EP1802175A1 - Vorrichtung zur Schallaufzeichnung und Schiff, das diese Vorrichtung umfasst - Google Patents

Vorrichtung zur Schallaufzeichnung und Schiff, das diese Vorrichtung umfasst Download PDF

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Publication number
EP1802175A1
EP1802175A1 EP06126411A EP06126411A EP1802175A1 EP 1802175 A1 EP1802175 A1 EP 1802175A1 EP 06126411 A EP06126411 A EP 06126411A EP 06126411 A EP06126411 A EP 06126411A EP 1802175 A1 EP1802175 A1 EP 1802175A1
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EP
European Patent Office
Prior art keywords
line
module
sound
interruption
modules
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
EP06126411A
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English (en)
French (fr)
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EP1802175B1 (de
Inventor
Thierry Albert
Patrick Dufresne
Guillaume Guennec
Vincent Pinto
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.)
STX France SA
Original Assignee
Aker Yards SA
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Publication date
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Publication of EP1802175A1 publication Critical patent/EP1802175A1/de
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Publication of EP1802175B1 publication Critical patent/EP1802175B1/de
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B45/00—Arrangements or adaptations of signalling or lighting devices
    • B63B45/08—Arrangements or adaptations of signalling or lighting devices the devices being acoustic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J99/00—Subject matter not provided for in other groups of this subclass
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/007—Monitoring arrangements; Testing arrangements for public address systems

