GB2307322A - Security alarm method and device - Google Patents
Security alarm method and device Download PDFInfo
- Publication number
- GB2307322A GB2307322A GB9515890A GB9515890A GB2307322A GB 2307322 A GB2307322 A GB 2307322A GB 9515890 A GB9515890 A GB 9515890A GB 9515890 A GB9515890 A GB 9515890A GB 2307322 A GB2307322 A GB 2307322A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transmitter
- receiver
- unit
- security
- output signal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
- B60R25/102—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device a signal being sent to a remote location, e.g. a radio signal being transmitted to a police station, a security company or the owner
Abstract
The method comprises placing in a target to be protected a wireless transmitter 11 adapted to provide a wireless output signal at least when the transmitter is subject to motion or vibration and providing at a location remote from the transmitter a wireless receiver 12 for an output signal from the transmitter. Preferably the transmitter is adapted to provide a wireless output signal at least when the transmitter is subject to motion over a first frequency range and to vibration over a second frequency range. If necessary an intermediate transmission stage can be provided between the transmitter and the receiver so that the output signal from the transmitter serves to cause the intermediate stage to generate an intermediate output signal for reception by the receiver either directly or indirectly. The, or an, output signal from the transmitter may serve to initiate the operation of a transducer, e.g. an incapacitating device, adapted to provide an output signal or function independent of an output signal from the transmitter received either directly or indirectly by the receiver. The wireless transmitter unit includes a movement transducer 15 having a component which when subject to displacement relative to the rest of the transducer causes the transmitter to transmit a distinct output signal by way of an integral antenna.
Description
SECURITY MKHOD AND DEVICE
This invention relates to a security method and to a device for carrying out the method.
There is a widespread demand for effective security devices for use in relation to a target such as a vehicle which is necessarily left in a location where access to the target by an unauthorised person is possible. One class of security devices takes the form of mechanical units which when secured in place within or on a vehicle serve to prevent operation of a vehicle control. Such devices are simple and likely to deter a thief lacking incentive. A further class of devices for use with a target are sound and/or light alarms triggered on unauthorised entry or operation of the target. The resulting alarm is generated in the vicinity of the vehicle. This can cause annoyance to nearby people especially, as frequently occurs, the alarm is generated spuriously.
In such an event the alarm is likely to be ignored. In yet another security system means are provided on a vehicle enabling it to be tracked from a monitoring location.
However such a system involves the services of a monitoring organisation, extensive tracking resources making it expensive.
According to a first aspect of the present invention there is provided a security method for protecting a target comprising the steps of: 1 placing in the target a wireless transmitter adapted to provide a wireless
output signal at least when the transmitter is subject to motion or to vibration; 2 providing at a location remote from the transmitter a wireless receiver for an
output signal from the transmitter: and 3 interrogating by means of the receiver, at least periodically, for a an output
signal from the transmitter either directly or indirectly.
According to a first preferred version of the first aspect of the present invention the transmitter is adapted to provide a wireless output signal at least when the transmitter is subject to motion over a first frequency range and to vibration over a second frequency range.
According to a second preferred version of the first aspect of the present invention or of the first preferred version thereof there is provided an intermediate transmission stage between the transmitter and the receiver so that the output signal from the transmitter serves to cause the intermediate stage to generate an intermediate output signal for reception by the receiver either directly or indirectly.
According to a third preferred version of the first aspect of the present invention or any preceding preferred version thereof the, or an, output signal from the transmitter serves to initiate operation of a transducer adapted to provide an output signal or function independent of an output signal from the transmitter received directly orindirectly by the receiver.
According to a second aspect of the present invention there is provided a security device comprising: 1 a wireless transmitter unit including an movement transducer having a
component which when subject to displacement relative to the rest of the
transducer causes the transmitter to transmit a distinctive output signal by
way of an integral antenna; 2 a wireless receiver unit including:
a) an aerial circuit adapted to receive the distinctive output signal either
directly or indirectly; and
b) an output means adopted to provide a local output from the receiver in
the event of the aerial circuit receiving the distinctive signal.
