 9100738 W GB9100738 W GB 9100738W WO 9117532 A1 WO9117532 A1 WO 9117532A1
Authority
WO
WIPO (PCT)
Prior art keywords
surveillance system
carriage
track
signal
detection means
Prior art date
Application number
PCT/GB1991/000738
Other languages
English (en)
Inventor
Dennis Weston
Original Assignee
DIXEY, Terence, Gray
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 DIXEY, Terence, Gray filed Critical DIXEY, Terence, Gray
Publication of WO1991017532A1 publication Critical patent/WO1991017532A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19617—Surveillance camera constructional details
    • G08B13/19623—Arrangements allowing camera linear motion, e.g. camera moving along a rail cable or track
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras
    • G08B13/19695—Arrangements wherein non-video detectors start video recording or forwarding but do not generate an alarm themselves

Definitions

  • the present invention relates to surveillance systems and more particularly to systems of the type comprising cameras carried along hidden tracks for use in public buildings.
  • the signal from the camera is transmitted to an imaging means such as a video display unit along cable which means that if the cable is damaged and broken it is often difficult to locate the precise position of the fault in order to repair or replace a section of the cable.
  • the invention provides a means of transmitting a video signal which overcomes the aforementioned restrictions.
  • a surveillance system comprising a carriage means adapted to travel along a track, the carriage supporting a detection means for producing a signal transmittable to a remote receiving station wherein the track along which the carriage travels serves as a transmission line for the signal.
  • the track is adapted for optimum transmission of the video signal.
  • the track is made of copper.
  • the detection means is a camera.
  • the signal is a video signal.
  • a coupling network is provided to enable the signal to be transferred and transmitted along the track.
  • the carriage is provided with coupling means in the form of carbon brushes or the like which conduct signals travelling along the track and so transfer the said signals from the track to a predetermined location.
  • coupling means in the form of carbon brushes or the like which conduct signals travelling along the track and so transfer the said signals from the track to a predetermined location.
  • the carriage is powered by an electric motor and more preferably the energy to power the electric motor is transmitted along the track.
  • the camera located on the carriage is controlled by a remote operating means.
  • control signals from the remote operating means are transmitted to the camera via the track.
  • the carriage is provided with at least one light sensor so as to detect when the carriage is travelling through a tunnel, passage or the like.
  • the at least one light sensor is coupled to a means for rotating the camera so that when the carriage travels through the said tunnel the camera can be rotated so as to view a preselected area when the carriage emerges from the said tunnel.
  • the carriage is provided with braking means which are adapted to decellerate the carriage as it approaches the end of a straight run of track.
  • the braking means comprises a light sensing means located on the carriage and a light reflecting means located on or towards the end of a straight run of the track so that as the carriage approaches the light reflecting means, the light sensing means is activated and a braking means is in turn activated.
  • a surveillance system comprising a carriage means supporting a detection means, and a track along which the carriage travels wherein the track is adapted to transmit a plurality of signals so as to: control the movement of the carriage on the track, control the operational status of the detection means on the carriage and to transmit a signal from the detection means to a remote receiving station.
  • a surveillance system comprising a carriage means supporting a detection means, the carriage being adapted to travel along a predetermined track whereby the carriage is able to follow a circuitous route.
  • the detection means comprises at least one camera.
  • a plurality of carriages will be coupled so as to travel in numbers around the track.
  • each of said coupled carriages will perform a different funtion.
  • the carriage and track is concealed within a housing, the housing being provided with at least one face comprising preferably a one-way mirror.
  • the carriage is further provided with heat sensing means so as to detect the presence of an individual in an environment or to detect the presence of fire.
  • the carriage is further provided with a smoke sensing means.
  • Figure 1 is a plan view of a surveillance system according to the invention.
  • Figure 2 is a side view of a carriage carrying a camera
  • Figure 3 is a front view of the carriage shown of Figure 2 and
  • FIGS 4 and 5 show diagrammatically the signal transmission scheme employed in the invention.
  • the surveillance system of the present invention comprises a duct 10 which may run for example around the whole perimeter of a supermarket, factory, warehouse, football stadium or the like. It is of note that the duct is not straight but has bends or curves 12.
  • the duct is formed from a rigid material such as steel and has a window 14 on a first side A of the duct 10.
  • Window 14 runs along the entire length of the duct and is inset into front wall 16.
  • Window 14 is formed from one-way glass or a similar material so that an observer cannot see inside duct 10 but a viewing means located inside the duct can view the environment through window 14.
  • a carriage 18 Positioned within the duct 10 is a carriage 18 on which is mounted camera 20.
  • Each carriage 18 may carry more than one camera 20 in order to obtain a better view of any situation.
  • the cameras are orientated so that they survey the environment surrounding the duct 10 through window 14.
  • Carriages 18 are further provided with an electric motor 22 for powering same. Electricity is supplied to the motors 22 by means of conducting rails or track 24. Rails 24 are evenly spaced along their length and run the entire length of duct 10.
  • a first carriage 18 is provided with depending carbon brushes 26 at its front end X. Brushes 26 form an electrical contact with track 24. This is also seen in Figure 3.
  • Carriage 18 is further provided with a single wheel 28 which lies between brushes 26 at the front end of the carriage.
