System Overview
The network visual intercom broadcasting system adopts mature IP voice technology, high-definition video technology, video intelligent analysis technology, remote IO control technology, etc. It transmits audio and video signals in the form of data packets within the local area network through the IP network. The fusion system not only solves the problem of long-distance transmission and distributed networking through network technology, but also is a highly integrated public broadcasting system and visual intercom system. The system can effectively integrate with the user's existing video monitoring system, access control, alarm, etc Seamless integration of LED display system. And achieve centralized operation of all devices and shared device resources. This greatly facilitates the requirements of users for centralized control of various system devices in system integration projects.
This system also extends the visual intercom function while integrating traditional broadcasting systems. The system is specifically designed for the integration of access control systems, monitoring systems, alarm systems, etc. in the project. By accessing video surveillance screens through standard protocols, visual broadcasting has been achieved. Through the built-in I/O output interface of the device, access control, lighting switches, and other devices can be remotely controlled, achieving integrated applications for remote operation.
The management center operating system supports both embedded and Windows systems, and its stability and operability are more intuitive compared to traditional broadcasting systems, such as computer operations and desktop microphone operations.
The intercom, monitoring, broadcasting, and alarm system of the system adopts a management mode of "multi-level sub control management and unified command". The system has a three-level management mode of terminal - sub control center - command (management) center. The command center is equipped with a primary server for the system, and each sub control center is equipped with intercom management hosts as secondary servers. Both the primary and secondary servers have the function of managing all intercom and broadcast terminals. A multi-level server management intercom, monitoring, broadcasting, and alarm system is established to ensure that the paralysis or failure of any server does not affect the operation of the entire system, including the intercom terminals managed by the faulty server. The command center and sub control center can make point-to-point, partitioned, or all calls and broadcasts to various equipment. At the same time as system calls, alarms, and intercoms, provide linkage signals to other systems and achieve linkage with the video monitoring system. It has functions such as alarm display, recording, and recording.

System topology diagram

System characteristics
 Our hospital intercom broadcasting system is a comprehensive integrated system that integrates visual intercom and public broadcasting.
We integrate the most commonly used functions from the above systems into the platform through standard protocol docking. Our company's system has the following characteristics:
The visual intercom broadcasting system of Mingke Hospital adopts mature IP voice technology, high-definition video technology, video intelligent analysis technology, and conference call technology. Through IP networks, audio and video signals are transmitted in the form of packets within the local area network. The hospital's visual intercom system not only solves the problem of long-distance transmission and distributed networking through network technology, but also serves as a highly integrated conference system and visual intercom broadcasting system. The system can seamlessly integrate with users' existing video intercom systems, conferences, and more. And achieve centralized operation of all devices and shared device resources. This greatly facilitates the user's need for centralized control of various system equipment operations in system integration projects.
The hospital visual intercom broadcasting system has been successfully implemented and operated in hospital projects in major provinces and cities across the country for many years. The system is specially designed for environments with extremely high reliability requirements, such as hospital projects, and has the following characteristics:
1. Adopting advanced audio processing technology: All terminal devices adopt hardware echo cancellation technology, which can effectively cancel out echoes and suppress noise, making the broadcast sound quality clearer.
2. High speech sampling rate: supports PCM AAC, G711 audio encoding formats; Supports MP3 WAV file format; Supports 8K-48K sampling rate and 32K-768K bit rate transmission; Breakthroughs in the field of voice, supporting the application of the system in full dual video voice calls and multi-party visual conferences.
3. Secure call: The system has encrypted the voice encoding to prevent eavesdropping.
4. Support national standards and advanced standard protocols: support standard protocols such as ONVIF protocol SIP protocol GB28181 protocol, providing standard interfaces for data sharing between platform subsystems; It can be separately connected to the VOIP telephone system (supporting mainstream IP-PBX) and can achieve audio and video calls with IP video phones.
5. Supports starlight function and high-definition video resolution: Video supports H.264 H. 265 encoding format, supporting CIF Multiple resolutions including D1, 720P, and 1080P; Supports starlight level night vision and wide dynamic, strong light suppression, and weak light compensation functions, allowing for clear facial recognition even under night and backlight conditions; Support real-time screen time and title overlay settings, which can overlay video resolution, bit rate, time, title content, and other information on the screen.
6. Strong integration capability: can integrate access control systems, video surveillance systems, alarm systems LED display system, building intercom system, etc; Breaking through the drawbacks of traditional broadcasting and intercom systems being separated and closed, achieving cross system linkage, including video and broadcasting linkage, remote control of access control, remote control of lighting switches, etc.
7. Data sharing: Through standard protocols and SDKs, data sharing can be achieved with Xueliang Engineering Platform, Ping'an City Platform, Police Platform, Smart Community Platform, and Smart City Platform.
8. Convenient system expansion: Simply connect the IP intercom terminal in a location where the IP can cover the network to achieve expansion.
9. One click alarm and linkage: The one click help button of the terminal device can link multi-level management centers and 110 alarm reception centers; The management center can obtain multiple alarm sources and receive terminal alarms; It has functions such as alarm display, recording, and recording
10. Full bidirectional visual intercom: The system provides one click call function; After the call is answered, immediately implement a full two-way video call in hands-free mode with echo cancellation function; The specific functions include monitoring, call insertion, multi-party meeting, call forwarding, status monitoring, etc.
11. Multiple broadcasting applications: supporting UDP TCP、 There are three broadcast transmission protocols for multicast, which can set different broadcast transmission methods for different scenarios. Strengthen security education and promote security knowledge through broadcasting, warn against predicted unsafe factors, play a preventive role, and effectively reduce the probability of danger occurrence; Support multiple broadcasting applications, including: full area broadcasting, zone broadcasting, timed broadcasting, and fire broadcasting.
12. Support for local and network storage: Local and network storage strategies can be configured in the system platform according to actual needs (storage method, storage time, storage conditions, etc.); Support the NVR storage function of mainstream manufacturers, and the terminal can directly store audio and video data in mainstream manufacturers such as Hikvision, Dahua, Keda, and Yushi's NVRs. Supports both full-time and scheduled storage. Audio and video can be stored simultaneously. The system centrally stores the audio and video recordings of all terminals in the management server, and synthesizes the audio and video files of the terminal and the audio files of the management center intercom into one MP4 file for storage. Users can access it at any time using the calling workstation or PC client.
13. Multi level management: The system adopts a management mode of "multi-level control management and unified command", which facilitates each level unit to perform its own duties. The system has a three-level management mode of terminal, sub control center, and command center (management center). The command center is equipped with a first level server, and each sub control center is equipped with a second level server. Both the first level server and the second level server have the function of managing their respective terminals, ensuring that any single point of failure does not affect the operation of the entire system, including the terminal for managing the faulty server. All device terminal cloud platform registration is convenient and fast.
14. Client and APP: One end controls the whole system, and users can control all front-end systems on one client, greatly improving practical value and user experience; The command center and sub control center can make point-to-point, partitioned, or all calls and broadcasts to various equipment; Mobile app users can control remote visual intercom, remote playback, and remote music playback by logging into the platform
15. On demand deployment: Configure suitable products according to the different needs of audio, video, broadcasting, and alarm in different places; On the one hand, it ensures practicality, and on the other hand, it ensures optimal cost-effectiveness; The device includes IP voice intercom alarms IP visual voice intercom alarm IP visual voice intercom broadcast alarm and basic pickup (analog, network) series products.
16. Cloud storage: It can realize the Internet voice transmission function and cloud storage function to meet the customer's network audio application.
17. Voice controlled deployment and alarm prompt: When the audio of the current device exceeds the set value, it will automatically pop up and prompt the real-time sound of the current alarm device.
18. Integrated Video: Supports video acquisition from platforms such as Hikvision and Dahua.
19. Automatic Equipment Inspection: The system can automatically inspect terminals and conduct real-time round robin inspections of system equipment operation, improving maintenance efficiency and reducing equipment maintenance costs.
20. Client automatic upgrade: The use of client automatic upgrade technology can effectively solve the problem of synchronizing and upgrading a large number of hosts.