Definitions

  • the invention relates to a system or device for the sound of a ship.
  • the vessels concerned may be of any type: passenger ships, such as, for example, ferries, cruise ships or other vessels, cargo vessels or merchant vessels.
  • a public address system is called a public address system. It includes audio amplifiers supplying loudspeaker networks with audio signals to broadcast on the ship for example alarms (fire, general), voice announcements, music.
  • slice bridges each of which represents the space between two decks of the ship and two fire slices of the ship, a bridge signifying a level in height, and a slice a firewall in the vertical direction.
  • Shipborne sound devices are safety systems that must comply with a regulation, IMO - MSC - Circular 808, according to which the sound system must consist of at least two fire retardant cable loops, which loops must be sufficiently separated along their length and to be powered by two independent and separate amplifiers.
  • a first half of the speakers is sounded by a first amplifier via a network A and the second half of the speakers is sounded by a second separate amplifier via a network B.
  • All the cables used to connect the speakers to their associated amplifier are at least fire retardant.
  • the speakers are distributed along the length of the corridor being alternately connected to the first amplifier and the second amplifier. This alternation is also found in the cabin speakers or any other public or technical premises.
  • an amplifier can power several slice decks.
  • each amplifier on the same bridge-slice, serves the same premises so that in case of problems on a network, the second continues to supply all the premises and thus the security system continues to be active.
  • This architecture has many disadvantages.
  • each bridge-slice two lengths of cable are needed to connect the speakers to the two amplifiers.
  • redundant network cables A and B travel together in the same cable trays.
  • both networks A and B serving the area and therefore complete loss of the broadcast alarms in the area covered by the two networks, that is to say say on several decks and slices of the ship.
  • fire-resistant cables are expensive compared to fire retardant cables and are more difficult to mount than these.
  • PA network aboard a ship is the largest consumer of cables (about 150 km for a 1000-cabin passenger ship), and this is a complex architecture because of the two redundant networks A and B which leads to material costs, studies, assembly and important tests.
  • the BV regulation indicates that fire - resistant cables can be dispensed with if the safety system is self - controlled, secured in the event of a fault or duplicated with separate cable glands as much as possible (BV Part C rule, Chap 2, Sec 3, page 9.6.1).
  • the document EP-A-967 833 describes a public address system in a building, providing an amplifier for providing the audio signal from both ends of two cables to the different sections in which the loudspeakers are located. Insulator circuits are provided to detect short circuit and open circuit faults and provide isolation if a fault is detected.
  • this system does not comply with the above mentioned regulations for ships with respect to the two independent and separate amplifiers.
  • this system presents a risk that is too high in the event of a fault on the amplifier, since in this case the entire network could be lost and the insulators provided between the sections would no longer be powered and would not send any more information. default.
  • the invention aims to overcome the drawbacks of the state of the art and to provide a sound device on board a ship, which complies with the safety regulations specific to ships, which makes it possible to reduce the length of cable used, which avoids the need for systematic use of fire-resistant cables and is easy and economical to install on board a large vessel.
  • a first object of the invention is a sound device of a ship, the device comprising two sound amplifiers of a plurality of loudspeakers, characterized in that the two amplifiers are connected head to tail at both ends of a sound line serving the speakers.
  • a second object of the invention is a sound line control module, the module being intended to be mounted in a sound line serving loudspeakers, the sound line to be connected at both ends to two amplifiers. sound system upside down, the module comprising at least one means of interrupting the line, characterized in that the line control module comprises at least one fault detection means on the line, connected to a control means for causing the interruption means to open in the absence of fault detection and closure. interrupt means in the presence of fault detection.
  • This line control module comprises for example at least one output port to allow the feedback of the module information to the outside, which may be the sending of an error message to the outside in case of detection of 'failure.
  • the output port (s) of the line control module and / or the short-circuit and cutoff management modules are for example connected to one or more control systems distributed in the ship (for example, Safety Management System).
  • a third subject of the invention is a vessel comprising a plurality of bridge-slices provided with loudspeakers and at least one sound device as described above, serving at least a part of the loudspeakers of at least one loudspeaker. set of bridge-slices.
  • Each bridge-slice comprises a plurality of speakers HP, which are for example connected in parallel to the same branch BR shown in dashed line.
  • a bridge-slice may comprise several branches BR to each of which are connected one or more speakers HP.
  • a bridge-slice may also have only one HP speaker.
  • FIG. 1 assumes that several adjacent slices and / or bridges each have a branch BR of several HP loudspeakers, namely the slice bridges of slices 4 and 5 and the N-1, N, N + 1 bridges and N + 2 as shown.
  • a greater or lesser number of such bridge-slices could be provided.
  • the branches BR of loudspeakers HP are connected by nodes NO to the same line L of sound, passing successively in the different adjacent slice bridges in which these HP speakers are located.