  • the carriage 18 may also be provided with additional pairs of brushes 30 along its length to ensure that electrical contact with rails 24 is constantly maintained.
  • Carriage 18 is also provided with additional stabilising wheels 52.
  • Carriage 18 may further be coupled to a second carriage 19 by means of coupler 42.
  • Carriage 19 is also provided with a camera 20 but may or may not be provided with a motor 22.
  • This coupled arrangement has the advantage that two different views may be obtained of the same incident since cameras 20 are in slightly different positions. Alternatively, one of the cameras could be used to take a long distance shot while the other could be zoomed in order to record details.
  • Cameras 20 are provided with zoom tilting and panning facilities in order to enhance the functioning of the surveillance systems.
  • an operator at a remote controll centre can select a location in which he wishes a camera to be positioned and can transmit to the carriage 18 an instruction to move to that location.
  • camera 20 on carriage 18 can be operated to show a picture of the areas surrounding the camera.
  • the operator can select the type of operation required and transmit the necessary instructions to each of the cameras 20.
  • Information from the camera is transmitted to the remote control centre via the track which functions as a transmission line.
  • a remote control station 50 is provided with an operating means for controlling the operational status of a camera 20 located on a remote carriage 18. As illustrated in Figure 4 camera 20 may be controlled so as to enable panning, tilting, focusing or zoom to be controlled. Further, there is provided a driving means for controlling the motion of carriage 18 and also any other means which are considered to be suitable for operation of the surveillance system.
  • An operating device such as a push button or joy stick is connected to an Interface and Channel Multiplexer so that operation of a pre-selected operating device is detected by the Multiplexer and a suitable pulse signal is generated. It will be understood that the nature of the signal generated will be determined by the nature of the operation to be performed.
  • the signal generated by the multiplexer modulates a carrier signal of 42 MHz supplied by oscillator 4.
  • the form of modulation used is either pulse width or frequency modulation or frequency shift keying or any other suitable means known to those skilled in the art.
  • a filter 5 is used to eliminate unwanted signals before the pulse signal is transmitted to a coupling network 6.
  • the coupling network 6 connects the signal onto the track 24 for transmission along the track and the impedance of the track 24 is matched by the coupling network so as to avoid losses or reflections which result in standing waves forming on the line.
  • a second coupling network 8 which picks up the transmitted signal via carbon brushes 26 depending from carriage 18.
  • the signal is passed through a suitable demodulating circuit to recover the original information; the demodulating circuit comprising a local oscillator 11 and a demodulator 12 and filter 13 for elimination on unwanted radio frequencies.
  • the demodulated signal then passes to a Channel Demultiplexer 14 where the signal is converted from a pulse signal to a voltage signal and so exists in exactly the same state as it was generated by the Mulitiplexer 2.
  • the Channel Demultiplexer 14 feeds the signal for example to a circuit controlling operation of camera pan and so brings about panning of the camera.
  • controlling signals having a predetermined pulse signature are similarly transmitted along the track 24 in order to bring about a predetermined result in the operational status of the camera.
  • signals for driving the motor 22 attached to carriage 18 are also transmitted via track 24 following passage through coupling network 6. This signal activates the motor 22 and power for operation of the motor 22 is derived via a 24 volts supply provided in track 24.
  • camera 22 (not shown) provides a video input signal which may be either colour or black and white as indicated at 20.
  • the video signal is modulated on a carrier frequency of 192 MHz. This is brought about by means of circuitry indicated by references 22 and 24.
  • Filter 42 is provided to eliminate unwanted signals.
  • the modulated signal is fed to a coupling network 8 and transmitted along track 24 via carbon brushes 26 depending from carriage 18.
  • coupling network 6 picks up the modulated video signal and transfers it to the demodulating circuit shown in Figure 4 which comprises filter 30 to eliminate unwanted frequencies, and local oscillator 32 and phase locked loop 34.
  • Oscillator 32 and phase locked loop 34 are used in conventional manner to demodulate the signal in order to reconstitute the video signal.
  • the demodulated signal appears at 35 before a final amplification and filtering step at 36.
  • the video output signal 38 is equal to the video input signal 20.
  • the video output signal is now fed to a monitor for viewing.
  • carriage 18 may also be provided with heat sensors and smoke sensors which may also be controlled so as to selective orientate with respect to the carriage so as to efficiently scan a predetermined area.
  • the signals for controlling the sensors and relaying information are transmitted in the afore described fashion.
  • the carriage will be provided with a light sensing means and the inside of a housing in which the surveillance system is located is provided with light reflecting means positioned at predetermined locations so that as the carriage approaches a passage or tunnel or the like the light sensing means will detect light from the light reflecting means and a signal can be sent to the detection means so that it may be orientated accordingly during the time that the carriage is in the tunnel and also for when the carriage emerges from the tunnel.
  • a light sensing means is coupled to a braking means so that as the carriage approaches the end of a straight run of track light reflectors on the inside of the housing accommodating the surveillance system will signal the end of the run of track to the light sensing means which in turn will be coupled to a braking device so as to slow down the carriage.
  • the surveillance system therefore provides an efficient and flexible means of monitoring a public building.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Closed-Circuit Television Systems (AREA)

