Design of network broadcasting system based on CDMA

I. Introduction

In a modern society where network technology is developing rapidly, the broadcasting system is also being networked. Built-in CDMA wireless modules in decoders of broadcasting stations at all levels can be connected to remote switch rooms. It can realize remote access of substations, and local access of analog audio such as CD, radio (AM / FM / DAB) and microphone. Output to the lower-level broadcasting station, but also to AM / FM / DAB through the pre-output.

In addition to the upper-level broadcast, the terminal broadcast station can also access local analog audio. The output drives the tweeter / speaker through the power amplifier, or is modulated and output to the FM speaker.

Second, the system function design goals

1. Realize the entire broadcasting system through CDMA access.

2. Play background music regularly to create a good and harmonious environment. Users can achieve unmanned operation by programming the host according to their own needs after timing programming. At what time when what music is played and when there is a fire alarm, the music can be cut off for emergency broadcasting and commanding. The touch screen operation and signal pass through the CDMA wireless network transmission. Different music and radio can be played in different districts (each village and community) at the same time. This function can be manual or program timing. For example, if you play relaxing music in village A, you can also play jazz music in village B but not in village C.

3. It can realize unattended, remote paging, host-standby switchover function, and voice file curing. Normally, no operation is required, and the playback is performed according to the program compiled in advance. The control system can flexibly switch the program being played. Each terminal can also play its own program, but the host can cut off and change it.

4. Can receive fire alarm signal, when there is an alarm signal, it can be forcibly inserted into the area to be alarmed, with priority function

5. You can operate the host computer and increase or decrease the program through the computer and USB interface, which is very convenient and simple

6. It has the function of generating work logs, linking with the computer and realizing the function of sub-control. Provide convenience for users' use and after-sales service of the factory in the future

7. The music and business playback information of each terminal is arranged and transmitted to each terminal for storage through host management. You can add or delete terminal content by network control

8. Realize background music playback of various villages, publish real-time voice information and voice intercom between villages through CDMA network

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