US3573620A - Security system with inductive to rf communications links - Google Patents

Security system with inductive to rf communications links Download PDF

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Publication number
US3573620A
US3573620A US733693A US3573620DA US3573620A US 3573620 A US3573620 A US 3573620A US 733693 A US733693 A US 733693A US 3573620D A US3573620D A US 3573620DA US 3573620 A US3573620 A US 3573620A
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frequency
loop
receiving
location
guard
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US733693A
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John Raymond Ashley
Colin Grahame Douglas
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
    • G07C1/20—Checking timed patrols, e.g. of watchman

Definitions

  • a radio transmitter carried by a security guard or watchman includes a loop aerial and a loop demodulator, and loop carrier frequency generators each generating a loop carrier frequency modulated by a different modulating frequency are installed at different points to be visited by the guard, so that as the guard reaches each point the loop carrier is demodulated and the modulating frequency is used to modulate the transmitter carrier.
  • the transmitted signals are picked up at a distant monitoring point. demodulated, and the modulating frequency is identified with the point visited.
  • This invention relates in general to security systems, and more particularly to a system by which the movements of a watchman or security guard may be automatically indicated at a remote point on a monitoring system which may, for example, be located at the headquarters of a Security Service or in a Police Station.
  • the officer In order to protect property and maintain continual watch for the development of fires, it is quite usual to employ a night watchman or security guard whose duty it is to patrol the property or premises in question. To ensure that this officer carries out his duties correctly it is common practice to provide a number of check points all of which the officer is required to visit at predetermined intervals.
  • the officer In one system the officer is provided with a clock device into which he can insert any one of several keys mounted at discrete locations in the premises in order to record each visit to each location on a paper tape within the clock device.
  • the object of the invention is to provide a system by which it is possible to monitor at a remote location the movement of the officer so that if he fails to reach a particular check point at a particular time this fact is indicated at once.
  • the invention consists of a location system comprising a radio transmitter to be carried by a watchman or security guard, the radio transmitter including a loop aerial and a loop demodulator, a plurality of frequency generating means, hereinafter called loop carrier frequency generators each generating a loop carrier frequency and a location frequency by which the loop carrier frequency is modulated, the generators being located at selected points in the area to be patrolled by the watchman or security guard, each location frequency being different and being indicative of the location of the associated generator, means for installation at a monitoring point to receive the transmitted demodulated carrier wave including filters by which the particular location frequencies may be recognized, and means by which the receipt of each particular frequency is indicated.
  • a location system comprising a radio transmitter to be carried by a watchman or security guard, the radio transmitter including a loop aerial and a loop demodulator, a plurality of frequency generating means, hereinafter called loop carrier frequency generators each generating a loop carrier frequency and a location frequency by which the loop carrier frequency is modulated, the generators being located at
  • FIG. 1 shows the apparatus carried by the officer and two inductive loop frequency generators
  • FIG. 2 shows the apparatus at the receiving or monitoring point
  • FIG. 3 shows the panel of a suitable indicating device.
  • an ordinary mobile pocket radio transmitter (less microphone) indicated by a dotted rectangle 11.
  • the rectangle 11 contains a block representing the radio transmitter with a transmitting aerial 12a and having connected to it the transmitter modulator 13.
  • This mobile transmitter may be very small and may be a pocket V.H.F. transmitter of the kind carried by policemen who are on ordinary patrol duties covering different beats.
  • the officer carries further apparatus indicated by the block 14 together with a loop aerial 15 connected to the block 14 by means of a rod or cable.
  • the block 14 contains a loop detector and a loop demodulator.
  • each of these inductive loop frequency generators is arranged to generate a main or carrier frequency and a location frequency by which the carrier frequency is modulated.
  • the carrier frequencies are identical but each of the location frequencies is different so that the location of each particular loop frequency generator may be identified by the unique location frequency.
  • the loop aerial l5 carried by the officer is designed to receive the loop carrier frequency from each of the inductive loop frequency generators and this loop carrier is applied to the loop detector and demodulated by the loop demodulator contained in the block 14.
  • the modulation frequency which is, of course, the location frequency, is then applied to the modulator 13 in the officer's transmission equipment ll.
  • the transmitter transmits a continuous carrier frequency and each time he pases near one of the inductive loop frequency generators, as represented by 16 and 17, the particular location frequency is transmitted for a short period.
  • a monitoring apparatus consisting of a receiver 18 having a receiving aerial 18a and tuned to the particular carrier frequency which the radio transmitter carried by the ofiicer is transmitting.
  • the output of the receiver 18 is passed to a demodulator l9 and the demodulated output is passed through a series of filters 20 each one of which responds to one of the location frequencies.
  • the particular frequency is recognized by one of the filters and is caused to provide an indication of its presence, for example, by operating a relay which lights a lamp on an indicator 21.
  • FIG. 3 shows a suitable form of indicator 21 which may consist of a front panel 22 having 10 circular bezcls each of which contains aglass window 23, which may be colored if desired.
  • the 10 indicators are numbered and a lamp is provided behind each window. lt may be arranged that once one of the lamps behind a window 23 has been illuminated by the receipt of one location frequency it will remain illuminated until another location frequency is received, when the indicator corresponding to the location of the new frequency is illuminated and the previously illuminated indicator is extinguished. This mode of operation may conveniently be achieved by the use of relays.
  • the indicator shown in FIG. 3 in only exemplary and indicating means suitable for any desired number of different locations may easily be provided.
  • the system according to the invention offers many advantages. ln the first place it is possible continuously to monitor the movements of the officer. If he does not arrive at a particular place by a particular time then it is known that something is not as it should be, which may be due either to a failure of duty on the part of the officer or to some other cause. Not only does the invention make it possible to detect quickly the kind of condition which the officer is intended to detect, i.e., the presence of intruders or fire, but the monitoring system will also give an indication if the ofiicer should have an accident or be taken ill so that he is unable to continue his patrol.
  • a security system comprising signal receiving and transmitting means to be carried by a watchman or security guard, a plurality of inductive frequency generating means for generating a loop carrier frequency and a predetennined location frequency for modulating the loop frequency, said generating means being located at selected points in the area to be patrolled by the watchman or security guard.
  • said signal receiving and transmitting means comprising a loop aerial for receiving both the loop carrier frequency and the location frequency generated by said generating means as the said guard nears said generating means and a loop demodulator for demodulating the received signal, said signal receiving trans mitting means being adapted to transmit the said demodulated signal to a second receiving means for receiving said signal, said second receiving means including a plurality of filters by which the particular location frequencies may be recognized,