According to a first preferred version of the second aspect of the present invention the device includes a transmitter with a transducer means adapted to cause the transmitter to provide a wireless output signal at least when the transmitter is subject to motion lying in a first frequency range and/or to vibration lying in a second frequency range.
According to a second preferred version of the second aspect of the present invention or of the first preferred version thereof the transmitter unit and the receiver unit are adapted for use in either a quiescent mode or in a working mode. Typically in the quiescent mode the receiver unit is juxtaposed with the transmitter unit to provide a single compact assembly; and wherein for use in the working mode the juxtaposed units are separated to provide for the transmitter unit to be located in or with a target and for the receiver unit to be retained by a user who remains in a given range of the target.
According to a third preferred version of the second aspect of the present invention the movement transducer comprises a bi-morph or other piezo electric device.
Typically one or more movement transducer can be provided to enable the device to respond to a frequency of movement lying in a first frequency range and to a frequency of vibration lying in a second frequency range.
According to a fourth preferred version of the second aspect of the present invention the transmitter comprises:
the movement transducer;
an encoder stage adapted to receive the output of the transducer and provide
as output a serial data stream;
a radio frequency transmitter stage adapted to broadcast the serial data stream
or a function thereof; and
a control input unit, such as a switch, for user input.
According to a fifth preferred version of the second aspect of the present invention the receiver comprises:
a radio frequency receiver stage adapted to convert broadcast dat from the
transmitter into a serial data stream;
a decoder stage adapted to translate the serial data stream into at least one
control signal; and
a control stage adapted to receive the or each control signal.
According to a sixth preferred version of the second aspect of the present invention the radio transmitter operates with FM transmission.
According to a third aspect of the present invention there is provided a security installation comprising at least one security device according to the second aspect or any preferred version thereof.
According to a preferred version of the third aspect of the present invention there is provided an intermediate transmitter/receiver unit enabling an output signal from the transmitter to cause the intermediate unit to generate an intermediate output signal for reception by the receiver.
As a broad concept the present invention is intended to provide a self contained movement sensing unit which provides a self contained transmitter and receiver unit which are conveniently coupled together when not in use and are readily separated to provide a transmitter for mounting in the target and a receiver for retention by the user. The unit which can be used to provide a security device for use in connection with a wide range of target articles liable to theft or unauthorised use. It is particularly, but not exclusively, applicable to vehicles (such as motor cycles, cars, lorries, or marine craft). It is also readily used for monitoring articles such as golf clubs; computer and computer related equipment; audio, video or television equipment; and jewellery.The transmitter unit for location on or in the target would normally be provided as a device of small size (comparable with an audio cassette if not smaller). It can be packaged in a variety of ways so that its purpose is not immediately obvious even to an observer who may be aware of the possibility of the target being equipped with a security device or system.
An exemplary embodiment of the invention will now be described with reference to the accompanying drawings relating to a security device for a motor vehicle of which:
Figure 1 is a perspective view of the device in a quiescent mode;
Figure 2 is a pictorial view of a the device in a working mode;
Figure 3 is a circuit diagram of a parts of the device; and
Figure 4 is a diagram of a typical message format transmitted between the main parts of the device.
Figures 1 shows a security device 10 made up of a battery powered FM transmitter unit 11 and a receiver unit 12 which in this cases are stacked together in a quiescent mode. Both units 11, 12 are relatively small as will be referred to later in connection with Figure 3. In this stacked alignment shown in Figure 1 the units 11, 12 can readily remain for extended periods without significant battery drain.
Figure 2 shows the units 11, 12 in use. User 13 of vehicle 14 prior to leaving the vehicle takes up the stacked units 11, 12 and separates them resulting in the transmitter unit 11 being automatically switched on. If necessary at or soon after the units being switched on the transmitter can transmit a test message to enable the receiver to store the identity of the transmitter so that in the event of further transmissions the receiver is programmed to identify its associated transmitter.
