CN116744149B - Network broadcast intercom system - Google Patents
Network broadcast intercom system Download PDFInfo
- Publication number
- CN116744149B CN116744149B CN202310788173.3A CN202310788173A CN116744149B CN 116744149 B CN116744149 B CN 116744149B CN 202310788173 A CN202310788173 A CN 202310788173A CN 116744149 B CN116744149 B CN 116744149B
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- plate
- microphone
- terminal
- spring
- sound box
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- 210000001503 joint Anatomy 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 12
- 239000000428 dust Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
- H04Q5/24—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
-
- 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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
-
- 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
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Telephone Set Structure (AREA)
Abstract
The invention provides a network broadcasting intercom system which comprises a paging microphone, a host unit and a plurality of intercom terminals, wherein each intercom terminal comprises a sound box, a fixing component, an adjusting mechanism, a guide support and a terminal microphone, the top of the guide support is provided with the fixing component, the bottom of the fixing component is provided with the sound box, the bottom of the sound box is provided with the adjusting mechanism, the adjusting mechanism comprises a top plate and a bottom plate, the side edge of the bottom plate is provided with the terminal microphone, each intercom terminal of the network broadcasting intercom system is supported by the guide support at the rear, the specific installation height of each sound box part can be controlled, the influence of sound box vibration on installation firmness can be reduced by the adjusting mechanism at the bottom in any height, the sound box and the microphone part in each intercom terminal are separately arranged, the on-off function is realized manually, and the microphone is prevented from being blocked by external dust.
Description
Technical Field
The invention relates to the field of broadcasting systems, in particular to a network broadcasting intercom system.
Background
The network intercom broadcasting system is a new generation of IP network voice intercom product, which adopts the leading VOIP technology to convert the analog audio signal into the digital signal and carries out bidirectional transmission on the local area network and the wide area network. The problems of poor stability, unclear voice effect, echo, noise, howling and the like of the traditional intercom system are solved, and the intercom system is widely applied to public places such as schools, hospitals, office buildings and the like.
The network broadcasting intercom system in the prior art is generally composed of an independent host unit and a plurality of intercom terminals, each intercom terminal comprises a sound box and a microphone, the microphone is directly arranged on the sound box and directly fixed on a support through screws, and vibration is generated when the sound box is used, so that the screws are loosened after the conventional connection mode is used for a long time, the stability of the sound box during installation is reduced, the microphone is also easily blocked by dust after being exposed to the outside for a long time, and meanwhile, the influence of the installation height of the sound box is received, so that the quality of the sound receiver is reduced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a network broadcasting intercom system so as to solve the problems in the background art.
In order to achieve the above object, the present invention is realized by the following technical scheme: the utility model provides a network broadcasting intercom system, this intercom system includes paging microphone, host computer unit and a plurality of intercom terminal, intercom terminal includes audio amplifier, fixed subassembly, adjustment mechanism, direction support and terminal microphone, fixed subassembly is installed at the top of direction support, the audio amplifier is installed to the bottom of fixed subassembly, the bottom of audio amplifier is provided with adjustment mechanism, adjustment mechanism includes roof and bottom plate, terminal microphone is installed to the bottom side of bottom plate, the lift groove has been seted up to the inboard of direction support, the inboard of lift groove is all inlayed at the both ends of roof and bottom plate, the spring bar is installed at the top of roof, and the rear end of audio amplifier is inserted at the top of spring bar, limit stop is installed to the inboard bottom welding of direction support.
Further, the ejector rod is welded and installed at the bottom of the top plate, threaded columns are inserted in the middle of the bottom plate, the wire pipes are arranged on the two sides of the bottom plate, the signal wires connected with the terminal microphones penetrate through the wire pipes, and plugs are arranged at the tops of the wire pipes.
Further, the surface of screw thread post is provided with splint, adjust knob is installed to the bottom of screw thread post, splint centre gripping respectively in the both sides of bottom plate, screw thread post upwards passes from the intermediate position of roof.
