EP0028933A2
Expired / Lapsed
EP
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Surveillance system
Assignee: Ascotts Ltd
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Filing: 1980-11-10
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Granted: —
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Expires: 2000-11-10
Abstract
Abstract A surveillance system for detecting intruders in a protected area or property comprises unmanned closed circuit television apparatus inside the area or property with a transmitter (5) for transmitting video signals via a signal link to a mobile unit (9,10,11,12) positioned temporarily adjacent the area or property. The transmission of signals from the fixed apparatus can only be activated by a coded access signal fed via the link from a store (11) in the mobile unit to a control unit (6) in the fixed apparatus. A recording device or store (4) records signals from cameras (1) when triggered by a movement detector (2) or other sensors (7). The mobile unit includes means for causing recorded video signals in the store (4) to be transmitted via the link to the display unit (10).
Inventors
- 👤 Barry Leonard Wiseman
- 👤 Christopher David Gate
- 👤 Edward Collier Thomson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 09:43
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/194; G08B13/196; G08B13/19695; G07; G07C; G07C1/00; G07C1/20; G08B13/19639; G08B13/19645; G08B13/19654; G08B13/1966
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A method of monitoring a protected property wherein an electrical, electromagnetic or sonic link is temporarily established between fixed closed circuit television apparatus inside the property and a mobile monitoring unit outside the property, and wherein signals from the fixed apparatus are automatically transmitted via the link to the mobile unit only after a predetermined coded access signal has been fed to the system by the mobile unit.
Claim 2
Independent Claim
68 words
A method of monitoring a protected property wherein an electrical, electromagnetic or sonic link is temporarily established between fixed closed circuit television apparatus inside the property and a mobile monitoring unit outside the property, and wherein signals from the fixed apparatus are automatically transmitted via the link to the mobile unit only after a predetermined coded access signal has been fed to the system by the mobile unit.
Claim 3
Dependent Claim
39 words
A method according to claim 1 including feeding an activating signal via the link to the fixed apparatus to activate automatically the transmission of recorded video signals from a recording device in the fixed apparatus to the mobile unit.
Claim 4
Dependent Claim
35 words
A method according to claim 1 or claim 2 further including the step of causing a record of a monitoring operation carried out by the mobile unit automatically to be stored in the fixed apparatus.
Claim 5
Dependent Claim
153 words
A closed circuit television surveillance system comprising fixed apparatus associated with a protected area or property to be monitored, which apparatus comprises, inside the area or property, a plurality of television cameras, a switching unit operable to select an output signal from any one of the cameras, means for transmitting the output signal of a selected camera via a temporary signal link to a location outside the monitored area or property, and-a control unit operable to receive an access signal including a predetermined access code, and to cause the output signal to be transmitted automatically by the transmitting means in response to the access signal; and a mobile monitoring unit outside the monitored area or property having means for feeding the access signal into the fixed apparatus, and a display unit operable to receive the said output signal from the transmitting means when the access signal has been fed to the control unit.
Claim 6
Dependent Claim
153 words
A closed circuit television surveillance system comprising fixed apparatus associated with a protected area or property to be monitored, which apparatus comprises, inside the area or property, a plurality of television cameras, a switching unit operable to select an output signal from any one of the cameras, means for transmitting the output signal of a selected camera via a temporary signal link to a location outside the monitored area or property, and-a control unit operable to receive an access signal including a predetermined access code, and to cause the output signal to be transmitted automatically by the transmitting means in response to the access signal; and a mobile monitoring unit outside the monitored area or property having means for feeding the access signal into the fixed apparatus, and a display unit operable to receive the said output signal from the transmitting means when the access signal has been fed to the control unit.
Claim 7
Dependent Claim
74 words
A system according to claim 4 for detecting intruders in the protected area or property, wherein the fixed apparatus inside the area or property includes a recording device operable to record automatically video signals from the cameras, and means for causing the video signals stored by the recording device to be transmitted automatically by the transmitting means in response to a trigger signal fed to the control unit from outside the area or property.
Claim 8
Dependent Claim
33 words
A system according to claim 5 wherein the fixed apparatus includes a plurality of intruder censors operable to initiate recording of a video signal from one of the cameras by the recording device.
Claim 9
Dependent Claim
13 words
A system according to claim 6 wherein the sensors include a movement detector.
Claim 10
Independent Claim
28 words
A system according to any of claims 4 to 7, wherein the signal link comprises a two-way short-range radio link between <he fixed apparatus and the mobile unit.
Claim 11
Independent Claim
33 words
A system according to any of claims 4 to 7 wherein the signal link includes magnetic induction loop apparatus forming part of the fixed apparatus and located adjacent the protected area or property.
Claim 12
Independent Claim
35 words
A system according to any of claims 4 to 7, wherein the fixed apparatus includes a magnetic card reader positioned adjacent the protected area or property for feeding the access signal to the control unit.
References Cited (Backward Citations)
No citation records indexed.
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