WO2004015643A1 - Moniteur audio sans fil - Google Patents

Moniteur audio sans fil Download PDF

Info

Publication number
WO2004015643A1
WO2004015643A1 PCT/EP2003/006904 EP0306904W WO2004015643A1 WO 2004015643 A1 WO2004015643 A1 WO 2004015643A1 EP 0306904 W EP0306904 W EP 0306904W WO 2004015643 A1 WO2004015643 A1 WO 2004015643A1
Authority
WO
WIPO (PCT)
Prior art keywords
transceiver
mode
audio receiving
receiving mode
voice activity
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/EP2003/006904
Other languages
English (en)
Inventor
Adrian D Charity
Douglas Ealey
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Priority to DE60320428T priority Critical patent/DE60320428D1/de
Priority to AU2003242776A priority patent/AU2003242776A1/en
Priority to EP03783995A priority patent/EP1543483B1/fr
Publication of WO2004015643A1 publication Critical patent/WO2004015643A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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

Definitions

  • the first unit is a listening device.
  • the listening device transmits audio signals from the intended area to the second unit, which is a monitoring device.
  • the monitoring device relays the received audio signal to a user.
  • a typical device may in use provide constant audio monitoring.
  • the transmitter simply broadcasts continuously, and control is limited to adjusting the volume of the monitoring device.
  • Published application US 4531115 uses a generated single audio frequency source at the transmitter.
  • the receiver is notch filtered to that audio frequency so only signal energy from that source may be used to trigger an alarm.
  • the method by which the transmitter is activated is not specified.
  • Published application US 5812056 proposes radio frequency signal delay measurement between two devices to determine the distance of separation between the supervisory adult and child.
  • the present invention provides means for remotely detecting voice activity.
  • the invention provides a communication system, as claimed in claim 1.
  • the invention provides a method of operating a communication system, as claimed in claim 17
  • FIG. 1 shows the frequency characteristics of two modes of operation of the invention.
  • FIG. 2 shows an embodiment of a transceiver 2 in accordance with the present invention.
  • FIG. 3 shows a preferred usage of a transceiver 60 in accordance with the present invention.
  • FIG. 1 shows the frequency characteristics of two modes of operation of the invention. There is a narrowband audio receiving mode 12. There is also a standard audio receiving mode 10.
  • FIG. 2 shows an embodiment of a transceiver 2 in accordance with the present invention.
  • the transceiver 2 of figure 2 can transmit speech from a user of the device.
  • the transceiver 2 comprises a microphone 34 that provides a signal and a reversibly switchable filter 46 that provides either a standard or narrowband version of the signal from the microphone 34.
  • the transceiver 2 of figure 2 is able to apply filters to the received sound that are of the general form shown in figure 1.
  • the transceiver 2 also has a controller 20 and a memory 32 Controller 20 may be a microprocessor.
  • Transmission circuit 22 transmits the signal from the filter 46. Transmission circuit 22 transmits via switch 24 and antenna 26.
  • the transceiver 2 of figure 2 also comprises a display screen 42 and keypad 44, which serve as part of the user interface circuitry of the transceiver. At least the keypad 44 portion of the user interface circuitry is activateable by the user. Voice activation of the transceiver, or other means of interaction with a user, may also be employed.
  • Signals received by the transceiver are routed by the switch 24 to receiving circuitry 28. From there, the received signals are routed to controller 20 and audio processing circuitry 38.
  • a loudspeaker 40 is connected to audio circuit 38. Loudspeaker 40 forms a further part of the user interface.
  • a data terminal 36 may be provided. Terminal 36 provides a signal comprising data for transmission by transmitter circuit 22, switch 24 and antenna 26.
  • the transceiver 2 is capable of storing in the memory 32 the data defining the modes of operation of the transceiver 2.
  • FIG. 3 shows a preferred usage of a transceiver 60 in accordance with the present invention.
  • An infant 50 emits a sound 52 that is detected by the transceiver 60. If the sound exceeds a threshold determined by controller 62 of transceiver 60, a signal is transmitted.
  • the first transceiver 60 contains reversibly switchable audio receiving modes, the first being a narrow-bandwidth audio receiving mode, and the second a standard audio receiving mode .
  • a second of possibly many transceivers 64 receives the transmission of the first transceiver 60.
  • Transceiver 64 provides a call alert and/or vibrates to alert user 54.