The transmitter unit 11 is placed in a selected location in the car 14. It has an appearance that will not readily reveal its function to a hostile observer. Typically the transmitter 11 can be packaged to appear as a book, or a sound cassette. The transmitter does not require an aerial extending outside the remainder of the unit (so tending to reveal its function) but is provide with a loop aerial extending near to but lying entirely within a face of the transmitter. The user 13 then leaves the vehicle 14 taking with them the receiver unit 12 with aerial 12A extended. Typically the user 13 is moving around or is stopping for longer or shorter periods in the locality.He can program the receiver 12 so that it is either switched on permanently or is periodically activated it so that any distinct warning signal emitted by the transmitter unit 11 will be detected by means of the receiver 12 to enable the user 13 to decide on a course of action. This can include warning police of the car 11 being the subject of attempted entry or actual entry by an unauthorised person.
Figure 3 is a block diagram of the stages in the transmitter 11 and receiver 12.
A movement detector 15 is made up of a piezo electric device 16 (sometimes referred to as a bi-morph device) incorporated in a transducer 17. The transducer 17 serves to convert mechanical or acoustic energy applied to the member 16 into an electrical energy output. When the member 16 is stressed or subjected to vibration layers of material in the member 16 are alternately subject to tension and compression. As the adjacent layers of the piezo ceramic material are polarised in opposite directions the stressing of the member 16as a whole results in the generation of an electrical output.
This output serves as a motion signal M which is fed to a micro controller stage 18.
This stage serves to convert the analogue signal M into a serial data stream signal 19 subsequently fed as input to an FM transmitter made up of a low pass filter stage 20, a modulator 21, oscillator 22 and a band pass filter 23 whose output is transmitted as an FM transmission X from integral aerial 24. The range of the transmission is intended to be limited say to about 300 metres in an urban environment so the power output of the transmitter can be kept low. A suitable operating frequency would be about 418 MHz.
If necessary the transmitter can incorporate more than one transducer so that the transmitter senses motion of the transmitter if physically raised and then put down gently and in addition will sense vibration fed into the transmitter from some other part of the vehicle by way of the vehicle structure. Typically such vibration can arise from the vehicle engine being started.To this end a piezo electric device makes a particularly effective sensor
The transmission signal X is represented in Figure 4 and takes the form of a four section message comprising:
a header 41 incorporating an identifying code for the device;
an identifier 42 containing the unique code for the particular transmitter unit
11;
a control 43 identifying the function information of the transmission (eg alarm
signal corresponding to 'movement detected' or an 'OK' signal); and
a check sum or other integrity verifier 44
Typically the header 41 will require at least 8 bits, the identifier 42 16 bits and the control 43 and check an 8 bit field each. The transmission signal X is provided with a format so that in an environment likely to include electromagnetic noise varying widely in frequency and amplitude the signal X will nevertheless only cause a matching receiver to be energised.This could be particularly significant in an environment where a number of similar security devices are in use.
The receiver unit 12 has an antenna 25 feeding FM receiver stages comprising a radio frequency preamplifier 26 and oscillator stage 27 matched with output from an oscillator 28. Radio frequency output 29 is fed by way of low pass filter stage 30 to an audio frequency amplifier 31 and a comparator 32 whose output is in turn fed to a control stage made up of a micro controller 33 and an output indicator 34 incorporating an audio signal generator and an LED display.
When not in use the transmitter unit 11 has the receiver unit 12 plugged into it so as to provide a compact quiescent unit 10 which is readily set up, stored or carried and used by a user. The battery drain from the quiescent unit 10 is negligible if not virtually non-existent. The device 10 described provides a compact and robust device which is portable and readily put into a working condition without needing functional knowledge or manipulative skills.
