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WO1994027261A1 - Porte emetteur-recepteur - Google Patents

Porte emetteur-recepteur Download PDF

Info

Publication number
WO1994027261A1
WO1994027261A1 PCT/GB1994/001045 GB9401045W WO9427261A1 WO 1994027261 A1 WO1994027261 A1 WO 1994027261A1 GB 9401045 W GB9401045 W GB 9401045W WO 9427261 A1 WO9427261 A1 WO 9427261A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmitter
signal
receiver
set according
receiver set
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.)
Ceased
Application number
PCT/GB1994/001045
Other languages
English (en)
Inventor
Graham Guymer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU66557/94A priority Critical patent/AU6655794A/en
Publication of WO1994027261A1 publication Critical patent/WO1994027261A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/0222—Message structure or message content, e.g. message protocol
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons
    • G08B21/0202—Child monitoring systems using a transmitter-receiver system carried by the parent and the child
    • G08B21/023—Power management, e.g. system sleep and wake up provisions

Definitions

  • the present invention relates to a transmitter/receiver set suitable for use by a person charged with the responsibility of looking after another individual. Typically, although not exclusively the responsible person might be a parent in charge of a child.
  • An object of this invention is to arrange the transmitter-receiver set so that it is not easy for a third party to render it inoperative by interfering with the part of the set that is carried by the child or other individual.
  • a transmitter-receiver set for use by a person charged with the responsibility of looking after another individual comprising one device to be carried by said other individual which is provided with a signal emitting means and multi-state means which enable operation of the signal emitting means when in one state and which render the signal emitting means inoperable when in another state, and another device to be carried by said responsible person, said other device including means operable to send out a signal which effects changes between said one state and said other state of said multi-state means, and means operable to transmit a radio signal which activates said signal emitting means in said one device when received thereby.
  • the signal which effects changes between the states is a uniquely encoded signal which may be a pulse position modulation coded signal. This allows, for example, a parent to activate their own child's alarm without setting off any similar alarm in the effective range of the transmitter.
  • the two devices of the set are adapted to be directly electrically connected to allow the uniquely coded signal to be transferred directly from said other device to said one device to effect the change of state in the multi-state means.
  • the radio signal uses the same unique coding as the signal which effects changes between the states in the multi-state device.
  • the signal emitting means may comprise an audio signal emitting means or a tracking signal emitting means.
  • the radio signal may be passed from the other device to said one device via a cellular network.
  • Either or both the devices may incorporate an LED indicator providing a flash light output when battery voltage of battery powered means for operating the respective device falls below a safe level.
  • Each of the devices may comprise a radio transmitter/ receiver which is tuned to complete a radiolink by one receiving a signal emitted by the other.
  • the signal emitting means comprise an audio alarm signal emitting means
  • each of the devices may be provided with actuating means operable by the respective one of the other individual and the responsible person to initiate operation of the alarm means and only the other device that is to be carried by the responsible person is provided with means for deactivating the alarm means.
  • the audible signal may be unpleasant so that a child will be disinclined to activate it unnecessarily.
  • the other device that is to be carried by the responsible person may also include alarm means operable by operation of the tuned transmitter- receiver radio link to emit an alarm signal when the other individual operates the actuating means included in his unit.
  • transmitter-receiver set for use by a parent to monitor the whereabouts of a child will be described now by way of example with reference to the accompanying drawing which is a circuit diagram of the transmitter and receiver devices of the set.
  • the transmitter 10 uses pulse position modulation (PPM) to transmit a pre-programmed "word” or code at the carrier frequency.
  • PPM pulse position modulation
  • the receiver 11 for its part amplifies, de-modulates, and conditions the .incoming signal, which is then passed on to a pre-programmed decoder circuit 12.
  • the decoder 12 "recognises” the incoming signal as being the valid code, the receiver 11 then sets off an audible alarm.
  • Such an arrangement of transmitter/receiver meeting DTI approvals typically has an rf power output in the range 250-350 ⁇ Watts and has a receiving range of some 100-200 metres under normal operating conditions.