  • User 54 may then send a command using the second transceiver 64 to change modes of operation of the first transceiver 60.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1 :
  • Figure 3 illustrates the scenario of the first preferred embodiment.
  • an infant 50 emits a sound 52 that is detected by the transceiver 60. If the sound exceeds a threshold determined by controller 62 of transceiver 60, a signal is transmitted.
  • a second transceiver 64 receives the transmission of the first transceiver 60 and provides a call alert and/or vibrates to alert user 54.
  • user 54 may then send a command using the second transceiver 64 to change modes of operation of the first transceiver 60. Additional optional transceivers are not shown for simplicity.
  • the first narrow bandwidth audio receiving mode is designed to be most sensitive to infant voice frequencies, in accordance with figure 1. See plot 12 of figure 1. It would be expected that this mode would be the default monitoring mode in this embodiment.
  • the first transceiver 60 would employ a voice level threshold based on comparison between current signal levels and long term or prior signal levels constituting background noise. This threshold level may optionally be made user- adjustable.
  • the first narrow-bandwidth audio receiving mode can operate with a bandwidth that is optimal for detecting the frequencies of an infant . These frequencies may be those in which the volume of sound is greatest when a baby is crying. In comparison to a prior art listening device of broader bandwidth:
  • This narrow bandwidth may help to screen out noises other than a babies' cries, making more precise the selection of instances at which a listening adult is notified of noise at the baby's location; (ii) It may also require less battery power to operate in the narrow-bandwidth receiving mode; (iii) Finally, the first and second portable units 60 and 64 may also require less battery power, because the first unit 60 will be triggered less often to communicate with the second transceiver 64.
  • the first transceiver 60 may automatically employ any or all of the following modes of operation: (i) The first transceiver 60 transmits audio for a limited period of time following voice activity detection; (ii) The first transceiver 60 changes its transmission mode from voice-detection based transmission to continuous transmission;
  • the first transceiver 60 changes its audio receiving mode from the narrow bandwidth audio receiving mode to the standard audio receiving mode, or vice-versa, depending on the current audio receiving mode .
  • Any automatic change of mode may optionally last for only a limited period, before reverting to the previous mode.
  • the second transceiver 64 can be reversibly changed between indicating voice detection and continuously monitoring the transmissions of the first transceiver 60, either by the user by direct intervention, setting an automatic mode change, or under control of the first transceiver 60 via a wireless radio link.
  • the second transceiver 64 may additionally remotely control modes of the first transceiver 60, either as a consequence of user intervention, or automatically. These modes may comprise any or all of the following:
  • the second transceiver 64 can remotely alter the transmission mode of the first transceiver between voice- detection based transmission and continuous transmission;
  • the second transceiver 64 can remotely alter the audio receiving mode of the first transceiver between a narrow bandwidth audio receiving mode and a standard audio receiving mode; (iii) The second transceiver 64 can remotely alter the level of gain applied to the audio signal in the first transceiver.
  • any remote change of mode may optionally last for only a limited period, before reverting to the previous mode.
  • the first and second transceivers are functionally interchangeable, with each comprising the necessary means to perform the role of either first or second transceiver as described herein.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1 :
  • the second preferred embodiment is similar to embodiment 1, except that the transceivers are based upon current portable two-way radios.
  • This second embodiment provides the additional benefit of multiple selectable transmission channels. This allows many transceiver pairs or groups to operate independently, within a locality where only a single-frequency transmission capability would cause interference between monitoring activities.
  • Each two-way radio's controller would be modified with the control options and modes outlined above, in connection with embodiment 1 of the invention.
  • the two-way radios- would be equipped with an audio filter that could provide the two bandwidths 10 and 12 shown in figure 1.
  • the two-way radios would be able to switch between these filter modes, as described above in connection with embodiment 1.

