EP1859421B1 - Dispositif de surveillance multicanal pour enfants et procede - Google Patents

Dispositif de surveillance multicanal pour enfants et procede Download PDF

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Publication number
EP1859421B1
EP1859421B1 EP06710008A EP06710008A EP1859421B1 EP 1859421 B1 EP1859421 B1 EP 1859421B1 EP 06710008 A EP06710008 A EP 06710008A EP 06710008 A EP06710008 A EP 06710008A EP 1859421 B1 EP1859421 B1 EP 1859421B1
Authority
EP
European Patent Office
Prior art keywords
signal
unit
channel
identifier signal
identifier
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.)
Not-in-force
Application number
EP06710008A
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German (de)
English (en)
Other versions
EP1859421A1 (fr
Inventor
Liu Chi Cheung
David Gooch
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.)
Jackel International Ltd
Original Assignee
Jackel International Ltd
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 Jackel International Ltd filed Critical Jackel International Ltd
Publication of EP1859421A1 publication Critical patent/EP1859421A1/fr
Application granted granted Critical
Publication of EP1859421B1 publication Critical patent/EP1859421B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G08B21/0205—Specific application combined with child monitoring using a transmitter-receiver system
    • G08B21/0208—Combination with audio or video communication, e.g. combination with "baby phone" function