Abstract

In a location system a radio transmitter carried by a security guard or watchman includes a loop aerial and a loop demodulator, and loop carrier frequency generators each generating a loop carrier frequency modulated by a different modulating frequency are installed at different points to be visited by the guard, so that as the guard reaches each point the loop carrier is demodulated and the modulating frequency is used to modulate the transmitter carrier. The transmitted signals are picked up at a distant monitoring point, demodulated, and the modulating frequency is identified with the point visited.

Description

KR assumes inventors I AppLNo.
Filed Patented Priority SECURITY SYSTEM WITH INDUCTIVE TO RF COMMUNICATIONSLINKS 3Chims,3DrawingFigs.
usfl 325153,
men H04b 1/50,
FieldofSear-ch 325/4,7,
l6,5l,53,64, lll, 113,118; 340/224, 306, 152 (TR), 286, 287, 311, 312; 343/226 I F129 "'l RAD/O TPANSM/TTEP I I l I i l I g l 14 LOOP 057-5 DEMODULATOR MODULA 70R TATES PATENTS ker etal 325/51 d 340/312 hwitzgebel et a1 325/64 Primary Examiner--Robert L. Grifiin Assistant Examiner-James A. Brodsky Att0meysHarry C. Bierman, Jordan B. Bierman and Bierman and Bierman ABSTRACT: In a location system a radio transmitter carried by a security guard or watchman includes a loop aerial and a loop demodulator, and loop carrier frequency generators each generating a loop carrier frequency modulated by a different modulating frequency are installed at different points to be visited by the guard, so that as the guard reaches each point the loop carrier is demodulated and the modulating frequency is used to modulate the transmitter carrier. The transmitted signals are picked up at a distant monitoring point. demodulated, and the modulating frequency is identified with the point visited.
Patented April 6, 1971 3,573,620
RAD/O TRANSMITTER Irv-11 I I I 15 MODULATOR -4 14 r 1 LOOP DE 713 I 5 DEMODUZATOR :L 5
LOOP rpm! LOOP F 5 4 1.5 GENERATOR GENERATOR RECEIVER -0Mo0uLATO/?-' F11. TfRS INDICATOR J HN RAYMONDASHLET coun c-Mmne Downs mvawroas ATTORNE Y5 SECURXTY SYSTEM WITH INDUCTIVE T RF COMMUNICATIONS LINKS This invention relates in general to security systems, and more particularly to a system by which the movements of a watchman or security guard may be automatically indicated at a remote point on a monitoring system which may, for example, be located at the headquarters of a Security Service or in a Police Station.
In order to protect property and maintain continual watch for the development of fires, it is quite usual to employ a night watchman or security guard whose duty it is to patrol the property or premises in question. To ensure that this officer carries out his duties correctly it is common practice to provide a number of check points all of which the officer is required to visit at predetermined intervals. In one system the officer is provided with a clock device into which he can insert any one of several keys mounted at discrete locations in the premises in order to record each visit to each location on a paper tape within the clock device. However, it is possible for an ofi'rcer to be attacked by unauthorized persons lurking on the premises and in such a case the fact that after being attacked the officer has not visited any of the check points would not be known until the following morning and the information would then be useles. if the officer should be attacked he will, of course, desire to summon assistance but this may involve giving the alarm by such means as blowing a whistle or getting to an emergency pushbutton, and he may be prevented from doing either of these things. The object of the invention is to provide a system by which it is possible to monitor at a remote location the movement of the officer so that if he fails to reach a particular check point at a particular time this fact is indicated at once.
The invention consists of a location system comprising a radio transmitter to be carried by a watchman or security guard, the radio transmitter including a loop aerial and a loop demodulator, a plurality of frequency generating means, hereinafter called loop carrier frequency generators each generating a loop carrier frequency and a location frequency by which the loop carrier frequency is modulated, the generators being located at selected points in the area to be patrolled by the watchman or security guard, each location frequency being different and being indicative of the location of the associated generator, means for installation at a monitoring point to receive the transmitted demodulated carrier wave including filters by which the particular location frequencies may be recognized, and means by which the receipt of each particular frequency is indicated.
To promote a full understanding of the invention one embodiment thereof will now be described, by way of example with reference to the accompanying schematic drawings, in which:
FIG. 1 shows the apparatus carried by the officer and two inductive loop frequency generators;
FIG. 2 shows the apparatus at the receiving or monitoring point;
FIG. 3 shows the panel of a suitable indicating device.
