EP0555951A1 - Haut-parleur - Google Patents

Haut-parleur Download PDF

Info

Publication number
EP0555951A1
EP0555951A1 EP93300019A EP93300019A EP0555951A1 EP 0555951 A1 EP0555951 A1 EP 0555951A1 EP 93300019 A EP93300019 A EP 93300019A EP 93300019 A EP93300019 A EP 93300019A EP 0555951 A1 EP0555951 A1 EP 0555951A1
Authority
EP
European Patent Office
Prior art keywords
loudspeaker
remote controlled
explosion
loudspeaker according
proof body
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.)
Granted
Application number
EP93300019A
Other languages
German (de)
English (en)
Other versions
EP0555951B1 (fr
Inventor
Terence William c/o East Anglian Elec. Ltd. Bain
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.)
EAST ANGLIAN ELECTRONICS Ltd
Original Assignee
EAST ANGLIAN ELECTRONICS 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 EAST ANGLIAN ELECTRONICS Ltd filed Critical EAST ANGLIAN ELECTRONICS Ltd
Publication of EP0555951A1 publication Critical patent/EP0555951A1/fr
Application granted granted Critical
Publication of EP0555951B1 publication Critical patent/EP0555951B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/30Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00Public address systems

Definitions

  • This invention relates to loudspeakers and in particular provides loudspeakers for emergency public address in remote or hazardous areas such as on off-shore oil/gas platforms and drilling rigs.
  • Loudspeakers are often used in hazardous areas to provide audible warnings as an integral part of the safety features of the area. In the event of any serious accidents or emergency procedures it is imperative that the work-force and any emergency teams can be given precise information regarding the incident and what steps must be taken such as decks to be cleared or, in the event of a serious fire, the procedure and route for the installation to be evacuated. In such circumstances it is imperative that the loudspeakers function for as long as possible in emergency conditions especially during fire as lives may be lost if such loudspeaker equipment is affected by a fire.
  • control electronics for the public address speakers are generally located in a safe area on the installation and cables are run from this area to the speakers.
  • the loudspeakers are then controlled from a remote location such as a radio room or control room.
  • the present arrangement uses large amounts of cabling which is susceptible to damage during an emergency such as an explosion or fire on deck.
  • the present invention therefore aims to overcome the disadvantages of known loudspeaker equipment and to provide a loudspeaker which will continue to function in hazardous conditions.
  • a remote controlled loudspeaker comprising a main housing, an explosion-proof body provided within the main housing and means for controlling the loudspeaker, wherein the control means are located within the explosion-proof body such that in the event of an emergency the loudspeaker may continue to be operated from a remote location.
  • Sealing means are provided to seal the explosion-proof body within the loudspeaker.
  • the sealing means may be in the form of silicone rubber O-rings and a sintered disc.
  • a loudspeaker 1 comprising a main housing 2 having a cylindrical portion 3 and a frustoconical horn portion 4.
  • the housing 2 is formed of an anti-static compound (CENELEC EN 50014-6).
  • One end 5 of the housing 2, remote from the frustoconical portion 4, is provided with a cover portion 6 which is sealed in position by a silicone rubber O-ring 7.
  • a flame-proof, explosion-proof body 8 made from aluminium alloy (DS-4261 equal to LM6) is located within the cylindrical portion 3 of the housing.
  • the body 8 extends through an aperture 9 in the main housing 2 within the horn 4 of the housing 2 and is sealed by a cork sealing gasket 10 and a silicone rubber O-ring 11 and sintered disc 17.
  • a cork sealing gasket 10 and a silicone rubber O-ring 11 and sintered disc 17.
  • the body 8 is closed by an explosion-proof enclosure cap 12 and is sealed by a further silicone O-ring 13 within the cylindrical portion 3 of the housing 2.
  • An antenna (not shown) is provided within the cover portion 6 of the housing 2.
  • a bracket 14 is fixed to the main housing 2 by a suitable fixing means such as a screw 15.
  • the loudspeaker may be mounted in any desired location.
  • the control electronics 16 for the loudspeaker are located within the explosion-proof body 8 and are described below.
  • an RF carrier set to the correct frequency is received by an RF unit 17.
  • the modulation from the receiver 17 is then passed to a processor unit 18 where it is fed to a CTCSS decoder. This is programmed for detection of one of 38 standard sub-audible tones. If a tone is detected, the audio signal is then filtered to remove any high frequency noise and passed to a mute circuit 19.
  • the mute circuit 19 ensures that in a condition of no received carrier into the receiver 17, no unwanted noise is fed to the last amplifier. From the volume control the audio signal is fed to a power amplifier which then feeds the signal to the speaker.
  • the correct DTMF sequence must be received, which upon being decoded is fed to an 8 bit Micro Controller 21. Here it is checked for validity and also checked to establish ident, as each unit has its own individual ident no. If all the above parameters are met then the MCU 21 carries out such commands as change channel on radio, adjust volume level, turn CTCSS decoder on/off, unmute speaker, and generate emergency alarms.
  • the loudspeaker 1 as described above may be operated from a remote location such as a helicopter in the area. Vital instructions may be given to personnel on the installation thus aiding evacuation from the area.
  • each loudspeaker is provided within the explosion-proof body 8 inside the individual loudspeaker housing this eliminates the requirements for lengthy 100 volt line audio transmission cables which are prone to damage in the event of an explosion or serious fire.
  • Each speaker is a "stand-alone" unit, no audio interconnection wires are necessary as with conventional systems.
  • Power to the unit may be fed via an uninterrupted power supply from the installation source or via a custom designed unit which would trickle charge from the installation mains and revert to emergency supply when the said mains supply is lost.
  • the custom UPS would be likewise explosion proof and located as close to the loudspeaker as to maximise safety.
  • the loudspeaker as described above may be located in any area where it is advantageous for public address announcements.