Definitions

  • the invention relates to a multi channel child monitor and method.
  • Such monitors typically consist of a radio frequency (RF) transmitter unit which is placed in close proximity to the child being monitored, and an RF receiver unit, which is placed in close proximity to the carer carrying out the monitoring.
  • RF radio frequency
  • the transmitter unit transmits sound from the child's environment over an RF wireless link to the receiver unit such that the carer can listen in.
  • Known baby monitors use pre-determined frequencies or "channels" which can be selected by the carer, to allow monitoring through one frequency or channel. Multiple channels are required in case nearby transmitter-receiver pairs interfere with one another. To avoid receiving this interference it is necessary to change channels on one of the transmitter-receiver pairs. See for example GB 2,346,042 .
  • the invention comprises a multi channel child monitor system of the type shown in Figure 1 comprising a child transmitter unit 100 and a parent receiver unit 102.
  • the transmitter unit generates as a pilot tone an identifier signal which it modulates onto a channel carrier signal.
  • the pilot tone is imposed on the new channel.
  • an identifier signal detector scans all of the channels to detect the pilot tone and locks onto the channel carrying the pilot tone.
  • the receiver unit automatically tracks any changes in channel triggered at the transmitter unit such that it is not necessary to switch both units.
  • the information signal itself for example the sounds picked up at the transmitter unit are also sent over the channel such that the receiver can broadcast the sound to the carer.
  • the transmitter unit designated generally 200 includes a radio transmitter 202 which transmits an RF signal via an antenna 204.
  • the radio transmitter receives an input carrier frequency signal from a crystal oscillator 206, an information signal comprising an audible environmental sound (audio) signal from a microphone 208 and a pilot tone identifier signal from a pilot tone generator 210.
  • the crystal oscillator 206 is a variable frequency oscillator controlled for example, by a phase locked loop (PLL) and switchable between carrier frequencies representing different channels by a channel selector switch 212.
  • PLL phase locked loop
  • the modulation signal is picked up by a receiver unit 300 via an antenna 302 which feeds the signal to a radio receiver 304.
  • the radio receiver channel frequencies are governed by a local oscillation frequency crystal oscillator 306 again a variable frequency oscillator controlled for example, by a phase locked loop (PLL).
  • the radio receiver 304 outputs the received signal to a muting control component 309 and an automatic channel selector logic controller 308.
  • the muting control 309 feeds an audio signal in a non-mute mode to an audio amplifier 310 and the audio signal is broadcast by a speaker 312.
  • the logic controller 308 controls the muting control 309 between a mute and non-mute state as described in more detail below.
  • the logic controller further controls the receiver channel frequency as governed by the oscillator 306, again as discussed in more detail below.
  • the logic controller is further associated with a data storage means 314 storing identifier signal data.
  • Operation of the system can be further understood with reference to Figures 4 and 5 .
  • Figure 4 shows the steps performed at a transmitter unit.
  • the channel is selected on the transmitter unit. This is typically done manually when the user recognises that a search is taking place.
  • the controller for example comprised within the channel selector switch 212 controls the crystal oscillator 206 accordingly to ensure that the radio transmitter transmits on the selected channel carrier frequency.
  • a transmitter unit modulates the carrier frequency with the information signal comprising the audio signal received at microphone 208. It will be appreciated that although a simple modulation scheme is one option, any appropriate manner of carrying the information signal on the relevant channel can be adopted as will be apparent to the skilled reader. Further the information signal can carry any relevant information on the respective channel.
  • the transmitter unit modulates the carrier signal with the pilot tone identifier signal from the pilot tone generator 13.
  • the pilot tone can be any appropriate signal, for example a predetermined frequency which will be recongisable at the receiver unit or a coded signal using techniques such as OOF (on-off) modulation, FSK (frequency shift keying) modulation or any other appropriate coding scheme.
  • the scheme adopted is preferably selected so as to be easily separated from the information signal by appropriate means such as a frequency filter.
  • the pilot tone can simply be any signal identifiable by the receiver unit or can carry additional information such as the identity of the channel selected, or a unique code common to the transmitter-receiver pair to ensure that pilot tone signals from nearby transmitter-receiver pairs will not be identified as the correct signal inadvertently.
  • pilot tone can be the same for all channels in which case a simple tone generator can be adopted.
  • different tones can be used for different channels and different information carried as appropriate for example under the control of a controller included in the channel selector switch or elsewhere the transmitter unit 200.
  • the pilot tone can be generated as a constant tone, intermittently or only upon a channel change as long as the receiver unit logic is correspondingly adopted.
  • the pilot tone can be set on the respective channel in any appropriate manner, for example by being modulated onto a separate frequency within a defined channel band.
  • the information signal is constantly imposed on the carrier frequency and a simple pilot tone is constantly generated ensuring minimal control logic and memory is required.
  • the transmitter unit logic for example the channel selector 212, monitors for further changes in channel as discussed above and upon detection of a change repeats the steps described above.
  • the radio receiver 304 selects a first channel under the control of controller 308 and crystal oscillator 306.
  • the received signal is filtered, demodulated or otherwise processed as appropriate to detect whether any pilot tone is received.
  • the controller 308, acting as an identifier signal pilot tone detector establishes whether the pilot tone has been detected. If not then the controller 308 controls the receiver 304 and oscillator 306 to scan the next channel, as when the transmitter and receiver unit are on different channels, the signal from the transmitter is no longer synchronised with the receiver such that the receiver either receives a distorted signal from the transmitter operating on a nearby channel or else it just receives white noise.
  • the step of identifying whether the pilot tone is detected may require access to the data storage means 314 by the controller of 318 to compare any received demodulation pilot tone signal with stored values to ensure that the correct pilot tone signal is received.
  • the pilot tone comprises a coded signal carrying additional information such as identification of the specific transmitter unit sending the signal.
  • the controller 308 locks the radio receiver onto the channel via crystal oscillator 306.
  • the radio receiver demodulates the information signal and in block 510 the controller 308 changes the state of the muting control unit 309 to non-mute allowing the audio amplifier in block 512 to broadcast the audio signal via speaker 312.
  • the receiver unit monitors for loss of pilot tone which can occur, for example, because of low battery or power failure in the transmitter, physical separation of the unit in the pair beyond the transmitting range, strong interference from other transmitting units or electronic devices or a faulty transmitter device. If the pilot tone is lost then the receiver unit repeats the scanning process described above.
  • the receiver unit similarly monitors for a simple pilot tone on any channel and only scans when the pilot tone is lost.
  • the presence of the pilot tone acts to trigger automatic adoption of the channel on which it is being carried at the receiving unit. There is no need for the receiving unit to confirm its identity or its detection of the pilot tone before it demodulates and broadcasts the audio signal via speaker 31. Because the pilot tone is modulated onto the transmission channel signal onto which the information signal channel is also modulated, the pilot tone serves both to identify the correct channel for the radio receiver to initially lock on to and to continuously indicate to the receiving unit whether the transmission channel onto which it is currently locked is the correct one. The continuous presence of the pilot tone signal on the channel on which the information signal is being transmitted removes the need for any further verification processes between the transmitter and receiver units during operation of the child monitoring system.
  • a proximity detector of a type described in international patent application number PCT/GB2004/001678 may incorporate a channel tracking approach as described herein.
  • a transmitter child unit sends a signal to a receiver parent unit and the receiver parent unit generates an alarm if the signal is lost or drops below a predetermined threshold indicating that the child unit has passed out of range.
  • Such a system can, once again, suffer from problems switching between multiple channels. It will be apparent to the skilled reader that the arrangement described above can be simply modified to accommodate a proximity monitoring system by changing the nature of the information signal generated.
  • the controller 308 may comprise a microprocessor for timing, power control and logical operation.
  • the generation and modulation of the carrier signal and the selection of channels can again be according to any appropriate scheme.
  • the channels span the band 49.82 to 49.98MHZand 5 channels are provided but it will be appreciated that any number of channels on any appropriate band can be adopted.
  • the scanning regime and the time taken to determine if a pilot tone is carried on an appropriate channel can be any appropriate scheme for example one scan per second.
  • pilot tone can be generated in any appropriate manner and either form a simple tone or complex coded tone which can be governed by appropriate circuitry or retrieved from memory as required. Any coding scheme can be adopted. Yet further the arrangement can be adopted in any multi-channel wireless transmission configuration such as RF and other frequency bands.