Referring first to H6. 1, there is shown an ordinary mobile pocket radio transmitter (less microphone) indicated by a dotted rectangle 11. The rectangle 11 contains a block representing the radio transmitter with a transmitting aerial 12a and having connected to it the transmitter modulator 13. This mobile transmitter may be very small and may be a pocket V.H.F. transmitter of the kind carried by policemen who are on ordinary patrol duties covering different beats. In addition to the transmitting apparatus 11 the officer carries further apparatus indicated by the block 14 together with a loop aerial 15 connected to the block 14 by means of a rod or cable. The block 14 contains a loop detector and a loop demodulator.
At different points in the area to be patrolled by the officer is a plurality of conventional inductive generators for generating both a carrier frequency and a location frequency, two of which are indicated at l6 and 17. Each of these inductive loop frequency generators is arranged to generate a main or carrier frequency and a location frequency by which the carrier frequency is modulated. The carrier frequencies are identical but each of the location frequencies is different so that the location of each particular loop frequency generator may be identified by the unique location frequency.
The loop aerial l5 carried by the officer is designed to receive the loop carrier frequency from each of the inductive loop frequency generators and this loop carrier is applied to the loop detector and demodulated by the loop demodulator contained in the block 14. The modulation frequency. which is, of course, the location frequency, is then applied to the modulator 13 in the officer's transmission equipment ll.
As the officer patrols the area in his charge the transmitter transmits a continuous carrier frequency and each time he pases near one of the inductive loop frequency generators, as represented by 16 and 17, the particular location frequency is transmitted for a short period.
At a location remote from the area being patrolled by the officer is a monitoring apparatus consisting of a receiver 18 having a receiving aerial 18a and tuned to the particular carrier frequency which the radio transmitter carried by the ofiicer is transmitting. The output of the receiver 18 is passed to a demodulator l9 and the demodulated output is passed through a series of filters 20 each one of which responds to one of the location frequencies. Whenever one of the location frequencies is received the particular frequency is recognized by one of the filters and is caused to provide an indication of its presence, for example, by operating a relay which lights a lamp on an indicator 21.
FIG. 3 shows a suitable form of indicator 21 which may consist of a front panel 22 having 10 circular bezcls each of which contains aglass window 23, which may be colored if desired. The 10 indicators are numbered and a lamp is provided behind each window. lt may be arranged that once one of the lamps behind a window 23 has been illuminated by the receipt of one location frequency it will remain illuminated until another location frequency is received, when the indicator corresponding to the location of the new frequency is illuminated and the previously illuminated indicator is extinguished. This mode of operation may conveniently be achieved by the use of relays.
The indicator shown in FIG. 3 in only exemplary and indicating means suitable for any desired number of different locations may easily be provided.
It will be evident from the foregoing description that the system according to the invention offers many advantages. ln the first place it is possible continuously to monitor the movements of the officer. If he does not arrive at a particular place by a particular time then it is known that something is not as it should be, which may be due either to a failure of duty on the part of the officer or to some other cause. Not only does the invention make it possible to detect quickly the kind of condition which the officer is intended to detect, i.e., the presence of intruders or fire, but the monitoring system will also give an indication if the ofiicer should have an accident or be taken ill so that he is unable to continue his patrol.
We claim:
1. A security system comprising signal receiving and transmitting means to be carried by a watchman or security guard, a plurality of inductive frequency generating means for generating a loop carrier frequency and a predetennined location frequency for modulating the loop frequency, said generating means being located at selected points in the area to be patrolled by the watchman or security guard. said signal receiving and transmitting means comprising a loop aerial for receiving both the loop carrier frequency and the location frequency generated by said generating means as the said guard nears said generating means and a loop demodulator for demodulating the received signal, said signal receiving trans mitting means being adapted to transmit the said demodulated signal to a second receiving means for receiving said signal, said second receiving means including a plurality of filters by which the particular location frequencies may be recognized,
dows each corresponding to one of the locations. a lamp behind each window, and means responsive to the recognition of the respective modulating frequency to cause the lamp to be illuminated.

