Public Address System

System Overview

The networked public broadcasting system independently developed by Huayi is a bidirectional audio amplification system based on digital technology transmission. It combines the proprietary HVYI protocol and the standard TCP/IP protocol to transmit audio signals in the form of data packets over local and wide area networks, with a delay time of no more than 100ms within the local area network. It features sound repair, automatic traffic adjustment, and other functions, completely solving the problems of poor sound quality, limited transmission distance, lack of interaction, and complex maintenance management in traditional broadcasting systems.

The system is built using a unique modular hierarchical approach in the industry, with significant advantages such as high integration, intelligence, and user-friendly operation. Functions such as audio collection, telephone paging, fire linkage, and monitoring can be installed either as cards on the back of the host or as network expansion modules in any reachable location within the local area network, making function customization more flexible and maintenance more convenient.

The system can utilize the existing local area network architecture to achieve the integration of computer networks, digital video surveillance, public broadcasting, and other networks, with a transmission distance of up to several kilometers. It is quick to install, saves investment, and breaks through the traditional pattern where public broadcasting can only be transmitted downwards and controlled centrally through a main control room, providing powerful interactive functions. The system transmits analog audio signals after digital encoding on the network platform, achieving the functions of traditional broadcasting systems while overcoming the shortcomings of traditional broadcasting, such as signal interference from line impedance, power, voltage, and short transmission distances, making the sound clearer and more stable.

When transmitting programs, each program occupies only 0.1Mbps of bandwidth, allowing 300 different programs to be played simultaneously on 300 network terminals within a 100Mbps local area network, with independent volume control for each terminal. The system also features powerful functions such as real-time broadcasting, scheduled broadcasting, zone broadcasting, group broadcasting, telephone broadcasting, on-demand playback, real-time collection and broadcasting, intercom, fire linkage, one-click alarm, power control, forced output, output monitoring, on-site monitoring, program recording, secondary development, log query, software upgrades, and priority settings.

The audio quality output from the system's network terminals is close to CD level (44.1K, 16bit), with clear and beautiful sound quality that meets the requirements for background music appreciation and school listening tests.

The system server adopts an enterprise-level standard server working mode—system services run in the background, and the system automatically runs upon startup. It also uses a hot backup master-slave design, supporting automatic detection and switching. The network terminals come with SD card storage, support scheduled automatic backups, and are compatible with analog 100V backup, ensuring the system operates safely and stably 24 hours a day without interruption.

System Features

1. Modular Design  The system server adopts a modular design, with audio collection, telephone paging, fire linkage, power management, monitoring, and other functional modules that can be installed as cards on the back of the server or as network expansion modules and functional modules in any reachable location within the local area network, making server function customization more flexible, operation more convenient, and maintenance easier.

2. Networked Transmission   The system transmits analog audio signals after digital encoding on the network platform, avoiding signal attenuation and noise in traditional broadcasting systems, ensuring high-fidelity sound quality while overcoming the limitations of traditional broadcasting systems in terms of transmission distance, lack of interaction, and complex maintenance management.

3. Front-end Personalization   After the system terminal devices are online, each device terminal can be assigned a fixed IP address on the server, with specific device names noted, allowing independent adjustment of the broadcast volume, paging volume, and alarm volume for each device terminal.

4. User-friendly Operation  The system provides a user-friendly graphical menu interface, paired with a 17.3-inch full HD LCD touchscreen, supporting control via wireless mouse, keyboard, and other peripherals, making it convenient and practical to meet more user needs. It supports scheduled power on and off without manual operation.

5. Broadcasting Automation  The system can achieve scheduled broadcasting functions through programming, allowing any program to be played at any time in any designated zone, with adjustable program volume, truly realizing automated playback and unattended operation.

6. Simplified Installation  The system can utilize the existing local area network architecture, allocate a VLAN for the broadcasting system, and specify terminal IP addresses to achieve the integration of computer networks, digital video surveillance, public broadcasting, and other networks, making installation simple and quick.

7. Intelligent Application  The system application features a large number of intelligent designs, including intelligent sorting of terminal device displays, batch modification of device terminal IP addresses, remote editing and uploading of scheduled tasks, outdoor wireless remote control of the main program, and built-in speakers for program pre-listening, etc.

System Topology Diagram

System Functions

1. Covers Traditional Broadcasting System FunctionsIncluding business speech broadcasting, background music, scheduled ringing, and radio relay, etc.

2. Zone PagingThrough the server or IP network paging microphone, arbitrary broadcast calls can be made to individual, local, or all network terminals.

3. Zone BroadcastingThe system can set any number of groups to play designated programs and broadcast speeches to any specified group.

4. Scheduled PlaybackThe system will automatically broadcast according to the task plan at scheduled times and locations.

5. On-demand PlaybackThrough the remote control or device panel buttons, any program in the server's track library can be played on demand.

6. Audio Collection and BroadcastingExternal audio sources connect to the audio collection terminal, capturing and compressing into high-quality data streams in real-time, sending broadcast data over the network, with the network adapter receiving and playing in real-time for inserting external program broadcasts and announcements.

7. On-site Environment MonitoringThe network adapter can connect to external or built-in microphones to monitor the sound environment around the network terminal location in the main control room.An external network adapter or a built-in microphone on the panel can monitor the real-time sound around the location of the network terminal in the main control room.