Claims (18)

  1. Unité multivoie de surveillance d'enfant comprenant un émetteur multivoie et un générateur de signal identificateur dans laquelle le générateur de signal identificateur est contrôlable pour générer un signal identificateur pour déclencher l'adoption par une unité réceptrice d'une voie portant ledit signal identificateur et l'émetteur multivoie est contrôlable pour émettre sur l'une d'une pluralité de voies d'émission et pour émettre ledit signal identificateur généré sur ladite voie d'émission, dans laquelle le signal identificateur est modulé sur un signal de voie d'émission.
  2. Unité selon la revendication 1, commutable manuellement entre des voies d'émission.
  3. Unité selon l'une quelconque des revendications précédentes, dans laquelle le générateur de signal identificateur est agencé pour générer une tonalité pilote de fréquence caractéristique en tant que signal identificateur, ou
    dans laquelle le générateur de signal identificateur est agencé pour générer une tonalité pilote de séquence codée en tant que signal identificateur.
  4. Unité selon l'une quelconque des revendications précédentes, comprenant en outre un générateur de signal d'information dans laquelle l'émetteur est agencé pour émettre le signal d'information sur la voie d'émission.
  5. Unité selon la revendication 4, dans laquelle le signal d'information comprend un signal audio, ou
    dans laquelle le signal d'information comprend un signal de proximité.
  6. Unité multivoie de surveillance d'enfant comprenant un récepteur multivoie, un détecteur de signal identificateur et un contrôleur, dans laquelle le contrôleur est agencé pour contrôler le récepteur pour rechercher et se verrouiller sur une voie de réception sur laquelle un signal identificateur est détecté par le détecteur.
  7. Unité selon la revendication 6, dans laquelle le récepteur est contrôlable pour balayer de multiples voies pour détecter un signal identificateur.
  8. Unité selon la revendication 6 ou la revendication 7, dans laquelle le détecteur de signal identificateur est agencé pour décoder le signal identificateur.
  9. Unité selon l'une quelconque des revendications 6 à 8, dans laquelle le récepteur est en outre contrôlable pour extraire un signal d'information d'un signal reçu.
  10. Unité selon la revendication 9, dans laquelle le signal d'information comprend un signal audio, ou
    dans laquelle le signal d'information comprend un signal de proximité.
  11. Unité selon l'une quelconque des revendications 6 à 10, dans laquelle le récepteur est en outre contrôlable pour surveiller la perte du signal identificateur, et de préférence
    dans laquelle le contrôleur est agencé pour commander au récepteur de rechercher et de se verrouiller sur une voie de réception sur laquelle le signal identificateur est détecté à la perte du signal identificateur.
  12. Unité selon l'une quelconque des revendications 6 à 11, comprenant en outre une unité de silencieux agencée pour rendre un signal d'information silencieux jusqu'à ce qu'un signal identificateur soit détecté.
  13. Système multivoie de surveillance d'enfant comprenant une unité selon la revendication 1 et une unité selon la revendication 6, et de préférence
    comprenant en outre une unité selon l'une quelconque des revendications 2 à 6 et/ou 7 à 12.
  14. Procédé d'identification d'une voie d'émission dans un système multivoie de surveillance d'enfant comprenant les étapes, effectuées au niveau d'une unité émettrice, consistant à générer un signal identificateur pour déclencher l'adoption par une unité réceptrice d'une voie portant ledit signal identificateur, sélectionner l'une d'une pluralité de voies d'émission, moduler le signal identificateur sur un signal de voie d'émission, et émettre le signal identificateur sur la voie d'émission.
  15. Procédé selon la revendication 14, comprenant en outre l'étape consistant à émettre un signal d'information sur la voie d'émission.
  16. Procédé d'identification d'une voie de réception dans un système multivoie de surveillance d'enfant comprenant les étapes consistant à rechercher une pluralité de voies de réception et à se verrouiller sur une voie de réception sur laquelle un signal identificateur est reçu.
  17. Procédé selon la revendication 16, comprenant en outre l'étape consistant à extraire un signal d'information du signal reçu, et de préférence
    comprenant en outre l'étape consistant à diffuser le signal d'information à l'identification du signal identificateur.
  18. Processeur configuré pour mettre en oeuvre un procédé selon l'une quelconque des revendications 14 à 17.
EP06710008A 2005-03-11 2006-03-06 Dispositif de surveillance multicanal pour enfants et procede Not-in-force EP1859421B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0505069.5A GB0505069D0 (en) 2005-03-11 2005-03-11 Multi channel child monitor and method
PCT/GB2006/000788 WO2006095152A1 (fr) 2005-03-11 2006-03-06 Dispositif de surveillance multicanal pour enfants et procede