Further, the terminal microphone comprises a lifting sleeve and a microphone, a jack is formed in the surface of the bottom plate, the lifting sleeve is arranged at the bottom of the jack, the microphone is arranged on the inner side of the lifting sleeve, and the top of the microphone is connected with a first spring.
Further, the bottom of microphone is installed and is sealed the end plate, and seals the end plate and presses the bottom at lift sleeve through the effect of first spring, the microphone passes through electric wire and plug part electric connection.
Further, an inner convex ring is arranged on the inner wall of the lifting sleeve, the top of the first spring is fixedly connected with the bottom of the inner convex ring, and the central axis of the ejector rod coincides with the central axis of the jack.
Further, the surface of audio amplifier is provided with the shell, the top fixed plate is installed at the rear end top of shell, fixed subassembly includes mount and butt joint board, butt joint board welded mounting is in the bottom of mount, the screw hole has all been seted up on the surface of top fixed plate and butt joint board.
Further, the fixing frame is fixedly arranged on the side edge of the guide bracket by using screws, and two ends of the top fixing plate and the butt joint plate are attached to the inner wall of the guide bracket.
Further, the screw sleeve is installed at the top of spring rod, the surface cover of spring rod is equipped with the second spring, and the top of second spring and screw sleeve's bottom fixed connection, the bottom of second spring and the fixed surface connection of roof.
Further, the top fixing plate and the butt plate sequentially penetrate through the two threaded holes through bolts and then are embedded into the threaded sleeve.
The invention has the beneficial effects that:
1. this network broadcasting intercom system every intercom terminal all supports through the direction support at rear, cooperatees through the fixed subassembly at direction support and top, can control the concrete installation height of every audio amplifier part, and installation height is adjustable, and in the arbitrary height can reduce the influence that vibration that produces when the audio amplifier uses to the installation fastness.
2. The loudspeaker box and the microphone part in each intercom terminal are separately arranged in the network broadcasting intercom system, the connection state of the microphone and the intercom terminal part can be controlled through the manual control and adjustment mechanism, the on-off function is further realized, the microphone can be shielded through the lifting sleeve at the bottom when not used, and the microphone is prevented from being blocked by external dust.
3. This network broadcasting intercom system uses fixed subassembly to connect fixedly with the audio amplifier with direction support part, connects the fixed subassembly part at top through the second spring of bottom, can support inside screw thread sleeve part when dismantling to the separation is dismantled with fixed subassembly and audio amplifier part to the efficient.
Drawings
Fig. 1 is a schematic diagram of a network broadcast intercom system of the present invention;
fig. 2 is a schematic structural diagram of an intercom terminal part of a network broadcasting intercom system of the present invention;
fig. 3 is a schematic structural diagram of an adjusting mechanism of a network broadcasting intercom system according to the present invention;
fig. 4 is a schematic structural diagram of a terminal microphone part of a network broadcasting intercom system of the present invention;
FIG. 5 is an installation diagram of a fixed component part of a network broadcast intercom system of the present invention;
fig. 6 is a block diagram of the bottom of a guide bracket of the network broadcasting intercom system of the present invention;
in the figure: 1. a host unit; 2. paging microphones; 3. a switch; 4. an intercom terminal; 5. a sound box; 6. a terminal microphone; 7. a guide bracket; 8. an adjusting mechanism; 9. a fixing assembly; 10. a bottom plate; 11. a threaded column; 12. an adjustment knob; 13. a clamping plate; 14. a jack; 15. a conduit; 16. a plug; 17. lifting the sleeve; 18. an inner convex ring; 19. a first spring; 20. a microphone; 21. a closed end plate; 22. a housing; 23. a top fixing plate; 24. an abutting plate; 25. a threaded hole; 26. a fixing frame; 27. a threaded sleeve; 28. a second spring; 29. a spring rod; 30. a top plate; 31. a lifting groove; 32. a limit stop; 33. and (5) a push rod.