EP0555951A1 - Loudspeakers - Google Patents
Loudspeakers Download PDFInfo
- 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
Links
- 238000009434 installation Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 229920002379 silicone rubber Polymers 0.000 claims description 4
- 239000004945 silicone rubber Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 description 4
- 231100001261 hazardous Toxicity 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/30—Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public 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.
Abstract
Description
- 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.
- At present, the 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.
- According to one aspect of the present invention there is provided 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.
- One embodiment of the present invention will be described with reference to and as shown in the accompanying drawings, in which:
- FIGURE 1 is a side view of a loudspeaker according to one aspect of the present invention;
- FIGURE 2 is a schematic view of one embodiment of control electronics for the loudspeaker of FIGURE 1, and
- FIGURE 3 is a schematic view of a further embodiment of control electronics for the loudspeaker of FIGURE 1.
- Referring now to the figures there is described a
loudspeaker 1 comprising amain housing 2 having acylindrical portion 3 and afrustoconical horn portion 4. Thehousing 2 is formed of an anti-static compound (CENELEC EN 50014-6). Oneend 5 of thehousing 2, remote from thefrustoconical 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 thecylindrical portion 3 of the housing. Thebody 8 extends through an aperture 9 in themain housing 2 within thehorn 4 of thehousing 2 and is sealed by acork sealing gasket 10 and a silicone rubber O-ring 11 and sintereddisc 17. At the other end of thehousing 2 thebody 8 is closed by an explosion-proof enclosure cap 12 and is sealed by a further silicone O-ring 13 within thecylindrical portion 3 of thehousing 2. - An antenna (not shown) is provided within the cover portion 6 of the
housing 2. Abracket 14 is fixed to themain housing 2 by a suitable fixing means such as ascrew 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. - As shown in Figure 2, an RF carrier set to the correct frequency is received by an
RF unit 17. The modulation from thereceiver 17 is then passed to aprocessor 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 amute circuit 19. Themute circuit 19 ensures that in a condition of no received carrier into thereceiver 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. - In an enhanced version of the control electronics as shown in figure 3, after the signal is passed through the
mute circuit 19 it is fed to an electronic volume control and a DTMF receiver 20 (or decoder). - To enable the audio paths in this embodiment, 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 theMCU 21 carries out such commands as change channel on radio, adjust volume level, turn CTCSS decoder on/off, unmute speaker, and generate emergency alarms. - When the audio path has been opened by the MCU 21 then the speech is fed to the power amplifier which then feeds the speaker.
- It can be appreciated that in the event of an emergency such as a fire or explosion 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. - Furthermore, as the control electronics for each loudspeaker are 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.
- It is to be understood that the loudspeaker as described above may be located in any area where it is advantageous for public address announcements.
Claims (8)
- 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.
- A remote controlled loudspeaker according to claim 1, wherein sealing means are provided to seal the explosion-proof body within the loudspeaker housing.
- A remote controlled loudspeaker according to claim 2, wherein the sealing means comprises a plurality of silicone-rubber o-rings and a sintered disc.
- A remote controlled loudspeaker according to any one of claims 1,2 or 3, wherein power is supplied via an uninterrupted power supply from the installation source.
- A remote controlled loudspeaker according to any one of the preceding claims, wherein the control means comprises an RF unit, a processor unit, a decoder, the decoder being set for detection of one of a number of signals, and an amplifier for amplifying the signal.
- A remote controlled loudspeaker according to claim 5, wherein the control means further comprises a filter and a mute circuit ensuring no unwanted noise is fed to the amplifier.
- A remote controlled loudspeaker according to claim 6, wherein the control means further comprises a volume control unit, a decoder and means for checking the validity and identity of a signal .
- A remote controlled loudspeaker according to claim 7, wherein the means for checking the validity and identity of the signal comprises a micro controller.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9202865 | 1992-02-12 | ||
GB929202865A GB9202865D0 (en) | 1992-02-12 | 1992-02-12 | Loudspeakers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0555951A1 true EP0555951A1 (en) | 1993-08-18 |
EP0555951B1 EP0555951B1 (en) | 1996-10-02 |
Family
ID=10710183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93300019A Expired - Lifetime EP0555951B1 (en) | 1992-02-12 | 1993-01-04 | Loudspeakers |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0555951B1 (en) |
AT (1) | ATE143759T1 (en) |
DE (1) | DE69305097T2 (en) |
DK (1) | DK0555951T3 (en) |
ES (1) | ES2092754T3 (en) |
GB (1) | GB9202865D0 (en) |
NO (1) | NO922308L (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0822732A2 (en) * | 1996-07-23 | 1998-02-04 | MEDC Limited | Loud Speaker |
WO2009141717A2 (en) * | 2008-05-21 | 2009-11-26 | Cooper Technologies Company | Sintered elements and associated systems |
WO2010004285A1 (en) * | 2008-07-11 | 2010-01-14 | Cooper Medc Limited | Explosion-proof speaker assembly |
CN116233702A (en) * | 2023-01-31 | 2023-06-06 | 广州市声讯电子科技股份有限公司 | Explosion-proof sound amplifier |
Families Citing this family (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0180423A2 (en) * | 1984-10-25 | 1986-05-07 | Sieger Limited | A system for remotely adjusting a parameter of an electrical circuit within an enclosure |
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 |
-
1992
- 1992-02-12 GB GB929202865A patent/GB9202865D0/en active Pending
- 1992-06-12 NO NO92922308A patent/NO922308L/en unknown
-
1993
- 1993-01-04 DE DE69305097T patent/DE69305097T2/en not_active Expired - Fee Related
- 1993-01-04 AT AT93300019T patent/ATE143759T1/en not_active IP Right Cessation
- 1993-01-04 EP EP93300019A patent/EP0555951B1/en not_active Expired - Lifetime
- 1993-01-04 DK DK93300019.2T patent/DK0555951T3/en active
- 1993-01-04 ES ES93300019T patent/ES2092754T3/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0180423A2 (en) * | 1984-10-25 | 1986-05-07 | Sieger Limited | A system for remotely adjusting a parameter of an electrical circuit within an enclosure |
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0822732A2 (en) * | 1996-07-23 | 1998-02-04 | MEDC Limited | Loud Speaker |
EP0822732A3 (en) * | 1996-07-23 | 2001-10-24 | MEDC Limited | Loud Speaker |
WO2009141717A2 (en) * | 2008-05-21 | 2009-11-26 | Cooper Technologies Company | Sintered elements and associated systems |
WO2009141717A3 (en) * | 2008-05-21 | 2010-01-14 | Cooper Technologies Company | Sintered elements and associated systems |
US7938223B2 (en) * | 2008-05-21 | 2011-05-10 | Cooper Technologies Company | Sintered elements and associated systems |
WO2010004285A1 (en) * | 2008-07-11 | 2010-01-14 | Cooper Medc Limited | Explosion-proof speaker assembly |
CN116233702A (en) * | 2023-01-31 | 2023-06-06 | 广州市声讯电子科技股份有限公司 | Explosion-proof sound amplifier |
Also Published As
Publication number | Publication date |
---|---|
DE69305097D1 (en) | 1996-11-07 |
DE69305097T2 (en) | 1997-06-12 |
NO922308L (en) | 1993-08-13 |
DK0555951T3 (en) | 1996-11-18 |
ATE143759T1 (en) | 1996-10-15 |
GB9202865D0 (en) | 1992-03-25 |
EP0555951B1 (en) | 1996-10-02 |
NO922308D0 (en) | 1992-06-12 |
ES2092754T3 (en) | 1996-12-01 |
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