CN214627196U - Web-based visual intercom system - Google Patents
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- CN214627196U CN214627196U CN202120477964.0U CN202120477964U CN214627196U CN 214627196 U CN214627196 U CN 214627196U CN 202120477964 U CN202120477964 U CN 202120477964U CN 214627196 U CN214627196 U CN 214627196U
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Abstract
The utility model provides a pair of visual intercom system based on web, this system include first visual intercom equipment, to first scene positioning device, first local network equipment, video encoder, audio encoder, the synchronous encoding equipment of audio frequency and video, web server, audio decoder, video decoder, second local network equipment, the visual intercom equipment of second and the second scene positioning device to the scene location of the visual intercom equipment of second of first visual intercom equipment. The staff passes through the utility model provides a visual intercom system can realize the visual intercom in the closed scene. Compared with the prior art, the utility model provides a visual intercom system's security and adaptability are higher.
Description
Technical Field
The utility model belongs to the technical field of the equipment of talkbacking, concretely relates to visual intercom system based on web.
Background
As a common working device, intercom devices have been widely used in a plurality of industries, such as entrance guard intercom, warehouse management, and the like. Visual intercom is a situation in which both parties observe the surroundings of the opposite party from the perspective of vision and hearing. In the prior art, visual intercom communication is realized, multiple parties need to equip visual intercom equipment, most equipment installation positions are fixed positions needing monitoring, for example, a central control room is used for centralized control, and if a manager is not in the central control room, the manager cannot know the current situation of an operation site in real time.
With the diversity of mobile device functions, such as cell phones. The manager can use the mobile phone to carry out video call with the field personnel so as to realize video monitoring at any time and any place. However, due to the high privacy of the mobile phone, for some scenes with high privacy, the staff often does not allow to carry a private mobile phone to prevent the scene information from being revealed. And the mobile phone relies on satellite signals, and the satellite signals are poor in a closed scene, so that the effect of talkback of the two parties is poor, and therefore, the talkback equipment in the prior art is poor in adaptability, high in cost and inconvenient to operate.
SUMMERY OF THE UTILITY MODEL
In order to solve the above-mentioned problem that exists among the prior art, the utility model provides a visual intercom system based on web. The to-be-solved technical problem of the utility model is realized through following technical scheme:
the utility model provides a pair of visual intercom system based on web includes:
the first visual intercom device is respectively connected with the first local network device and the first scene positioning device and used for receiving video information and voice information of a user;
the first scene positioning equipment is respectively connected with the first visual intercom equipment and the first local network equipment to position the coordinate information of the first visual intercom equipment in the scene;
the first local network equipment is respectively connected with the first visual intercom equipment, the first scene positioning equipment, the video encoder and the audio encoder, stores the video information, the voice information and the coordinate information of the first visual intercom equipment and the second visual intercom equipment, and transmits the video information, the voice information and the coordinate information of the second visual intercom equipment to the first visual intercom equipment;
the video encoder is respectively connected with the first local network equipment and the audio and video synchronous encoding equipment, acquires video information from the first local network equipment for encoding, transmits coordinate information and encoded video information to the audio and video synchronous encoding equipment,
the audio encoder is respectively connected with the first local network equipment and the audio and video synchronous encoding equipment, acquires audio information from the first local network equipment for encoding, and transmits the audio information to the audio and video synchronous encoding equipment;
the audio and video synchronous encoding equipment is respectively connected with the audio encoder, the video encoder and the web server, and uploads the synchronous audio and video information and the coordinate information to the web server after the encoded audio information and the encoded video information are synchronized;
the web server establishes a network communication link among the audio and video synchronous encoding equipment, the video decoder and the audio decoder;
the audio decoder and the video decoder are respectively connected with the output end of the web server and the input end of the second local network equipment, and are used for decoding the synchronous audio and video information and transmitting the synchronous audio and video information to the second local network equipment;
the second visual intercom device is respectively connected with the second local network device and the second scene positioning device and used for receiving video information and voice information of the user;
the second scene positioning equipment is respectively connected with the second visual intercom equipment and the second local network equipment to position the coordinate information of the second visual intercom equipment in the scene;
and the second local network equipment is respectively connected with the second visual intercom equipment, the second scene positioning equipment, the video decoder and the audio decoder, stores the video information, the voice information and the coordinate information of the first visual intercom equipment and the second visual intercom equipment, and transmits the video information, the voice information and the coordinate information of the first visual intercom equipment to the second visual intercom equipment.
