Radio broadcasting system based on ZigBee protocol

Abstract

The invention discloses a radio broadcasting system based on ZigBee protocol radio communication and PCM coding-decoding. According to the radio broadcasting system, a voice signal processing circuit (1), a PCM coding and multi-channel clock generation circuit (2) and a signal transmission circuit (3) are sequentially connected; the signal transmission circuit (3) is used for sending a signal to a ZigBee radio network (4), the signal is transmitted to a first radio reception circuit (5-1), a second radio reception circuit (5-2), ..., an nth radio reception circuit (5-n) through the ZigBee radio network (4) respectively, the first radio reception circuit, a first PCM decoding circuit and a first voice output circuit are sequentially connected, the second radio reception circuit, a second PCM decoding circuit and a second voice output circuit are sequentially connected, and the nth radio reception circuit, an nth PCM decoding circuit and an nth voice output circuit are sequentially connected. The radio broadcasting system is automatic in networking, capable of realizing encryption transmission, high-fidelity in radio signal transmission, simple and easy to operate in installation and maintenance, high in expansion capacity, low in cost, low in power consumption, and capable of working in a license-free frequency band of 2.4GHz.

Description

technical field [0001] The present invention is a wireless broadcasting system based on Zigbee protocol, which belongs to the technical field of wireless communication. Background technique [0002] Broadcasting system is a tool for disseminating public information, widely used in factories, campuses, stations, office buildings and other public places. The broadcast system can play background music and turn into an alarm broadcast in the event of an emergency. [0003] With the development of wireless communication technology, the research and application of wireless broadcasting technology are receiving more and more attention. The early broadcasting systems used cable broadcasting, which required poles and cables, which was extremely expensive, limited in coverage, and severely distorted the signal. Now the more popular wireless broadcasting systems use wireless AM or FM technology to realize the voice signal. It avoids the trouble of pole installation and has the advant...

AI Technical Summary

Problems solved by technology

The early broadcasting system used wired broadcasting, which required poles and wires, which was extremely costly, and the coverage was limited, and the signal distortion was also serious; but now the more popular wireless broadcasting system uses wireless AM or FM technology to realize voice signal The wireless transmission avoids the trouble of erecting poles, and has the advantages of convenient use and low cost, but there are also some shortcomings, such as underground pipelines, building basements and other places where wireless signals cannot be directly received or there is no ready-made broadcasting system for a while. cannot be applied at any time

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