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Referring to fig. 1 to 6, the present invention provides a technical solution: the utility model provides a network broadcasting intercom system, this intercom system includes paging microphone 2, host computer unit 1 and a plurality of intercom terminal 4, intercom terminal 4 includes audio amplifier 5, fixed subassembly 9, adjustment mechanism 8, direction support 7 and terminal microphone 6, fixed subassembly 9 is installed at the top of direction support 7, audio amplifier 5 is installed to the bottom of fixed subassembly 9, the bottom of audio amplifier 5 is provided with adjustment mechanism 8, adjustment mechanism 8 includes roof 30 and bottom plate 10, terminal microphone 6 is installed to the bottom side of bottom plate 10, lifting groove 31 has been seted up to the inboard of direction support 7, the inboard of lifting groove 31 is all inlayed at the both ends of roof 30 and bottom plate 10, spring bar 29 is installed at the top of roof 30, and the rear end of spring bar 29 inserts to audio amplifier 5, limit stop 32 is installed in the inboard bottom welding of direction support 7, this network broadcasting intercom system is mainly through paging terminal with audio signal conversion into electrical signal transmission to host computer unit 1 in 3 through having a line-shaped transmission through host computer unit 1, finally through switch 3 send terminal 4 to each, and carry out the part through adjustment mechanism 5 after the terminal 4 is installed at the terminal part through adjustment mechanism 8 and after the terminal 7 is all installed at the terminal part through the terminal part of the side of support 8, the terminal part is installed through the terminal part of adjusting mechanism 7, 5 is all installed to the audio amplifier 5.
In this embodiment, the ejector pin 33 is welded and installed at the bottom of the top plate 30, the middle of the bottom plate 10 is inserted with the screw column 11, two sides of the bottom plate 10 are provided with the wire tube 15, the signal wire connected with the terminal microphone 6 passes through the interior of the wire tube 15, the top of the wire tube 15 is provided with the plug 16, the surface of the screw column 11 is provided with the clamping plate 13, the bottom of the screw column 11 is provided with the adjusting knob 12, the clamping plate 13 is respectively clamped at two sides of the bottom plate 10, the screw column 11 passes through the middle position of the top plate 30 upwards, the top plate 30 is partially connected with the sound box 5 through the second spring 28 and the spring rod 29 at the top, and the distance between the top plate 30 and the bottom plate 10 is regulated and controlled by the screw column 11, so the distance between the top plate 30 and the bottom plate 10 can be controlled by controlling the rotation of the screw column 11.
In this embodiment, the terminal microphone 6 includes a lifting sleeve 17 and a microphone 20, the surface of the bottom plate 10 is provided with a jack 14, the lifting sleeve 17 is installed at the bottom of the jack 14, the microphone 20 is installed at the inner side of the lifting sleeve 17, the top of the microphone 20 is connected with a first spring 19, the bottom of the microphone 20 is installed with a closed end plate 21, the closed end plate 21 is pressed at the bottom of the lifting sleeve 17 under the action of the first spring 19, the microphone 20 is electrically connected with the plug 16 through an electric wire, an inner convex ring 18 is provided on the inner wall of the lifting sleeve 17, the top of the first spring 19 is fixedly connected with the bottom of the inner convex ring 18, the central axis of the ejector rod 33 coincides with the central axis of the jack 14, and the sound box 5 and the microphone 20 in each intercom terminal 4 are separately arranged, the connection state of the microphone 20 and the intercom terminal 4 can be controlled by manually controlling the adjusting mechanism 8, so as to realize the on-off function, the microphone 20 can be shielded by the lifting sleeve 17 at the bottom when not in use, the microphone 20 is prevented from being blocked by external dust, specifically, when the microphone 20 is needed to be used, the screw column 11 is directly rotated by the adjusting knob 12, the bottom plate 10 can be controlled to move upwards, the ejector rod 33 at the top can be inserted into the jack 14 at the bottom along with the approach between the top plate 30 and the bottom plate 10, the microphone 20 at the bottom is finally pushed downwards until the bottom of the microphone 20 is pushed outwards, meanwhile, the line tube 15 at the end part is pulled upwards along with the jacket of the bottom plate 10 until the plug 16 at the top is partially embedded into the slot formed at the bottom of the intercom terminal 4, the automatic connection process of the microphone 20 is completed, when the microphone is not used, the threaded column 11 is reversely rotated, the bottom plate 10 can be moved downwards under the connection of the clamping plate 13 until the plug 16 is partially separated from the intercom terminal 4, and the microphone 20 at the bottom is embedded into the inner side of the lifting sleeve 17, so that the microphone 20 can be partially hidden and shielded through the lifting sleeve 17.