The transmitter 11 can, if necessary, incorporate one or algorithms so that the transmitter output can to an extent be self checking so as to minimise spurious signal transmission. Typically if the transmitter incorporates more than one movement transducer the algorithm can incorporate checks for each type of movement or vibration detected. The transmitter 11 can be readily adapted to provide a distinctive and unique signal so that a number of such devices can be used in the same area without interacting with one another.
The example is described is in connection with the security of a motor vehicle.
However the small size of the unit makes it applicable to any object whose location should not vary from that established by the owner or user. Typically the transmitter could be inserted in a bag or other luggage involving valuable or significant items.
The example describes a transmitter that triggers a receiver which directly informs the user of target movement. In an alternative embodiment the transmitter can be linked to the user by an intermediate stage whereby a signal from the transmitter is received by an intermediate transmitter/receiver unit so that an output from the target transmitter is received by the intermediate unit which in turn transmits a further signal to the users receiver. Such an intermediate system could be used in a multistorey car park for an office or hotel.
In yet another embodiment the transmitter in the target vehicle can alternatively or additionally serve to trigger a transducer which serves to provide a further or different type of signal or output. Typically such a transducer could generate a signal or provide a locking or incapacitating operation on the target using an independent power source. The use of such a transducer in addition to a receiver for informing the user could serve to distract an unauthorised user of the target from the existence of the transmitter unit. Typically such a transducer could serve to switch to a wider range signalling unit in the event the target is subject to substantial displacement before the user can initiate recovery action.
The invention lends itself to a range of applications depending on the target involved and amount of information to conveyed to the receiver either directly or indirectly from the transmitter.
Claims (18)
1 a wireless transmitter unit including an movement transducer having a
component which when subject to displacement relative to the rest of
the transducer causes the transmitter to transmit a distinctive output
signal by way of an integral antenna;
2 a wireless receiver unit including
a) an aerial circuit adapted to receive the distinctive output signal
either directly or indirectly; and
b) an output means adopted to provide a local output from the
receiver in the event of the aerial circuit receiving the distinctive
signal.
6 A security device as claimed in Claim 5 wherein the transmitter includes
transducer means adapted to cause the transmitter to provide a wireless
output signal at least when the transmitter is subject to motion lying in a first
frequency range and/or to vibration lying in a second frequency range.
7 A security device as claimed in Claim 5 or Claim 6 wherein the transmitter
unit and the receiver unit are adapted for use in either a quiescent mode or in
a working mode.
8 A security device as claimed in Claim 7 wherein in the quiescent mode the
receiver unit is juxtaposed with the transmitter unit to provide a single
compact assembly; and wherein for use in the working mode the juxtaposed
units are separated to provide for the transmitter unit to be located in or with
a target and for the receiver unit to be retained by a user who remains in a
given range of the target.
9 A security device as claimed in Claim 5, 6, 7 or 8 wherein the movement
transducer comprises a bi-morph or other piezo electric device.
8 A security devices as claimed in any one of Claims 5 to 9 wherein the
transmitter comprises:
the movement transducer;
an encoder stage adapted to receive the output of the transducer and provide
as output a serial data stream;
a radio frequency transmitter stage adapted to broadcast the serial data stream
or a function thereof; and
a control input unit, such as a switch, for user input.
10 A security device as claimed in any one of preceding claims Claim 5 to 9
wherein the receiver comprises:
a radio frequency receiver stage adapted to convert broadcast dat from the
transmitter into a serial data stream;
a decoder stage adapted to translate the serial data stream into at least one
control signal; and
a control stage adapted to receive the or each control signal.
11 A security device as claimed in any of preceding claims 5 to 10 wherein the
radio transmitter operates with FM transmission.
12 A security device as hereinbefore described with reference to the
accompanying drawings.
13 A security installation comprising at least one security device as claimed in
any of preceding claims 5 to 12.
14 A security installation as claimed in Claim 13 characterised by an intermediate
transmitter/receiver unit enabling an output signal from the transmitter to
cause the intermediate unit to generate an intermediate output signal for
reception by the receiver.