Optionally, the first scene positioning device includes:
the RFID identification module is respectively connected with the image acquisition module and the AR module, and is used for identifying the labels in the scene and transmitting the labels to the image acquisition module and the AR module;
the image acquisition module acquires an indoor image and transmits the indoor image to the AR module;
and the AR module is used for establishing an indoor stereogram by combining the indoor image and the image containing the label, and positioning the position of the visual intercom device in the scene by combining the coordinate information of the visual intercom device.
Optionally, alarm buttons are arranged on the first visual intercom device and the second visual intercom device, when a user using the visual intercom devices starts the alarm buttons, the positioning information uploaded by the visual intercom devices of the other users is set to be abnormal through the web server.
Optionally, the visual intercom system further comprises: a smoke sensor and a controller, wherein the smoke sensor is connected with the controller,
the controller is connected between the smoke sensor a and a first local network device, and between the smoke sensor B and a second local network device,
when the smoke sensor detects that the smoke concentration in a scene exceeds a threshold value, an early warning signal is sent to a connected controller;
the controller sends fire early warning to the connected local network equipment and broadcasts the fire early warning to the visual intercom equipment of the opposite side through the web server.
Optionally, the video intercom system further includes a central control server and a display in the central control room, the central control server is connected to the web server, the display is connected with the central control server, the central control server obtains video information, audio information and positioning information of the first video intercom device and the second video intercom device from the web server, and controls the display to display.
Optionally, the audio and video synchronization encoding device includes: a time extraction unit, an audio and video frame segmentation unit and a frame alignment unit,
the time extraction unit is connected with the audio and video segmentation unit and the frame alignment unit, the audio and video segmentation unit completes frame segmentation of video information and audio information of the first video intercom device according to the time sequence extracted by the time extraction unit, and the frame alignment unit synchronously encodes the audio frame and the video frame and outputs encoding information.
Optionally, the first visual intercom device and the second visual intercom device are provided with wireless communication units, and the wireless communication units are wirelessly connected with the local network devices to achieve wireless communication.
Optionally, the first visual intercom device and the second visual intercom device include a fingerprint verification unit and a voiceprint verification unit connected to the internal motherboard, and the user to be used is verified before the intercom communication is completed.
Optionally, the visual intercom system further comprises: and the cluster service controller is connected with the first local network equipment and the second local network equipment to complete the establishment of a reliable link between the auxiliary web server and the first visual intercom equipment and between the auxiliary web server and the second visual intercom equipment.
Optionally, the visual intercom system further includes a power module, the power module includes a plurality of switching power supplies and an isolator, and the switching power supplies provide a matched power supply for each device in each visual intercom system through the isolator.
The utility model provides a pair of visual intercom system based on web, this system include first visual intercom equipment, to first scene positioning device, first local network equipment, video encoder, audio encoder, the synchronous encoding equipment of audio frequency and video, web server, audio decoder, video decoder, second local network equipment, the visual intercom equipment of second and the second scene positioning device to the scene location of the visual intercom equipment of second of first visual intercom equipment. The staff passes through the utility model provides a visual intercom system can realize the visual intercom in the closed scene. Compared with the prior art, the utility model provides a visual intercom system's security and adaptability are higher.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a web-based video intercom system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a scene positioning apparatus provided in an embodiment of the present invention;
fig. 3 is an internal structure schematic diagram of an audio and video synchronous encoding device provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
Example one
As shown in fig. 1, the present invention provides a web-based visual intercom system, which includes:
the first visual intercom device 1 is respectively connected with the first local network device 3 and the first scene positioning device 2 and receives video information and voice information of a user;
the first visual intercom device and the second visual intercom device have the functions of collecting images and voice information, and the devices can comprise a camera, a voice collecting device and a voice recognition device, so that the collection and recognition of voice and video information of users and scenes are realized.