  • a first end EL1 of the line L is connected to the output 11 of a first amplifier 1, while the second end EL2 of the line L, remote from the first end EL1, is connected to the output 12 of a second amplifier 2.
  • the first and second amplifiers 1, 2 are located in two slice bridges distant from each other, that is to say non-adjacent.
  • An interrupting and closing means 71 forming part of a line control module 7, is provided on the path of the line L, between its two ends EL1 and EL2.
  • This line control module 7 is also called a line-to-line controller.
  • the amplifiers 1 and 2 provide by their output 11, 12 on both ends EL 1 and EL 2 of the line L the audio signal to be routed to the speakers HP, and a pilot signal, which is a signal having a spectrum above the audio spectrum, this pilot signal having for example a frequency of 20 kHz.
  • the output 11, 12 of the amplifiers 1, 2 comprises a controller adding the pilot signal to the audio signal.
  • This pilot signal allows the modules 7, 8 described below to identify whether or not they receive the audio signal.
  • Line L is self-controlled by modules 7 and 8 for reconfiguration and signaling in the event of a fault on line L.
  • the sound line L is represented by two distinct conductors L1, L2, and the interruption means 71 is formed by a relay comprising two switches 72 and 73, which are provided on the two conductors L 1 and L 2. respectively and which are controlled in the same open or closed position by a control input 74.
  • the switch 72 of the driver L1 and the switch 73 of the driver L2 share the line L in two straight parts LD and left LG in the module 7, the left side being taken with reference to the amplifier 1, and the right side being
  • the module 7 comprises a first detector 75 of the pilot signal, which is connected to the line L on the left side of the switches 72, 73, and a second detector 76 of the pilot signal, which is connected to the line L on the side
  • the detectors 75 and 76 are connected to a CPU central unit able to control the position of the switches 72 and 73.
  • the module 7 furthermore comprises a supply line V of the module 7 in electrical energy, comprising two supply conductors V1 and V2, as well as an emergency supply circuit 77, for storing electrical energy in the power supply. case where the supply of line V is faulty.
  • the circuit 77 comprises for example a first diode 771 connected to the left side of the supply conductor V2 of the line V, a second diode 772 connected to the right side of the same supply conductor V2 by the same anode or cathode terminal as the first diode 771, while the other terminal, cathode or anode of the diodes 771 and 772 is connected to a general power supply PSU network of the module 7 and to the first terminal of a series RC circuit, whose second terminal is connected to the power supply conductor V1.
  • the line control module 7 further comprises a third supply presence detector 85 connected on the left side of the two conductors V1 and V2, and a fourth supply presence detector 86, connected on the right side of the V1 conductors. and V2.
  • a switch 78 On the conductor V2, between the diodes 771 and 772 and between the left and right sides, is interposed a switch 78, whose position is controlled by an input 79 of the CPU.
  • control module 7 of the line L is as follows.
  • both the detector 75 and the detector 76 detect on the right and left side the presence of the pilot signal on the line L, which results in the fact that they each provide a logic signal 1 to the central unit.
  • the latter controls the input 74 to maintain the switches 72 and 73 in the open position to cut from one another the two right and left sides of the line L.
  • the right side LD of the line L feeds all the loudspeakers HP and branch BR which it encounters, namely in FIG. 1 the loudspeakers HP located in the slice 4, the line control module 7 located on the section of the line L, connecting the slice 4 to the slice 5 in the bridge N-1, while the first amplifier 1 feeds the left side LG of the line L and all the speakers HP and branch BR encountered on this left side, stopping at the module 7.
  • the detector 75 or the detector 76 supplies a logic signal 0 to the central processing unit CPU, which then commands the closing of the two switches 72 and 73 to interconnect with each other. the two right sides LD and left LG of the line L, as will be described in more detail below.
  • modules 8 short circuit management and cutoff in order to isolate a defect appearing on the line L.
  • the modules 8 management short- circuit and cut are for example identical to each other and the device has a distributed architecture.
  • a short-circuit management module 8 and cut is for example associated with each BR branch of HP speakers and / or each bridge-slice.
  • the node NO is located on a section of the line L, which is located between two successive management modules 8.
  • the short-circuit management and cut-off modules 8 are also called intermediate modules 8 and the line control module 7 is for example called the central module 7, although there is not necessarily the same number of modules 8 short circuit and cutoff management on the right and left sides of the line control module 7.
  • management modules 8 there are for example several management modules 8 along the left side LG of the line L between the first end EL1 and the module 7, and several management modules 8 on the right side of the line L, between the second end EL2 and the module 7.
  • the short-circuit management and cut-off modules 8 have a structure similar to that of the line control module 7, but with a different control of the switches 72, 73 and 78.
  • the central processing unit CPU keeps the switches 72 and 73 closed, in order to connect the two right and left sides of the line L to each other at the level of this module 8.
  • both the detector 75 and the detector 76 of a short-circuit and cut-off management module 8 do not detect the pilot signal on their left and right sides with respect to the switches 72 and 73, they do not detect the pilot signal on their left and right sides with respect to the switches 72 and 73. each send a logic signal 0 to the CPU, which then controls the opening of the switches 72 and 73, in order to disconnect the right and left sides of the line L at the level of this module 8.