Publications (2)

Publication Number Publication Date
EP1859421A1 EP1859421A1 (fr) 2007-11-28
EP1859421B1 true EP1859421B1 (fr) 2008-10-15

Family

ID=34508933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06710008A Not-in-force EP1859421B1 (fr) 2005-03-11 2006-03-06 Dispositif de surveillance multicanal pour enfants et procede

Country Status (7)

Country Link
EP (1) EP1859421B1 (fr)
AT (1) ATE411582T1 (fr)
AU (1) AU2006221847A1 (fr)
CA (1) CA2599527A1 (fr)
DE (1) DE602006003195D1 (fr)
GB (1) GB0505069D0 (fr)
WO (1) WO2006095152A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009046548A1 (de) * 2009-11-09 2011-05-12 Robert Bosch Gmbh Mikrofonsystem sowie Verfahren zur Auswahl einer Nutzfrequenz für ein oder das Mikrofonsystem sowie Computerprogramm

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346042A (en) * 1998-11-19 2000-07-26 Lindam Ltd Sound monitoring apparatus
US6369713B1 (en) * 2000-03-24 2002-04-09 Ilife Systems, Inc. System and method for seizing a communication channel in a commercially available child monitor
DE202004014835U1 (de) * 2003-04-09 2005-02-24 Reichert, Curt Überwachungseinrichtung

Also Published As

Publication number Publication date
EP1859421A1 (fr) 2007-11-28
DE602006003195D1 (de) 2008-11-27
AU2006221847A1 (en) 2006-09-14
CA2599527A1 (fr) 2006-09-14
ATE411582T1 (de) 2008-10-15
WO2006095152A1 (fr) 2006-09-14
GB0505069D0 (en) 2005-04-20

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