The first scene positioning equipment 2 is respectively connected with the first visual intercom equipment 1 and the first local network equipment 3 to position the coordinate information of the first visual intercom equipment 1 in the scene;
the first local network equipment 3 is respectively connected with the first visual intercom equipment 1, the first scene positioning equipment 2, the video encoder 4 and the audio encoder 5, stores the video information, the voice information and the coordinate information of the first visual intercom equipment 1 and the second visual intercom equipment 111, and transmits the video information, the voice information and the coordinate information of the second visual intercom equipment 111 to the first visual intercom equipment 1;
the video encoder 4 is respectively connected with the first local network device 3 and the audio and video synchronous encoding device 6, acquires video information from the first local network device 3 for encoding, transmits coordinate information and encoded video information to the audio and video synchronous encoding device 6,
the audio encoder 5 is respectively connected with the first local network device 3 and the audio and video synchronous encoding device 6, acquires audio information from the first local network device 3, encodes the audio information, and transmits the encoded audio information to the audio and video synchronous encoding device 6;
the audio and video synchronous encoding equipment 6 is respectively connected with the audio encoder 5, the video encoder 4 and the web server 7, synchronizes the encoded audio information and the encoded video information, and uploads the synchronous audio and video information and the coordinate information to the web server 7;
the web server 7 establishes a network communication link among the audio and video synchronous encoding equipment 6, the video decoder 8 and the audio decoder;
the audio decoder 9 and the video decoder 8 are respectively connected with the output end of the web server 7 and the input end of the second local network device 10, decode the synchronous audio and video information and transmit the decoded synchronous audio and video information to the second local network device 10;
the second visual intercom device 11 is respectively connected with the second local network device 10 and the second scene positioning device 12, and receives video information and voice information of a user;
the second scene positioning device 12 is respectively connected with the second visual intercom device 11 to position the coordinate information of the second visual intercom device 11 in the scene through the second local network device 10;
and the second local network device 10 is respectively connected with the second visual intercom device 11, the second scene positioning device 12, the video decoder 8 and the audio decoder 9, stores the video information, the voice information and the coordinate information of the first visual intercom device 1 and the second visual intercom device 11, and transmits the video information, the voice information and the coordinate information of the first visual intercom device 1 to the second visual intercom device 11.
The first visual intercom device and the second visual intercom device are installed in a scene needing operation, and the monitoring angles of the first visual intercom device and the second visual intercom device are monitored through the rotation angle, so that two workers can enter the monitoring visual angle of the visual intercom devices. In different operation scenes, workers need to know the operation condition of the site so as to adjust the work in real time. Staff 1 can hand first visual intercom, carries out pronunciation and video conversation through first visual intercom. Meanwhile, when the worker 1 moves in the scene, the first scene positioning device can position the coordinates of the first visual intercom device in the scene, and send the voice information, the video information and the coordinate information to the first local network device. The first local network device then encodes this information through a video encoder and an audio encoder. Because different frames of the audio and the video are easy to appear in the encoding process, the audio and video synchronous encoding equipment synchronizes the encoding information in the encoding process and uploads the encoding information to the web server. Meanwhile, the second visual intercom device receives the voice information and the video information of the staff 2, and the second scene positioning device positions the coordinates of the second visual intercom device in the scene and then sends the coordinates to the second local network device. When the staff 1 communicates with the staff 2, the web server transmits the positioning information, the video information and the voice information of the first visual intercom device to the second visual intercom device through the video decoder and the audio decoder, and the communication process is completed. Because do not rely on the satellite signal, difficult emergence network interruption compares in cell-phone communication simultaneously, in sealing the scene, the utility model provides a visual intercom system's security and adaptability are higher.