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Pens And Brushes (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Selective Calling Equipment (AREA)
  • Burglar Alarm Systems (AREA)
  • Transceivers (AREA)

Abstract

Un moniteur audio sans fil permet de détecter à distance une activité vocale. Un premier émetteur / récepteur radio portatif (60) peut commuter dans deux sens entre un premier mode de réception audio à bande étroite (12) et un deuxième mode de réception audio standard (10). Le premier émetteur / récepteur radio portatif (60) est conçu pour fonctionner dans le premier mode de réception audio à bande étroite (12) lors de l'écoute de l'activité vocale et pour communiquer avec un deuxième émetteur-récepteur (64) via un lien de communication radio sans fil lorsqu'une activité vocale a été détectée. Le deuxième émetteur / récepteur (64) est conçu pour indiquer à un utilisateur la détection d'une activité vocale par le premier émetteur / récepteur radio (60). La détection des voix peut être optimisée pour les voix d'enfants (52), ce qui permet d'utiliser le système comme un dispositif de surveillance des bébés.
PCT/EP2003/006904 2002-08-06 2003-06-30 Moniteur audio sans fil Ceased WO2004015643A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60320428T DE60320428D1 (de) 2002-08-06 2003-06-30 Drahtlose audio- berwachungsvorrichtung
AU2003242776A AU2003242776A1 (en) 2002-08-06 2003-06-30 Wireless audio monitor
EP03783995A EP1543483B1 (fr) 2002-08-06 2003-06-30 Moniteur audio sans fil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0218267.3 2002-08-06
GB0218267A GB2391673B (en) 2002-08-06 2002-08-06 Wireless audio monitor

Publications (1)

Publication Number Publication Date
WO2004015643A1 true WO2004015643A1 (fr) 2004-02-19

Family

ID=9941843

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/006904 Ceased WO2004015643A1 (fr) 2002-08-06 2003-06-30 Moniteur audio sans fil

Country Status (6)

Country Link
EP (1) EP1543483B1 (fr)
AT (1) ATE392686T1 (fr)
AU (1) AU2003242776A1 (fr)
DE (1) DE60320428D1 (fr)
GB (1) GB2391673B (fr)
WO (1) WO2004015643A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7525440B2 (en) 2005-06-01 2009-04-28 Bose Corporation Person monitoring
US9838810B2 (en) 2012-02-27 2017-12-05 Qualcomm Technologies International, Ltd. Low power audio detection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2413208A (en) * 2004-04-13 2005-10-19 Jenny Wong Soft toy baby monitor
WO2006043193A1 (fr) * 2004-10-18 2006-04-27 Koninklijke Philips Electronics N.V. Systeme permettant de surveiller une personne
GB2456220A (en) * 2007-12-27 2009-07-15 Sarah Lucas Baby-monitoring device using wireless technology

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627996A1 (de) * 1996-07-11 1998-01-22 Philips Patentverwaltung Akustische Raumüberwachung
DE10008029A1 (de) * 2000-02-22 2001-08-30 Fritz Grunder Telefon mit Schallpegelintegration

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531115A (en) * 1982-07-26 1985-07-23 Emhart Industries, Inc. Remote alarm system
JPS6226965A (ja) * 1985-07-27 1987-02-04 Toshiba Electric Equip Corp 通話装置
US5640147A (en) * 1996-01-16 1997-06-17 Chek; Lawrence Child monitoring device
US5812056A (en) * 1997-05-09 1998-09-22 Golden Eagle Electronics Manufactory Ltd. Child locating and monitoring device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19627996A1 (de) * 1996-07-11 1998-01-22 Philips Patentverwaltung Akustische Raumüberwachung
DE10008029A1 (de) * 2000-02-22 2001-08-30 Fritz Grunder Telefon mit Schallpegelintegration

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7525440B2 (en) 2005-06-01 2009-04-28 Bose Corporation Person monitoring
US9838810B2 (en) 2012-02-27 2017-12-05 Qualcomm Technologies International, Ltd. Low power audio detection

Also Published As

Publication number Publication date
GB2391673A (en) 2004-02-11
AU2003242776A1 (en) 2004-02-25
EP1543483A1 (fr) 2005-06-22
GB2391673B (en) 2005-01-19
EP1543483B1 (fr) 2008-04-16
GB0218267D0 (en) 2002-09-11
DE60320428D1 (de) 2008-05-29
ATE392686T1 (de) 2008-05-15

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