  • each module 8 for short-circuit management and cut-off can have self-test means to ensure the life and proper operation of the module and report a fault in case of partial or total failure.
  • This self-test is for example autonomous, in the sense that each module is able to test all of its malfunction states, or is based on a distributed architecture, in the sense that the modules test each other.
  • a junction box BJ is provided in every other half-bridge and includes two modules 8 for short-circuit management and cut-off, respectively managing the speakers HP of the bridge-slice (N) - 5 which houses this BJ housing and the HP speakers of an adjacent slice bridge (N-1) - free of BJ housing.
  • the node (s) NO1 for connection to the loudspeakers HP and branch (s) BR are (are) between the two modules 8 of the housing BJ, while for the bridge-slice (N-1) - 5, the node (s) NO2 connecting to the speakers HP and branch (s) BR is (are) not between the two modules 8 of the housing BJ.
  • the module 7 is provided in a BJ7 housing separate from the other BJ boxes.
  • Each short-circuit management and cutoff module 8 can be integrated with an associated HP speaker.
  • FIGS. 3 to 8 00, 01, 10 and 11 indicate the detection state communicated by respectively the left detector 75 and the right detector 76 in FIG. the modules 8 and the module 7.
  • the branches BR and the loudspeakers HP were deliberately omitted, although present.
  • the pilot signal is detected by the line control module 7 and by all the short-circuit and cutout management modules 8 on each of their two right-hand and left-right sides. LG of the line L. Therefore, the module 7 and the modules 8 are each in the detection state 11, and therefore the switches 72, 73 of the control module 7 are open and the switches 72, 73 of the modules 8 of FIG. management are closed.
  • the audio signal and the pilot signal are supplied by the amplifier 1 and are transmitted by the closed management modules A1 to A7 of the line L to the various branches BR and speakers HP encountered to the left side of the control module 7 .
  • the audio signal and the pilot signal are also supplied by the other amplifier 2 and are transmitted by the management modules B1 to B7 closed on the right side LD of the line L to the various branches BR and speakers HP encountered until right side of control module 7.
  • FIGS. 4A to 41 represent the operation of the module 7 and the modules 8 in the case where a short circuit CC appears on the line L, on the section going from the management module A5 to the management module A6.
  • the invention also relates to a control method of the device according to the invention.
  • the module 7 comprises a switch 91 having a central access 94 adapted to switch between a first port 92 connected to a fault signaling conductor 62 and a second port 93 connected to a signaling conductor 63. normal state of no fault.
  • the central access 94 is connected to another conductor 64.
  • the leads 62, 63, 64 are connected to an external control unit, for example located in a remote control room.
  • the absence of ERR error signal on the output port 90 keeps the switch 91 in the position connecting the central access 94 to the access 93 to connect the lead 64 to the lead 63, and thus signal a normal state to this outdoor unit.
  • the presence of ERR error signal on the output port 90 makes the switch 91 in the position shown in Figure 2, connecting the central access 94 to the access 92 to connect the conductor 64 to the conductor 62, and report thus a fault to this outdoor unit.
  • the modules A1 to A7 having their detectors 75 and 76 at the state 00 for detecting the absence of the pilot signal, open.
  • the central module 7 closes its switches 72 and 73, following the sending of the error signal ERR.
  • the module 7 receives on both its right and left sides the audio signal and the pilot signal from the amplifier 2, so that its detectors 75 and 76 go to 1.
  • the module 7 then transmits the pilot signal to the module A7 .
  • the right detector 76 of the management module A7 connected by the line L to the right side of the central module 7, goes to 1, because the pilot signal is then transmitted from the amplifier 2 via the central module 7.
  • No more BR branches and HP speakers on the left side LG of the line L is then fed audio signal or pilot signal to the module A7, due to the opening of the A1 to A7 modules.
  • the audio signal and the pilot signal are sent from the amplifier 1 to the left side of the management module A1, which switches its detector 75 from left to 1.
  • the management modules A1 and A7 observing that one of their detectors 75 and 76, namely the left detector 75 of A1 and the right detector of A7, is in the 1 state of presence of the pilot signal and that the other detector, namely the right detector 76 of A1 and the left detector of A7 is in the 0 state of absence of the pilot signal, close their switches 72 and 73, which feeds audio signal and pilot signal the following line section A1-A2 from the amplifier 1 and As7-A6 from the amplifier 2. Therefore, the modules A2 and A6 each go to the state 1 0.
  • the module A5 because it is in state 10, closes. Due to this closure, it connects to the DC short circuit which then propagates to the modules A4, A3, A2 and A1 closed up to the amplifier 1, which makes them pass to the detection state 00. absence of the pilot signal.
  • the module A5 is then kept open in the state 10, which isolates the short circuit CC on the line section A5-A6.
  • the short circuit DC is isolated by a management module 8 on each side.
  • the system then operates in degraded mode.
  • the time T1 is estimated at about five seconds and the time ⁇ t at about one second.
  • the central module 7 sends an error signal ERR to the outdoor unit.
  • This error message ERR is also permanently sent to FIGS. 5B to 5E.
  • the control module 7 closes, which makes it go to state 11 and re-feeds into an audio signal and as a pilot signal the line section 7-A7 by the amplifier 2 via the closed modules B1-B7.
  • the open module A7 then goes to the detection state of the pilot signal on the right side.
  • the module A7 noting that its right and left detectors remain in the state 1 of the presence of the pilot signal, remains in the closed state, thus noting that it does not propagate a fault.