The utility model provides a pair of visual intercom system based on web, this system include first visual intercom equipment, to first scene positioning device, first local network equipment, video encoder, audio encoder, the synchronous encoding equipment of audio frequency and video, web server, audio decoder, video decoder, second local network equipment, the visual intercom equipment of second and the second scene positioning device to the scene location of the visual intercom equipment of second of first visual intercom equipment. The staff passes through the utility model provides a visual intercom system can realize the visual intercom in the closed scene. Compared with the prior art, the utility model provides a visual intercom system's security and adaptability are higher.
In the second embodiment, the first embodiment of the method,
as shown in fig. 2, as an alternative embodiment of the present invention, the first scene positioning device 2 includes:
the RFID identification module 123 is respectively connected to the image acquisition module 121 and the AR module 122, and is configured to identify tags in a scene and transmit the tags to the image acquisition module and the AR module 122;
the image acquisition module 121 acquires an indoor image and transmits the indoor image to the AR module 122;
the AR module 122 establishes an indoor stereogram in combination with the indoor image and the image including the tag, and positions the position of the visual intercom device in the scene in combination with the coordinate information of the visual intercom device.
It can be understood that in the prior art, the positioning is often carried out by using the GPS, but the GPS can only position a plane two-dimensional coordinate position. When in an indoor closed scene, positioning is required in the indoor scene. The utility model provides a scene positioning device contains the AR module, and this AR module can gather indoor scene picture in advance, founds indoor stereogram to this sets up indoor map. Meanwhile, labels can be pasted on the indoor scene, and the RFID identification module identifies the labels so as to correct the offset positioning in the indoor map. When the visible intercom device is positioned indoors, the image acquisition module can acquire images and compare the images with each frame of image in an indoor map, so that the specific indoor position of the visible intercom device is determined.
EXAMPLE III
As an alternative embodiment, the alarm button is provided on the first visual intercom device 1 and the second visual intercom device 11, and when the user of one party who uses the visual intercom device starts the alarm button, the positioning information uploaded by the visual intercom device of the other party is set to be abnormal through the web server 7.
It can be understood that when an abnormality occurs indoors, for example, a fire occurs at a certain position of a scene or a production line is interrupted, a worker may activate an alarm button, and the web server sets the positioning information as an abnormality and waits for a maintenance worker. When a maintenance worker enters the scene, the maintenance worker can directly maintain the position with abnormal positioning without cruising again, so that the maintenance efficiency is improved.
Example four
As an alternative embodiment of the present invention, the visual intercom system further includes: a smoke sensor and a controller, wherein the smoke sensor is connected with the controller,
the controller is connected between the smoke sensor a and the first local network device 3, and between the smoke sensor B and the second local network device 10,
when the smoke sensor detects that the smoke concentration in a scene exceeds a threshold value, an early warning signal is sent to a connected controller;
the controller sends fire early warning to the connected local network equipment and broadcasts to the visual intercom equipment of the other party through the web server 7.
It can be understood that when a fire or excessive smoke occurs in a closed scene, workers need to quickly deal with the field situation if the workers are faint. At the moment, the smoke sensor sends an early warning signal to the controller so as to start the visual intercom device to display the scene fire situation and broadcast the scene fire early warning to inform the staff of the other party to assist in processing.
EXAMPLE five
As an alternative embodiment, the visual intercom system further comprises a central control server and a display according to the central control room, wherein the central control server is connected to the web server 7, the display is connected to the central control server, and the central control server acquires the video information, the audio information and the positioning information of the first visual intercom device 1 and the second visual intercom device 11 from the web server 7 and controls the display to display.
It can be understood that after the visual intercom system enters a closed scene, the web server can be connected with the central control server of the central control room in order to monitor the situation of the site in real time, so that the staff in the central control server can monitor the situation of the site in real time to deal with the complex change of the site. Meanwhile, more intelligent work adjustment is realized, and the working efficiency of the site is improved.