  • the units 10 and 11 incorporate an LED indicator providing a flashing light output when the battery voltage falls below a safe level.
  • a dedicated encoder integrated circuit 13 which has a built-in non-volatile memory, programmed at the time of manufacture/test with the unique word/code which remains "written" into the memory of the device for the whole period of its service life.
  • the encoder 13 When the encoder 13 is activated, it outputs a series of pulses which represent the unique word/code in the form of a series of 0s and Is at a rate determined by a rate oscillator 14.
  • These encoded signals are passed to a modulator circuit 15, which modulates the output from the carrier frequency oscillator 16, in effect switching the carrier frequency on and off, producing pulses of radio frequency emissions which represent the unique word/code.
  • the signal sequence timer 17 which is connected to the oscillator 16 allows the transmitter 10 to produce a given sequence of pulses at an aerial 18, before returning to a standby condition. This process is repeated for as long as an alarm switch 19 is in the "alarm" position.
  • Differs Whilst the integrity of the transmitter/receiver apparatus is guaranteed by the detailed design of the encoder/decoder pre-programmed "differs", rf interference between similar transmitter/receiver sets is nevertheless a potential problem.
  • Differs here is defined as the number of different word codes which can be written into the non-volatile memory of the integrated circuits. Typically, this could be tens of thousands) . .Assuming that a c ⁇ r ⁇ mon carrier frequency were adopted and two independent operators initiated an "alarm" sequence in close proximity to each other, it is possible that unacceptable interference could arise.
  • the transmitter 10 outputs a series of rf pulses via the aerial 18, as shown in the drawing.
  • the PPM transmission provides a synchronizing pulse which sets a rate oscillator 21 in the receiver 11 to accept transmission.
  • the receiver includes an aerial 22 which picks up the incoming radio signal and produces a sympathetic electrical signal, which is amplified by the signal amplifier 23, de-modulated by the de-modulator circuit 24, and then conditioned at the signal conditioner 25. Finally, the signal is fed into the decoder integrated circuit 12, via Port A.
  • the decoder integrated circuit 12 processes the signal to validate the incoming code/word, and if the word is identical to that pre-programmed into its memory, then the decoder produces an output at Port C which is passed to an alarm circuit, which typically incorporates a piezoelectric-electric warning device.
  • a latch circuit 29 ensures that the alarm can continue to sound when the output from Port C changes.
  • the receiver 11 may be stored in a non-armed state with j-ftinimum drainage to the batteries, but can be easily armed for immediate use.
  • the life of the transmitter's batteries is relatively long, since the transmitter 10 is only substantially active when being used to transmit an alarm signal: it does not transmit continuously.
  • the arming method is an attempt to frustrate an .individual from prematurely de-activating the alarm mechanism, and is described below.
  • the receiver 11 and transmitter 10 are first connected electrically together by means of a coaxial cable 26.
  • a receiver arm switch 27 is closed to energize the receiver circuits and the transmitter alarm switch 19 is closed to enable the code word to be injected directly into the receiver decoder integrated circuit 12.
  • the decoder 12 produces an output at Port C.
  • This signal is passed to an arm logic circuit 28 via the now closed coaxial link and Port D.
  • the arm logic circuit 28 now produces an output at Port E, energizing a Mosfet transistor Tl which is connected in parallel with the arm switch 27.
  • the arming sequence provides an alarm sounder 30 with a brief functional check, the alarm sounder being connected to the Port C of the decoder 12.
  • the receiver 11 is now armed, and for user convenience, the unit is provided with an LED to indicate that the receiver is in its active mode.
  • the arm logic circuit 28 involves a logic flip/flop circuit in which the first signal received at Port D will cause an output at Port E. This potential remains until such time as another signal is applied at Port D, which then reverses the output at Port E.
  • the disarming of the receiver 11 would be necessary in the following circumstances: a) After an alarm sequence has been initiated and a risk condition has been perceived to have passed.
  • the transmitter/receiver are connected by means of the coaxial link 26.
  • the receiver arm switch 27 is positioned to "off” and the transmitter alarm switch 19 is positioned to "alarm”.
  • the pre-prcxjrammed signal is now injected directly into the receiver decoder circuit 12 which, assuming the validated code word is received, produces an output at Port C.
  • the arm logic circuit 28 receives a feed at Port D, causing it to switch off the Mosfet transistor Tl.