Claims (3)

1. A security system comprising signal receiving and transmitting means to be carried by a watchman or security guard, a plurality of inductive frequency generating means for generating a loop carrier frequency and a predetermined location frequency for modulating the loop frequency, said generating means being located at selected points in the area to be patrolled by the watchman or security guard, said signal receiving and transmitting means comprising a loop aerial for receiving both the loop carrier frequency and the location frequency generated by said generating means as the said guard nears said generating means and a loop demodulator for demodulating the received signal, said signal receiving transmitting means being adapted to transmit the said demodulated signal to a second receiving means for receiving said signal, said second receiving means including a plurality of filters by which the particular location frequencies may be recognized, and indicating means for indicating the receipt of each particular location frequency by said second receiving means.
2. A system as claimed in claim 1 in which the radio transmitter is a V.H.F. transmitter.
3. A system as claimed in claim 1 in which the indicating means comprises an indicator panel having a number of windows each corresponding to one of the locations, a lamp behind each window, and means responsive to the recognition of the respective modulating frequency to cause the lamp to be illuminated.
US733693A 1967-05-31 1968-05-31 Security system with inductive to rf communications links Expired - Lifetime US3573620A (en)

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GB25199/67A GB1165051A (en) 1967-05-31 1967-05-31 Watchman Location System.