Amendments to the claims have been filed as follows 1 A security device comprising a wireless transmitter unit including a movement
transducer which when the unit is subject to displacement by novement or
vibration provides for the emission from the transmitter unit of a
predetermined signal by way of an antenna; and a wireless receive er unit adapted to receive the predetermined signal by way of an integral @l antenna and including an output means adapted to provide an output siZ al from the
receiver in the event of the receiver unit detecting the predetermined signal;
characterised in that the transmitter unit is contained in a housing adapted to
be free standing and serving to conceal the contents of the housing; the
transmitter unit including- a wireless transmitting means, an antenna, the
movement transducer, control means providing for periodic rather than
continuous transmission of the predetermined signal from the transmitting
means on the transducer being subject to displacement by move ement or
vibration; and a storage location for a battery.
2 A security device as claimed in Claim 1 characterised in that the transducer serves to initiate the transmission of the predetermined signal hen the
transducer is subject to motion lying in a first frequency range and/or to
vibration lying in a second frequency range.
3 A security device as claimed in Claim I or Claim 2 characterised in that the transducer has a movement sensing member composed of a a@ bi-morph or other piezo electric device.
4 A security device as claimed in any preceding claim characterised by the
transmitter unit and the receiver unit are adapted for use in combination in a
quiescent mode and when separated in a working mode.
5 A security device as claimed in Claim 4 characterised in that in the quiescent
mode the receiver unit is coupled to the transmitter unit to provide a single
compact assembly and the working mode is established from the quiescent
mode by separating the receiver from the transmitter to enable the transmitter
to be located in or by means of the target; the receiver unit being retained by a
user when remote from the target.
6 A security device as claimed in any preceding claim characterised in that the
transmitter includes: an encoder stage adapted to receive the output of the
transducer and to provide as output a serial data stream; tle transmitter being
adapted to broadcast the predetermined signal in the form C) a serial data
stream transmission.
7 A security device as claimed in any preceding claim characterised in that the
receiver includes: a radio frequency receiver stage adapted to i invert a
broadcast data stream from the transmitter into a serial data st@@am; An
encoder stage adapted to translate the serial data stream into at at least one
control signal; and a control stage adapted to receive the or each control
signal.
8 A security device as claimed in any preceding claim characterised in that the
radio transmitter and receiver units communicate by FM transmission.
9 A method of security protection for a target wherein a wireless @ ransmitter
unit is incorporated in, or located by, the target, the transmitte @ unit
incorporating a movement detector which on being subject t) @@vement provides an output to activate a wireless transmitter to trallsn) i
predetermined signal; and at a location remote from the unit a @ireless receiver is adapted to detect the predetermined wireless signal from the
transmitter and thereafter generating by way of the receiver n warning signal characterised in that the wireless transmitter is a free stand f if powered unit and in the event the movement detector is subjected to movement and/or
vibration the movement detector is caused to the output so as l(l cause the
transmitter to periodically transmit the predetermined signal IO; detection,
directly or indirectly, by the receiver; and the receiver is adap (i by way of an
internally powered source to periodically monitor for the predetermined
signal.
10 A security method as claimed in Claim 9 characterised in that the movement
detector is adapted to provides the output when subject to novement over a
first frequency range and/or to vibration over a second frequen@@ range.
11 A security method as claimed in Claim 9 or Claim 10 charactemsed by the
provision of an intermediate transmission/receiver stage between the
transmitter unit and the receiver so that the emission of the predetermined
signal by the transmitter unit causes the intermediate stage tt generate an
output for reception by the receiver so providing for indire@t reception of the
receiver of the predetermined signal.
12 A security method as claimed in any Claim 9, Claim 11) Or Claim 11 characterised in that the predetermined signal or a further signal from the unit
serves to initiate operation of a transducer adapted to prov@de : output signal
or function independently of the predetermined signal.