Landscapes

  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)

Abstract

Porte émetteur-récepteur destiné à être utilisé par une personne responsable de la surveillance d'une autre personne. Le récepteur (11) qui doit être porté par la personne surveillée est équipé d'une alarme (30) et d'un décodeur (12). Le décodeur (12) sert à faire fonctionner l'alarme (30) lorsqu'il se trouve dans un premier état et à empêcher son fonctionnement lorsqu'il se trouve dans un autre état. L'émetteur (10) comprend un codeur (13) fonctionnant pour envoyer un signal codé de manière unique effectuant des changements entre les deux états distincts du décodeur (12), et une antenne (18) servant à transmettre un signal radio destiné à faire fonctionner l'alarme (30) du récepteur (11) lorsque ce dernier reçoit le signal. Le récepteur (11) et l'émetteur (10) sont conçus pour être directement reliés électriquement afin de permettre le transfert direct du signal codé de manière unique entre l'émetteur (10) et le récepteur (11).
PCT/GB1994/001045 1993-05-14 1994-05-16 Porte emetteur-recepteur Ceased WO1994027261A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU66557/94A AU6655794A (en) 1993-05-14 1994-05-16 A transmitter-receiver set

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9309960.4 1993-05-14
GB939309960A GB9309960D0 (en) 1993-05-14 1993-05-14 A transmitter-receiver set

Publications (1)

Publication Number Publication Date
WO1994027261A1 true WO1994027261A1 (fr) 1994-11-24

Family

ID=10735483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001045 Ceased WO1994027261A1 (fr) 1993-05-14 1994-05-16 Porte emetteur-recepteur

Country Status (3)

Country Link
AU (1) AU6655794A (fr)
GB (1) GB9309960D0 (fr)
WO (1) WO1994027261A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2729028A1 (fr) * 1994-12-20 1996-07-05 Huang Dennis Systeme radio de recherche personnalisee avec rappel d'attention comportant des sous-ensembles
GB2298068A (en) * 1995-02-20 1996-08-21 Barbara Ann Roden Personal safety alarm
GB2320598A (en) * 1996-12-17 1998-06-24 Thomas Henry Butler Signal sending and receiving system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598272A (en) * 1984-08-06 1986-07-01 Cox Randall P Electronic monitoring apparatus
US4772876A (en) * 1986-10-10 1988-09-20 Zenith Electronics Corporation Remote security transmitter address programmer
WO1990007170A1 (fr) * 1988-12-13 1990-06-28 John Donovan Systeme d'alarme et de securite

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598272A (en) * 1984-08-06 1986-07-01 Cox Randall P Electronic monitoring apparatus
US4772876A (en) * 1986-10-10 1988-09-20 Zenith Electronics Corporation Remote security transmitter address programmer
WO1990007170A1 (fr) * 1988-12-13 1990-06-28 John Donovan Systeme d'alarme et de securite

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2729028A1 (fr) * 1994-12-20 1996-07-05 Huang Dennis Systeme radio de recherche personnalisee avec rappel d'attention comportant des sous-ensembles
GB2298068A (en) * 1995-02-20 1996-08-21 Barbara Ann Roden Personal safety alarm
GB2320598A (en) * 1996-12-17 1998-06-24 Thomas Henry Butler Signal sending and receiving system

Also Published As

Publication number Publication date
AU6655794A (en) 1994-12-12
GB9309960D0 (en) 1993-06-30

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