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990067A (en) * 1974-09-30 1976-11-02 Sentry Technology Incorporated Electronic security tour system
US4206318A (en) * 1978-06-19 1980-06-03 Gai-Tronics Corporation Intraplant communication system
US4296408A (en) * 1980-04-14 1981-10-20 Portronix Communications Inc. Location transmitting system
US4990025A (en) * 1989-05-03 1991-02-05 Soil Stabilization Inc. Soil stabilizing method and apparatus
US5572192A (en) * 1994-03-17 1996-11-05 Detection Systems, Inc. Personal security system with guard tour features
US6459704B1 (en) 1997-08-12 2002-10-01 Spectrum Tracking Systems, Inc. Method and system for radio-location determination
US20080316007A1 (en) * 2001-09-11 2008-12-25 Zonar Systems, Inc. System and process to ensure performance of mandated inspections
US20090248362A1 (en) * 2001-09-11 2009-10-01 Zonar Systems, Inc. System and process to ensure performance of mandated safety and maintenance inspections
US20100185479A1 (en) * 2006-06-20 2010-07-22 Zonar Systems, Inc. Method and apparatus to analyze gps data to determine if a vehicle has adhered to a predetermined route
US8400296B2 (en) 2001-09-11 2013-03-19 Zonar Systems, Inc. Method and apparatus to automate data collection during a mandatory inspection
US9230437B2 (en) 2006-06-20 2016-01-05 Zonar Systems, Inc. Method and apparatus to encode fuel use data with GPS data and to analyze such data
US9858462B2 (en) 2006-06-20 2018-01-02 Zonar Systems, Inc. Method and system for making deliveries of a fluid to a set of tanks
US10056008B1 (en) 2006-06-20 2018-08-21 Zonar Systems, Inc. Using telematics data including position data and vehicle analytics to train drivers to improve efficiency of vehicle use
US10289651B2 (en) 2012-04-01 2019-05-14 Zonar Systems, Inc. Method and apparatus for matching vehicle ECU programming to current vehicle operating conditions
US10431097B2 (en) 2011-06-13 2019-10-01 Zonar Systems, Inc. System and method to enhance the utility of vehicle inspection records by including route identification data in each vehicle inspection record
US10600096B2 (en) 2010-11-30 2020-03-24 Zonar Systems, Inc. System and method for obtaining competitive pricing for vehicle services
US10665040B2 (en) 2010-08-27 2020-05-26 Zonar Systems, Inc. Method and apparatus for remote vehicle diagnosis
US11341853B2 (en) 2001-09-11 2022-05-24 Zonar Systems, Inc. System and method to enhance the utility of vehicle inspection records by including route identification data in each vehicle inspection record

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US3323063A (en) * 1964-08-07 1967-05-30 Theodore Granik System for re-diffusion of received radio signals
US3439320A (en) * 1967-09-21 1969-04-15 Relton Corp Personnel location system
US3478344A (en) * 1965-06-21 1969-11-11 Ralph K Schwitzgebel Behavioral supervision system with wrist carried transceiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323063A (en) * 1964-08-07 1967-05-30 Theodore Granik System for re-diffusion of received radio signals
US3478344A (en) * 1965-06-21 1969-11-11 Ralph K Schwitzgebel Behavioral supervision system with wrist carried transceiver
US3439320A (en) * 1967-09-21 1969-04-15 Relton Corp Personnel location system