Abstract

Un système du surveillance utilisé dans un bâtiment public comprend un élément chariot destiné à se déplacer le long d'une piste, l'élément chariot étant pourvu d'un moyen de détection adapté pour surveiller les environs de la piste et produire des signaux de détection correspondants qui sont transmis à une station réceptrice à distance par l'intermédiaire de la piste sur laquelle se déplace le chariot. De cette façon, le chariot est capable de suivre un parcours sinueux, et la piste est capable d'émettre une multiplicité de signaux.
PCT/GB1991/000738 1990-05-09 1991-05-09 Ameliorations relatives a un systeme de surveillance WO1991017532A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9010348.2 1990-05-09
GB909010348A GB9010348D0 (en) 1990-05-09 1990-05-09 Improvements relating to surveillance systems

Publications (1)

Publication Number Publication Date
WO1991017532A1 true WO1991017532A1 (fr) 1991-11-14

Family

ID=10675667

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000738 WO1991017532A1 (fr) 1990-05-09 1991-05-09 Ameliorations relatives a un systeme de surveillance

Country Status (3)

Country Link
EP (1) EP0541555A1 (fr)
GB (1) GB9010348D0 (fr)
WO (1) WO1991017532A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2253534A (en) * 1991-02-02 1992-09-09 Advanced Technology Ind Limite A remote camera monitoring system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573894A1 (fr) * 1984-11-28 1986-05-30 Groupe Telephone Biens Equipem Dispositif de surveillance antivol
DE3740684A1 (de) * 1987-12-01 1989-06-15 Woehr Otto Gmbh Parksystem
FR2633134A1 (fr) * 1988-06-15 1989-12-22 Boucher Bernard Installation de surveillance video
EP0364921A1 (fr) * 1988-10-17 1990-04-25 Compagnie Generale D'automatisme Cga-Hbs Tube guide pour capteur mobile de surveillance

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573894A1 (fr) * 1984-11-28 1986-05-30 Groupe Telephone Biens Equipem Dispositif de surveillance antivol
DE3740684A1 (de) * 1987-12-01 1989-06-15 Woehr Otto Gmbh Parksystem
FR2633134A1 (fr) * 1988-06-15 1989-12-22 Boucher Bernard Installation de surveillance video
EP0364921A1 (fr) * 1988-10-17 1990-04-25 Compagnie Generale D'automatisme Cga-Hbs Tube guide pour capteur mobile de surveillance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2253534A (en) * 1991-02-02 1992-09-09 Advanced Technology Ind Limite A remote camera monitoring system

Also Published As

Publication number Publication date
GB9010348D0 (en) 1990-06-27
EP0541555A1 (fr) 1993-05-19

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