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Liquid Crystal (AREA)
  • Surgical Instruments (AREA)
  • Selective Calling Equipment (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Transmitters (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Steroid Compounds (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
EP93300019A 1992-02-12 1993-01-04 Haut-parleur Expired - Lifetime EP0555951B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929202865A GB9202865D0 (en) 1992-02-12 1992-02-12 Loudspeakers
GB9202865 1992-02-12

Publications (2)

Publication Number Publication Date
EP0555951A1 true EP0555951A1 (fr) 1993-08-18
EP0555951B1 EP0555951B1 (fr) 1996-10-02

Family

ID=10710183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93300019A Expired - Lifetime EP0555951B1 (fr) 1992-02-12 1993-01-04 Haut-parleur

Country Status (7)

Country Link
EP (1) EP0555951B1 (fr)
AT (1) ATE143759T1 (fr)
DE (1) DE69305097T2 (fr)
DK (1) DK0555951T3 (fr)
ES (1) ES2092754T3 (fr)
GB (1) GB9202865D0 (fr)
NO (1) NO922308L (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0822732A2 (fr) * 1996-07-23 1998-02-04 MEDC Limited Haut-parleur
WO2009141717A2 (fr) * 2008-05-21 2009-11-26 Cooper Technologies Company Eléments frittés et systèmes associés
WO2010004285A1 (fr) * 2008-07-11 2010-01-14 Cooper Medc Limited Ensemble haut-parleur anti-déflagrant
CN116233702A (zh) * 2023-01-31 2023-06-06 广州市声讯电子科技股份有限公司 一种防爆强声器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201619517D0 (en) * 2016-11-18 2017-01-04 Cooper Technologies Co Electroacoustic driver housing element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180423A2 (fr) * 1984-10-25 1986-05-07 Sieger Limited Système pour régler à distance un paramètre d'un circuit électrique à l'intérieur d'un boîtier
GB2199466A (en) * 1986-11-08 1988-07-06 G L Communications Limited Monitoring loudspeakers
US4958154A (en) * 1988-07-14 1990-09-18 Blaupunkt-Werke Gmbh System for wireless remote actuation of differing siren programs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180423A2 (fr) * 1984-10-25 1986-05-07 Sieger Limited Système pour régler à distance un paramètre d'un circuit électrique à l'intérieur d'un boîtier
GB2199466A (en) * 1986-11-08 1988-07-06 G L Communications Limited Monitoring loudspeakers
US4958154A (en) * 1988-07-14 1990-09-18 Blaupunkt-Werke Gmbh System for wireless remote actuation of differing siren programs

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0822732A2 (fr) * 1996-07-23 1998-02-04 MEDC Limited Haut-parleur
EP0822732A3 (fr) * 1996-07-23 2001-10-24 MEDC Limited Haut-parleur
WO2009141717A2 (fr) * 2008-05-21 2009-11-26 Cooper Technologies Company Eléments frittés et systèmes associés
WO2009141717A3 (fr) * 2008-05-21 2010-01-14 Cooper Technologies Company Eléments frittés et systèmes associés
US7938223B2 (en) * 2008-05-21 2011-05-10 Cooper Technologies Company Sintered elements and associated systems
WO2010004285A1 (fr) * 2008-07-11 2010-01-14 Cooper Medc Limited Ensemble haut-parleur anti-déflagrant
CN116233702A (zh) * 2023-01-31 2023-06-06 广州市声讯电子科技股份有限公司 一种防爆强声器

Also Published As

Publication number Publication date
DE69305097T2 (de) 1997-06-12
ATE143759T1 (de) 1996-10-15
DK0555951T3 (da) 1996-11-18
ES2092754T3 (es) 1996-12-01
GB9202865D0 (en) 1992-03-25
NO922308L (no) 1993-08-13
DE69305097D1 (de) 1996-11-07
NO922308D0 (no) 1992-06-12
EP0555951B1 (fr) 1996-10-02

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