  • the open module A6 then changes to state 10.
  • the amplifier 1 no longer provides an audio signal or a pilot signal, which puts all the modules A1 to A7 of the left part LG of the line L. in the 00 state.
  • the open control module 7 therefore no longer detects the pilot signal on the left and therefore goes to state 10.
  • This ERR error message is also permanently sent to FIGS. 6C to 6G.
  • Amplifier 1 also sends an ERR error message through a corresponding output to the outside in FIGS. 6B-6G.
  • the management module A7 observing that it is open with a state 1 of presence of the pilot signal on one side and a state 0 of absence of the pilot signal on the other side, closes, which propagates the audio signal and the pilot signal in line section A7-A6 and switches module A7 to state 11 and module A6 to state 10.
  • the entire line L is short-circuited by the closed modules, which causes them all to go to state 00 of absence detection of the pilot signal.
  • the module A1 noting that its closing has not restored on both sides the pilot signal, reopens and is kept in this open state, which re-trains the line L audio signal and pilot signal by the amplifier 2 and the other closed modules, up to the right side of module A1 in the state shown in FIG. 6F.
  • the entire line L with the exception of the section 1-A1, is supplied with audio signal and pilot signal by the amplifier 2 via the closed modules B1 to B7, 7 and A2 to A5.
  • the module A1 notes that its closure restores both sides the pilot signal and goes to 11. It remains closed.
  • the entire line L, up to the amplifier 1 is supplied with audio signal and pilot signal by the amplifier 2 via the closed modules B1 to B7, 7 and A2 to A5.
  • the module A3 In the case where this failure of the module A3 is a short circuit between its right and left sides or in the case where the fault is a blockage of its switches 72 and 73 in the closed position, the module A3 is out of order, sides right and left connected and then becomes transparent for the rest of the line L. In these cases, the line sections A2-A3 and A3-A4 are still connected together by the module A3 and then behave as a single section between A2 and A4. The protection is therefore always active but concerns a single section on two bridge decks between A2 and A4, instead of one.
  • the A3 module sends a ERR error message to the outside through its output port 90.
  • the system is reconfigured as in the case of a short circuit.
  • the failure of the module A3 is an open circuit between its two right and left sides or in the case where the failure of the module A3 is a blockage of its switches 72 and 73 in the open position, it is a cut of the line L at the level of the module A3, which is treated as an open circuit CO according to the process of FIGS. 5A to 5E.
  • the module A3 sends an ERR error message to the outside via its output port 90 and the system remains in the state.
  • control module 7 and the short-circuit management and cut-off modules 8 can also be active on the power supply line V, as shown in FIG. 9, where the branches BR and the loudspeakers HP speakers have been purposely omitted, although present.
  • the power supply line V has a first end EV1 connected to a first power supply unit 101 and a second energy end EV2 connected to a second energy supply unit 102. These supplies are a DC voltage, for example 24 volts.
  • the left feed detector 85 and the right feed detector 86 and the switch 78 interposed in each module 7, 8 on the supply line V operate in the same manner as the detectors 75 and 76 and the switches 72 and 73 on the line L to treat the short circuits, the open circuits of the line L, as well as the failures of the power supplies 101 and 102 and the modules 8 at the line V supply.
  • the states indicated correspond to those of the detectors 85 and 86, each of which can take a state 1 of detection of presence of power supply between the conductors V1 and V2 and a state 0 of detection of the absence of power supply between the conductors V1 and V2.
  • the switches 78 of the management modules 8 are closed and the switch 78 of the control module 7 is open. Therefore, in this normal state, all the sensors 85, 86 for supplying the modules 8 and the module 7 are in the 11 state of detection of the supply of the two right and left sides.
  • the line control module 7 Due to the interruption of the power supply of the line V, the line control module 7 is reset by opening its switches 72 and 73 provided on the line L and the modules 8 of short circuit management and cut resets by closing their switches 72 and 73 on the line L, the line control module 7 and the short circuit and cutoff management modules 8 then being supplied with energy to do this by the capacitor C of the supply circuit 77 emergency services discharging on their PSU network of general power supply.
  • each module 7, 8 executes a reset algorithm to check whether its detectors 75, 76 detects the presence of the pilot signal on each side. If yes, line L is and remains in the normal state shown in Figure 3.
  • each restart of the power supplies 101 and 102 causes the passage of the public address line L to the reset state of FIG. 3.
  • a branch CB controller may be set up at the termination of each speaker branch BR HP, remote from the link node NO to the line V, to control the power supply in each of these BR branches.
  • These branch CB controllers have a structure analogous to that of the modules 8 of FIG. 2 for detecting the pilot signal by their detectors 75 and 76 connected to the branch BR.
  • a fault on the branch BR such as for example a cut or a short circuit
  • the detector 75 and 76 which in this case goes to the detection state 0. absence of pilot signal.
  • the CPU unit of the branch CB controller then sends in response an ERR error signal to the outdoor unit with location for action.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Alarm Systems (AREA)
EP06126411A 2005-12-21 2006-12-18 Vorrichtung zur Schallaufzeichnung und Schiff, das diese Vorrichtung umfasst Not-in-force EP1802175B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0513046A FR2895203B1 (fr) 2005-12-21 2005-12-21 Dispositif de sonorisation et navire comportant le dispositif