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3990067A (en) * 1974-09-30 1976-11-02 Sentry Technology Incorporated Electronic security tour system
US4206318A (en) * 1978-06-19 1980-06-03 Gai-Tronics Corporation Intraplant communication system
US4296408A (en) * 1980-04-14 1981-10-20 Portronix Communications Inc. Location transmitting system
US4990025A (en) * 1989-05-03 1991-02-05 Soil Stabilization Inc. Soil stabilizing method and apparatus
US5572192A (en) * 1994-03-17 1996-11-05 Detection Systems, Inc. Personal security system with guard tour features
US6459704B1 (en) 1997-08-12 2002-10-01 Spectrum Tracking Systems, Inc. Method and system for radio-location determination
US20080316007A1 (en) * 2001-09-11 2008-12-25 Zonar Systems, Inc. System and process to ensure performance of mandated inspections
US20090248362A1 (en) * 2001-09-11 2009-10-01 Zonar Systems, Inc. System and process to ensure performance of mandated safety and maintenance inspections
US20090256693A1 (en) * 2001-09-11 2009-10-15 Zonar Systems, Inc. System and process to validate inspection data
US11341853B2 (en) 2001-09-11 2022-05-24 Zonar Systems, Inc. System and method to enhance the utility of vehicle inspection records by including route identification data in each vehicle inspection record
US7808369B2 (en) * 2001-09-11 2010-10-05 Zonar Systems, Inc. System and process to ensure performance of mandated inspections
US7944345B2 (en) 2001-09-11 2011-05-17 Zonar Systems, Inc. System and process to ensure performance of mandated safety and maintenance inspections
US8106757B2 (en) 2001-09-11 2012-01-31 Zonar Systems, Inc. System and process to validate inspection data
US8400296B2 (en) 2001-09-11 2013-03-19 Zonar Systems, Inc. Method and apparatus to automate data collection during a mandatory inspection
US8972179B2 (en) 2006-06-20 2015-03-03 Brett Brinton Method and apparatus to analyze GPS data to determine if a vehicle has adhered to a predetermined route
US9858462B2 (en) 2006-06-20 2018-01-02 Zonar Systems, Inc. Method and system for making deliveries of a fluid to a set of tanks
US10013592B2 (en) 2006-06-20 2018-07-03 Zonar Systems, Inc. Method and system for supervised disembarking of passengers from a bus
US10056008B1 (en) 2006-06-20 2018-08-21 Zonar Systems, Inc. Using telematics data including position data and vehicle analytics to train drivers to improve efficiency of vehicle use
US10223935B2 (en) 2006-06-20 2019-03-05 Zonar Systems, Inc. Using telematics data including position data and vehicle analytics to train drivers to improve efficiency of vehicle use
US20100185479A1 (en) * 2006-06-20 2010-07-22 Zonar Systems, Inc. Method and apparatus to analyze gps data to determine if a vehicle has adhered to a predetermined route
US9230437B2 (en) 2006-06-20 2016-01-05 Zonar Systems, Inc. Method and apparatus to encode fuel use data with GPS data and to analyze such data
US10665040B2 (en) 2010-08-27 2020-05-26 Zonar Systems, Inc. Method and apparatus for remote vehicle diagnosis
US11080950B2 (en) 2010-08-27 2021-08-03 Zonar Systems, Inc. Cooperative vehicle diagnosis system
US10311272B2 (en) 2010-11-09 2019-06-04 Zonar Systems, Inc. Method and system for tracking the delivery of an object to a specific location
US10572704B2 (en) 2010-11-09 2020-02-25 Zonar Systems, Inc. Method and system for tracking the delivery of an object to a specific location
US10354108B2 (en) 2010-11-09 2019-07-16 Zonar Systems, Inc. Method and system for collecting object ID data while collecting refuse from refuse containers
US10331927B2 (en) 2010-11-09 2019-06-25 Zonar Systems, Inc. Method and system for supervised disembarking of passengers from a bus
US10600096B2 (en) 2010-11-30 2020-03-24 Zonar Systems, Inc. System and method for obtaining competitive pricing for vehicle services
US10431097B2 (en) 2011-06-13 2019-10-01 Zonar Systems, Inc. System and method to enhance the utility of vehicle inspection records by including route identification data in each vehicle inspection record
US10289651B2 (en) 2012-04-01 2019-05-14 Zonar Systems, Inc. Method and apparatus for matching vehicle ECU programming to current vehicle operating conditions

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