In this embodiment, the surface of audio amplifier 5 is provided with shell 22, top fixed plate 23 is installed at the rear end top of shell 22, fixed subassembly 9 includes mount 26 and butt plate 24, butt plate 24 welded mounting is in the bottom of mount 26, screw hole 25 has all been seted up on the surface of top fixed plate 23 and butt plate 24, mount 26 is through using screw fixed mounting on the side of guide bracket 7, the both ends of top fixed plate 23 and butt plate 24 are laminated with the inner wall of guide bracket 7, and every intercom terminal 4 all supports through the guide bracket 7 of rear, cooperatees with the fixed subassembly 9 at top through guide bracket 7, can control the concrete installation height of every audio amplifier 5 part, and installation height is adjustable, and the influence that vibration that produces when audio amplifier 5 used all can be reduced to the installation fastness in the adjustment mechanism 8 through the bottom in the arbitrary height, and specific during the installation, move down fixed subassembly 9 until pressing the inboard bolt 24 on top fixed plate 23, then use and pass every screw hole 25 in proper order, insert the fixed subassembly 9 in proper order to the guide bracket 7, and then fixed subassembly 9 can be fixed to the fixed part by the screw thread sleeve 9 at the side of the fixed subassembly 9.
In this embodiment, the threaded sleeve 27 is installed at the top of the spring rod 29, the second spring 28 is sleeved on the surface of the spring rod 29, and the top of the second spring 28 is fixedly connected with the bottom of the threaded sleeve 27, the bottom of the second spring 28 is fixedly connected with the surface of the top plate 30, the top fixing plate 23 and the butt plate 24 sequentially penetrate through the two threaded holes 25 through bolts and then are embedded into the threaded sleeve 27, the sound box 5 is fixedly connected with the guide bracket 7 through the fixing component 9, the fixing component 9 at the top is connected through the second spring 28 at the bottom, and therefore the internal threaded sleeve 27 can be supported during disassembly, so that the fixing component 9 and the sound box 5 can be disassembled and separated efficiently.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (2)
1. The utility model provides a network broadcast intercom system, this intercom system includes paging microphone (2), host computer unit (1), switch (3) and a plurality of intercom terminal (4), its characterized in that: the intercom terminal (4) comprises a sound box (5), a fixing component (9), an adjusting mechanism (8), a guide bracket (7) and a terminal microphone (6), the fixing component (9) is installed at the top of the guide bracket (7), the sound box (5) is installed at the bottom of the fixing component (9), the adjusting mechanism (8) is arranged at the bottom of the sound box (5), the adjusting mechanism (8) comprises a top plate (30) and a bottom plate (10), a lifting groove (31) is formed in the inner side of the guide bracket (7), two ends of the top plate (30) and the bottom plate (10) are embedded into the inner side of the lifting groove (31), a spring rod (29) is installed at the top of the top plate (30), the top of the spring rod (29) is inserted into the rear end of the sound box (5), a limit stop (32) is installed at the bottom of the inner side of the guide bracket (7) in a welding mode, the terminal microphone (6) comprises a lifting sleeve (17) and a microphone (20), a jack (14) is formed in the surface of the bottom plate (10), the lifting sleeve (17) is installed at the bottom of the jack (14), the microphone (20) is connected with the top of the microphone (20), the bottom of the microphone (20) is provided with a closed end plate (21), the closed end plate (21) is pressed at the bottom of the lifting sleeve (17) under the action of a first spring (19), the microphone (20) is electrically connected with a plug (16) through an electric wire, the surface of the loudspeaker box (5) is provided with a shell (22), the top of the rear end of the shell (22) is provided with a top fixing plate (23), the