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WO2003009499A3 - Listening/anti eavesdropping device - Google Patents

Listening/anti eavesdropping device Download PDF

Info

Publication number
WO2003009499A3
WO2003009499A3 PCT/GB2002/003249 GB0203249W WO03009499A3 WO 2003009499 A3 WO2003009499 A3 WO 2003009499A3 GB 0203249 W GB0203249 W GB 0203249W WO 03009499 A3 WO03009499 A3 WO 03009499A3
Authority
WO
WIPO (PCT)
Prior art keywords
vibration
transducer
information
selecting
room
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/GB2002/003249
Other languages
French (fr)
Other versions
WO2003009499A2 (en
Inventor
Martin Christopher Cassey
Graham Bank
Neil Owen
Neil Harris
Martin Colloms
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.)
NVF Tech Ltd
Original Assignee
New Transducers 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 New Transducers Ltd filed Critical New Transducers Ltd
Priority to AU2002313529A priority Critical patent/AU2002313529A1/en
Publication of WO2003009499A2 publication Critical patent/WO2003009499A2/en
Publication of WO2003009499A3 publication Critical patent/WO2003009499A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

A method and apparatus for transmitting information from a conversation in a room to a remote listener comprising selecting a structure (101) in the room which is capable of supporting vibration, selecting an electromechanical force transducer (90) which has an intended operative frequency range and comprises a resonant element (84, 86) having a frequency distribution of modes in the operative frequency range, mounting the transducer (90) to the structure (101) using coupling means (68) whereby the transducer excites vibration in the structure, positioning a sensor to detect vibration in the structure (101), determining information from the detected vibration and transmitting said information to a remote listener. There is also provided an anti-eavesdropping system which is the reverse of the method and apparatus according to the first and second aspects of the invention.
PCT/GB2002/003249 2001-07-20 2002-07-16 Listening/anti eavesdropping device Ceased WO2003009499A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002313529A AU2002313529A1 (en) 2001-07-20 2002-07-16 Listening/anti eavesdropping device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0117663.5 2001-07-20
GB0117663A GB0117663D0 (en) 2001-07-20 2001-07-20 Listening anti eavesdropping device

Publications (2)

Publication Number Publication Date
WO2003009499A2 WO2003009499A2 (en) 2003-01-30
WO2003009499A3 true WO2003009499A3 (en) 2003-07-31

Family

ID=9918840

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/003249 Ceased WO2003009499A2 (en) 2001-07-20 2002-07-16 Listening/anti eavesdropping device

Country Status (3)

Country Link
AU (1) AU2002313529A1 (en)
GB (1) GB0117663D0 (en)
WO (1) WO2003009499A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10328815A1 (en) * 2003-06-21 2005-01-05 Biotronik Meß- und Therapiegeräte GmbH & Co. Ingenieurbüro Berlin Coating system for implants to increase tissue compatibility
KR100901772B1 (en) 2007-10-08 2009-06-11 한국전자통신연구원 Devices to prevent eavesdropping through speakers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593160A (en) * 1984-03-09 1986-06-03 Murata Manufacturing Co., Ltd. Piezoelectric speaker
WO1997009842A2 (en) * 1995-09-02 1997-03-13 New Transducers Limited Acoustic device
WO2000035242A2 (en) * 1998-12-09 2000-06-15 New Transducers Limited Bending wave panel-form loudspeaker
US6114684A (en) * 1998-05-19 2000-09-05 Mc Guire; James F. Laser listening device detector
WO2001054450A2 (en) * 2000-01-24 2001-07-26 New Transducers Limited Transducer in particularly for use in acoustic devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4593160A (en) * 1984-03-09 1986-06-03 Murata Manufacturing Co., Ltd. Piezoelectric speaker
WO1997009842A2 (en) * 1995-09-02 1997-03-13 New Transducers Limited Acoustic device
US6114684A (en) * 1998-05-19 2000-09-05 Mc Guire; James F. Laser listening device detector
WO2000035242A2 (en) * 1998-12-09 2000-06-15 New Transducers Limited Bending wave panel-form loudspeaker
WO2001054450A2 (en) * 2000-01-24 2001-07-26 New Transducers Limited Transducer in particularly for use in acoustic devices

Also Published As

Publication number Publication date
WO2003009499A2 (en) 2003-01-30
GB0117663D0 (en) 2001-09-12
AU2002313529A1 (en) 2003-03-03

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