system function
1. High definition visual intercom
Supports 1080P resolution high audio quality video calls, supports star level cameras, and can clearly recognize the caller's face even in extremely weak lighting conditions.
2. Audio and video multi-level storage
The terminal intercom device can not only store locally and centrally, but also connect with storage devices such as NVR to achieve 24-hour recording and video network storage. It can store critical and important data for a long time and provide audio and video synchronization and sharing data.
3. One click alarm
One button (single button or double button) call mode can specify the call target, central alarm can be triggered, and 110 can be dialed. (requires a voice gateway)
4. Full bidirectional video hands-free calling
After the call is answered, immediately conduct a full duplex call with echo cancellation in hands-free mode.
5. Remote Inspection (Course Tour, Inspection)
Users can remotely start terminal audio and video through management hosts and mobile apps to conduct on-site inspections; Convenient for remote inspection work, remote guidance, and emergency command.
6. Listening and interrupting
High level hosts can monitor low-level hosts and terminals during calls, and can insert calls into terminals.
7. Multi party video calls
Voice conferencing between hosts and terminals, and visual conferencing between hosts.
8. Call forwarding
When the terminal calls the host and the host cannot respond properly, call forwarding can be set according to the conditions: busy forwarding, disconnected forwarding, unresponsive forwarding, and time slot forwarding.
9. Public broadcasting
Full area broadcasting, the management host can broadcast MP3 files, call outs, and external audio sources for the managed terminal devices in the entire area; Partition broadcasting, the management host can perform MP3 file broadcasting and call broadcasting on the managed terminal device partitions; Timed broadcasting, the management host has a timed broadcasting function; During periods of frequent cases and frequent disasters and emergency events, automatic voice playback, information reminders, and knowledge dissemination can be performed on a scheduled basis; Fire broadcasting, the management host can use MP3 files as fire alarm voice, and when a fire alarm occurs, it automatically switches to the maximum volume;
10. Remote control
The system can be remotely controlled to open the door, turn on the lights LED screens can also be used for remote control of other devices with IO interfaces or RS-485 interface devices.
11. Mobile Management (APP)
Leaders and managers can achieve mobile management at various levels through mobile apps: obtain front-end alarm information, activate front-end on-site audio and video monitoring, inspect the on-site situation of the front-end (audio and video and surrounding environment), remotely control on-site broadcasting, intercom, and shouting, and deal with them. They can also interact with other hosts on the platform in real-time and report information.
12. Alarm linkage
When an alarm message occurs, according to the pre setting, the alarm message can be linked to different management hosts at all levels of the center, and the alarm message screen will automatically pop up; All levels of centers receive police reports as soon as possible.
13. Video linkage
The system can set associated videos for all terminals, and when there is a request or alarm signal from the terminal, related videos can be associated for audio and video synchronization.
14. Loop monitoring and monitoring
The host can freely select terminal extensions for monitoring and monitoring, or perform cyclic monitoring and monitoring on all terminal extensions. The duration of each stay can be set.
15. Three color door light status prompt
When an emergency call occurs, three color door lights can be configured for status reminders, with different colors for different states, which is beneficial for users to timely understand the situation and quickly locate the call target.
16. Status prompt
The management host and central server screens can visually display the real-time online and working status of all terminals in the jurisdiction, making it convenient for debugging, maintenance, and repair; Each button can add branch location description information for easy management and operation.