EXAMPLE six
As shown in fig. 3, as an optional embodiment of the present invention, the audio/video synchronization encoding device 6 includes: a time extraction unit 61, an audio and video frame slicing unit 62 and a frame alignment unit 63,
the time extraction unit 61 is connected to the audio and video segmentation unit 62 and the frame alignment unit 63, the audio and video segmentation unit 62 is connected to the frame alignment unit 63, the audio and video segmentation unit 62 completes frame segmentation of the video information and the audio information of the first video intercom device 1 according to the time sequence extracted by the time extraction unit 61, and the frame alignment unit 63 synchronously encodes the audio frame and the video frame and outputs encoded information.
It is understood that audio is made up of a plurality of temporal frames of an audio sequence and video is made up of a plurality of temporal frames of a video sequence. Different moments correspond to an audio frame and a video frame, so that audio and video synchronization can be segmented according to time. The time extraction unit extracts the time sequences of the audio and the video at different moments, the audio and video segmentation unit segments the frames of the audio and the video, and the frame alignment unit aligns and codes the audio and the video according to the same moment to complete synchronous coding of the audio and the video.
EXAMPLE seven
As an alternative embodiment, the wireless communication unit is provided with on the visual intercom equipment 11 of first visual intercom equipment 1 and second, and wireless connection realizes wireless communication between wireless communication unit and the local network equipment.
It can be understood that, in order to improve the convenience of the video intercom device, the video intercom device can be in wireless communication with the local network device, and the wireless communication unit can be arranged on the video intercom device and is in wireless communication with the local network device through a wireless interface.
Example eight
As an alternative embodiment of the present invention, the first visual intercom device 1 and the second visual intercom device 11 include a fingerprint verification unit and a voiceprint verification unit connected to the internal main board, and the user to be used is verified before the intercom communication is performed.
It can be understood that in order to improve the safety of the visual intercom system and ensure the safety of information in a closed scene, the fingerprint verification can be carried out on personnel using the visual intercom device.
Example nine
As an alternative embodiment of the present invention, the visual intercom system further includes: and the cluster service controller is connected with the first local network device 3 and the second local network device 10, and completes the establishment of reliable links between the auxiliary web server 7 and the first visual intercom device 1 and the second visual intercom device 11.
It is appreciated that as the number of visual intercom devices in a visual intercom system increases, the local web-server network environment may degrade. In order to adjust the network structure, the cluster service controller in the visual intercom system can be directly connected with the first local network device and the second local network device, an auxiliary link is proposed, the positioning information is transmitted from the link, the pressure between the web server and the links established by the first visual intercom device and the second visual intercom device is reduced, and the reliability of communication is improved.
Example ten
As an alternative embodiment, the visual intercom system further includes a power module, the power module includes a plurality of switching power supplies and an isolator, and the switching power supply provides the assorted power for every equipment in every visual intercom system through the isolator.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (9)
1. A web-based visual intercom system comprising:
the first visual intercom device is respectively connected with the first local network device and the first scene positioning device and used for receiving video information and voice information of a user;
the first scene positioning equipment is respectively connected with the first visual intercom equipment so as to position the coordinate information of the first visual intercom equipment in the scene through the first local network equipment;
the first local network equipment is respectively connected with the first visual intercom equipment, the first scene positioning equipment, the video encoder and the audio encoder, stores video information, voice information and coordinate information of the first visual intercom equipment and the second visual intercom equipment, and transmits the video information, the voice information and the coordinate information of the second visual intercom equipment to the first visual intercom equipment;
the video encoder is respectively connected with the first local network equipment and the audio and video synchronous encoding equipment, acquires video information from the first local network equipment for encoding, and transmits coordinate information and the encoded video information to the audio and video synchronous encoding equipment,
the audio encoder is respectively connected with the first local network equipment and the audio and video synchronous encoding equipment, acquires audio information from the first local network equipment for encoding, and transmits the audio information to the audio and video synchronous encoding equipment;
the audio and video synchronous encoding equipment is respectively connected with the audio encoder, the video encoder and the web server, and uploads the synchronous audio and video information and the coordinate information to the web server after the encoded audio information and video information are synchronized;
the web server establishes a network communication link among the audio and video synchronous encoding equipment, the video decoder and the audio decoder;
the audio decoder and the video decoder are respectively connected with the output end of the web server and the input end of the second local network equipment, and are used for decoding the synchronous audio and video information and transmitting the synchronous audio and video information to the second local network equipment;
the second visual intercom device is respectively connected with the second local network device and the second scene positioning device and used for receiving video information and voice information of the user;
the second scene positioning equipment is respectively connected with the second visual intercom equipment and second local network equipment to position the coordinate information of the second visual intercom equipment in the scene;
the second local network equipment is respectively connected with the second visual intercom equipment, the second scene positioning equipment, the video decoder and the audio decoder, stores the video information, the voice information and the coordinate information of the first visual intercom equipment and the second visual intercom equipment, and transmits the video information, the voice information and the coordinate information of the first visual intercom equipment to the second visual intercom equipment;
and the cluster service controller is connected with the first local network equipment and the second local network equipment to complete the establishment of a reliable link between the auxiliary web server and the first visual intercom equipment and between the auxiliary web server and the second visual intercom equipment.