fixing assembly (9) comprises a fixing frame (26) and an abutting plate (24), the abutting plate (24) is welded and installed at the bottom of the fixing frame (26), the surfaces of the top fixing plate (23) and the abutting plate (24) are provided with threaded holes (25), the fixing frame (26) is fixedly installed on the side edge of the guide bracket (7) through screws, the two ends of the top fixing plate (23) and the abutting plate (24) are attached to the inner wall of the guide bracket (7), each abutting terminal (4) is supported through the guide bracket (7) at the rear side, the bottom of the top plate (30) is provided with a fixing plate (26), the middle post (11) is welded and the middle post (11) is provided with a threaded stud (11), clamping plate (13) centre gripping respectively in the both sides of bottom plate (10), screw thread post (11) upwards pass from the intermediate position of roof (30), be provided with interior bulge loop (18) on the inner wall of lift sleeve (17), the top of first spring (19) and the bottom fixed connection of interior bulge loop (18), the axis of ejector pin (33) coincides with the axis of jack (14), screw thread sleeve (27) are installed at the top of spring rod (29), the surface cover of spring rod (29) is equipped with second spring (28), and the top of second spring (28) and the bottom fixed connection of screw thread sleeve (27), the bottom of second spring (28) and the surface fixed connection of roof (30), top fixed plate (23) and butt joint board (24) are through using the bolt to pass the inside of screw thread sleeve (27) after two screw holes (25) in proper order again.
2. The network broadcast intercom system of claim 1 wherein: the utility model discloses a microphone, including bottom plate (10), signal line, terminal microphone (6) are connected, the both sides of bottom plate (10) are provided with spool (15), the signal line that terminal microphone (6) are connected passes from the inside of spool (15), and the top of spool (15) is provided with plug (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310788173.3A CN116744149B (en) | 2023-06-30 | 2023-06-30 | Network broadcast intercom system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310788173.3A CN116744149B (en) | 2023-06-30 | 2023-06-30 | Network broadcast intercom system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116744149A CN116744149A (en) | 2023-09-12 |
| CN116744149B true CN116744149B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310788173.3A Active CN116744149B (en) | 2023-06-30 | 2023-06-30 | Network broadcast intercom system |
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| Country | Link |
|---|---|
| CN (1) | CN116744149B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004775U (en) * | 2011-04-08 | 2011-10-05 | 湖南康通电子科技有限公司 | Internet protocol (IP) broadcast communication system of mines |
| CN206060818U (en) * | 2016-06-23 | 2017-03-29 | 广州高伍电子科技有限公司 | Network calling system |
| CN113055770A (en) * | 2021-03-16 | 2021-06-29 | 徐州中矿云火信息技术有限公司 | Visual mining ann's type audio amplifier |
| CN218181676U (en) * | 2022-08-25 | 2022-12-30 | 中国人民解放军火箭军工程大学 | Intelligent broadcast simulation training system and device |
| CN116155872A (en) * | 2023-02-21 | 2023-05-23 | 吉林华飞电子设备有限公司 | Host-free integrated IP network public address intercom system |
-
2023
- 2023-06-30 CN CN202310788173.3A patent/CN116744149B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202004775U (en) * | 2011-04-08 | 2011-10-05 | 湖南康通电子科技有限公司 | Internet protocol (IP) broadcast communication system of mines |
| CN206060818U (en) * | 2016-06-23 | 2017-03-29 | 广州高伍电子科技有限公司 | Network calling system |
| CN113055770A (en) * | 2021-03-16 | 2021-06-29 | 徐州中矿云火信息技术有限公司 | Visual mining ann's type audio amplifier |
| CN218181676U (en) * | 2022-08-25 | 2022-12-30 | 中国人民解放军火箭军工程大学 | Intelligent broadcast simulation training system and device |
| CN116155872A (en) * | 2023-02-21 | 2023-05-23 | 吉林华飞电子设备有限公司 | Host-free integrated IP network public address intercom system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116744149A (en) | 2023-09-12 |
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