Publications (2)

Publication Number Publication Date
EP1802175A1 true EP1802175A1 (de) 2007-06-27
EP1802175B1 EP1802175B1 (de) 2011-03-02

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Country Link
EP (1) EP1802175B1 (de)
JP (1) JP4966641B2 (de)
KR (1) KR20070066900A (de)
DE (1) DE602006020396D1 (de)
FR (1) FR2895203B1 (de)

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NL2006469C2 (en) * 2011-03-25 2012-09-26 Astrea Intellectueel Eigendomsrecht B V Isolator device for passing through a signal.
WO2012134273A1 (en) * 2011-03-25 2012-10-04 Astrea Intellectueel Eigendomsrecht B.V. Isolator device for passing through a signal
EP2884773A1 (de) * 2013-12-10 2015-06-17 Televic Rail NV Beschallungsanlage
US9197339B2 (en) 2011-03-25 2015-11-24 Astrea Intellectueel Eigendomsrecht B.V. Isolator device for passing through a signal

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KR101651084B1 (ko) * 2014-07-07 2016-08-26 주식회사에프지일렉트릭 고장진단모듈을 탑재한 선박용 방송시스템 및 고장진단 방법
CN105472524A (zh) * 2014-09-10 2016-04-06 神讯电脑(昆山)有限公司 扬声器的高温寿命测试装置
KR101674815B1 (ko) 2015-07-07 2016-11-09 김홍기 Ip 기반의 원격 제어식 해양 구조물 및 선박용 방송 시스템
KR20170017961A (ko) 2017-01-31 2017-02-15 김홍기 원격 제어식 해양 구조물 및 선박용 모니터링 시스템

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FR2895203B1 (fr) 2008-02-29
KR20070066900A (ko) 2007-06-27
FR2895203A1 (fr) 2007-06-22
DE602006020396D1 (de) 2011-04-14
JP2007221767A (ja) 2007-08-30
JP4966641B2 (ja) 2012-07-04
EP1802175B1 (de) 2011-03-02

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