2. A visual intercom system as in claim 1 wherein said first scene locating device comprises:
the RFID identification module is respectively connected with the image acquisition module and the AR module, and is used for identifying the labels in the scene and transmitting the labels to the image acquisition module and the AR module;
the image acquisition module acquires an indoor image and transmits the indoor image to the AR module;
and the AR module is used for establishing an indoor stereogram by combining the indoor image and the image containing the label, and positioning the position of the visual intercom device in the scene by combining the coordinate information of the visual intercom device.
3. The video intercom system according to claim 1, wherein the first video intercom device and the second video intercom device are provided with alarm buttons, and when a user of one party using the video intercom devices starts the alarm buttons, the web server sets the positioning information uploaded by the video intercom device of the other party to be abnormal.
4. A visual intercom system as in claim 1 further comprising: a smoke sensor and a controller, wherein the smoke sensor is connected with the controller,
the controller is connected between the smoke sensor and the first local network device, and between the smoke sensor and the second local network device,
when the smoke sensor detects that the smoke concentration in a scene exceeds a threshold value, an early warning signal is sent to a connected controller;
the controller sends fire early warning to the connected local network equipment and broadcasts the fire early warning to the visual intercom equipment of the opposite side through the web server.
5. The video intercom system according to claim 1, further comprising a central control server in a central control room, wherein the central control server is connected to the web server, and a display connected to the central control server, wherein the central control server obtains video information, audio information and positioning information of the first video intercom device and the second video intercom device from the web server and controls the display of the display.
6. A visual intercom system as in claim 1 wherein said audio-visual synchronous encoding device comprises: a time extraction unit, an audio and video frame segmentation unit and a frame alignment unit,
the time extraction unit is connected with the audio and video segmentation unit and the frame alignment unit, the audio and video segmentation unit is connected with the frame alignment unit, the audio and video segmentation unit completes frame segmentation of video information and audio information of the first visual intercom according to the time sequence extracted by the time extraction unit, and the frame alignment unit synchronously encodes audio frames and video frames and outputs encoding information.
7. The visual intercom system according to claim 1, wherein wireless communication units are provided on said first visual intercom device and said second visual intercom device, said wireless communication units are wirelessly connected to said local network devices to implement wireless communication.
8. A visual intercom system as in claim 1 wherein said first visual intercom and said second visual intercom include a fingerprint authentication unit and a voiceprint authentication unit connected to an internal motherboard to complete authentication of the user in use prior to the intercom communication.
9. A visual intercom system as in claim 1 further comprising a power module, said power module comprising a plurality of switching power supplies and an isolator, said switching power supplies providing a matched power supply to each device in each visual intercom system through the isolator.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116405801A (en) * | 2023-05-31 | 2023-07-07 | 中瑞科技术有限公司 | Interphone system capable of early warning and broadcasting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116405801A (en) * | 2023-05-31 | 2023-07-07 | 中瑞科技术有限公司 | Interphone system capable of early warning and broadcasting |
| CN116405801B (en) * | 2023-05-31 | 2023-09-08 | 中瑞科技术有限公司 | Interphone system capable of early warning and broadcasting |
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