13 A security method as claimed in Claim 12 characterised in will the further
signal serves to initiate a security, warning or disabling fUlIQiIii or the
protection of the target.
14 A security installation characterised by a target having it least !C security
device as claimed in any of preceding Claims 1 to 8.
15 A security installation as claimed in Claim 14 characterised i;i that the target
is a motor vehicle and the transducer is adapted to detect movement/vibration
characteristic of those generated by operation of a prinle move@ of the vehicle.
16 A security installation as claimed in Claim 14 or 15 characterise @ by the
provision of a first region in which the target is located, a second region in
which the receiver is located and a location intermediate the first and second
regions.
17 A vehicle protected by a security method as claimed in one of Claims 9 to 13.
18 A security device as hereinbefore described with reference t@ accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9515890A GB2307322A (en) | 1995-08-03 | 1995-08-03 | Security alarm method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9515890A GB2307322A (en) | 1995-08-03 | 1995-08-03 | Security alarm method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9515890D0 GB9515890D0 (en) | 1995-10-04 |
| GB2307322A true GB2307322A (en) | 1997-05-21 |
Family
ID=10778680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9515890A Withdrawn GB2307322A (en) | 1995-08-03 | 1995-08-03 | Security alarm method and device |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2307322A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000038124A1 (en) * | 1998-12-22 | 2000-06-29 | Gateway, Inc. | Event notification within a local system |
| GB2373086A (en) * | 2001-03-05 | 2002-09-11 | Dennis Huang | An motion/vibration sensing alarm comprising a transmitter and receiver |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3988724A (en) * | 1975-07-17 | 1976-10-26 | David John Anderson | Theft alarm |
| US4187497A (en) * | 1978-03-22 | 1980-02-05 | Harless Orville F | Portable vehicle alarm system |
| US4218763A (en) * | 1978-08-04 | 1980-08-19 | Brailsford Lawrence J | Electronic alarm signaling system |
| US4267547A (en) * | 1978-03-14 | 1981-05-12 | Dentan Co., Ltd. | Theft prevention apparatus for vehicles |
| GB2217494A (en) * | 1988-04-13 | 1989-10-25 | John Chilton | Intruder alarm system |
| EP0380075A1 (en) * | 1989-01-24 | 1990-08-01 | Fujitsu Limited | Radio automatic alarm transfer system |
| GB2246892A (en) * | 1990-06-12 | 1992-02-12 | Nicholas Craig Nutter | Theft detection |
-
1995
- 1995-08-03 GB GB9515890A patent/GB2307322A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3988724A (en) * | 1975-07-17 | 1976-10-26 | David John Anderson | Theft alarm |
| US4267547A (en) * | 1978-03-14 | 1981-05-12 | Dentan Co., Ltd. | Theft prevention apparatus for vehicles |
| US4187497A (en) * | 1978-03-22 | 1980-02-05 | Harless Orville F | Portable vehicle alarm system |
| US4218763A (en) * | 1978-08-04 | 1980-08-19 | Brailsford Lawrence J | Electronic alarm signaling system |
| GB2217494A (en) * | 1988-04-13 | 1989-10-25 | John Chilton | Intruder alarm system |
| EP0380075A1 (en) * | 1989-01-24 | 1990-08-01 | Fujitsu Limited | Radio automatic alarm transfer system |
| GB2246892A (en) * | 1990-06-12 | 1992-02-12 | Nicholas Craig Nutter | Theft detection |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000038124A1 (en) * | 1998-12-22 | 2000-06-29 | Gateway, Inc. | Event notification within a local system |
| GB2373086A (en) * | 2001-03-05 | 2002-09-11 | Dennis Huang | An motion/vibration sensing alarm comprising a transmitter and receiver |
| GB2373086B (en) * | 2001-03-05 | 2004-12-15 | Dennis Huang | Vibration-sensing alarm device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9515890D0 (en) | 1995-10-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |