I. User needs
Gaocun Town covers an area of 109.77 square kilometers, has a population of 41,000, 15 administrative villages, and 165 groups. In recent years, the original rural broadcasting has been in disrepair for a long time and is in a state of complete paralysis. As a result, local government orders, regional news, weather forecasts, emergency broadcasts, and information on getting rich have not been released in time. Coordination, objectively requires the establishment of a “village-to-village” broadcasting network at the town and village level, so that media propaganda is matched with local economic development .
The town now proposes the following broadcasting construction requirements:
Rural radio broadcasting system in towns and villages can prevent illegal broadcasts
Townships can make regular or emergency broadcasts to all villages or a village
In case of emergencies, township leaders can release emergency broadcast information in a timely manner via telephone for remote evacuation and command.
The village receiving equipment can be switched on and off at specified time points for automatic broadcasting
Can broadcast county radio programs to publicize the county's news and party and government policies
As the town does not currently have a closed circuit television network, wireless FM transmission is required
User demand analysis
After several years of market research, our company has been focusing on TV and light broadcasting in urban and rural areas, which has resulted in the aging and damage of rural broadcasting. In some places, there is no broadcast and it is completely paralyzed. As a mass media, broadcasting needs to be fast and untimed to publicize the Party's guidelines and policies, and the means of propagating scientific, technological, and cultural knowledge need to be consolidated and developed.
In the past, small speakers were used in the home, and broadcasting played a great role in promoting the party's policy in cities and rural areas. Now, broadcasting can also exert its advantages. But nowadays, because people rely heavily on television, small speakers are not conducive to the development of broadcasting. However, it is impossible to publicize the policies of the rural propaganda party, scientific and technological knowledge, prevention and control of diseases and insect pests, and comprehensive management of social order through television. Even if television is used for publicity, the effect of publicity is not obvious due to the difference in people's cultural quality, the choice of television channels. If FM radio loudspeakers are installed on the streets of towns and villages, on the fields in rural areas, and in villages in natural villages. People can listen to the radio while walking on the road, in the field, doing farm work, and sitting at the dinner table. They can learn new party policies, learn about science and technology, and contribute to the construction of a new countryside in a harmonious society.
Functional characteristics of rural wireless broadcasting systems
The functional characteristics of Hite Waiye ’s rural wireless broadcasting system can be summarized as “digitalization of audio sources, automation of playback, intelligent management, expansion of liberalization, emergency broadcast export ordering, and cost savings”. The use of this solution in rural areas has unparalleled advantages And economical.
3.1 Digitization of audio source:
The digitization of the playback source is compatible with modern and popular audio file formats.
3.2 playback automation:
The system can achieve 20 different automatic switching times per day. Before each program is played, the transmitter power is automatically turned on and the receiving speakers are automatically turned on. After the playback is over, the transmitter power is automatically turned off and the speakers are automatically turned off. Without manual intervention, it can play automatically, realizing unattended operation. Sudden power failure in the equipment room during the broadcast, the system will automatically resume broadcasting after a call. (Solved the shortage of rural radio stations)
3.3 Management Intelligence:
By manually operating the intelligent digital controller, the FM transmitter can be switched on and off. All receiving terminals can be group-opened, group-closed, or selected-opened, selected-closed. Each receiving terminal can be arbitrarily encoded online, and the volume can be freely controlled to each receiving terminal.
3.4 Extended Liberalization:
The system software can be technically upgraded at any time, and connected to a computer can freely expand the operating space.
3.5 Emergency broadcast export order:
The system is connected to the telephone network. Users only need to make simple phone calls to remotely control each or all of the receiving terminals, and send the telephone sound signals to the receiving speakers to implement the emergency broadcasting function. After finishing, the system will automatically close the receiving terminal and FM transmitter. (The system provides user passwords, rights management, and other functions to ensure your broadcasts are normally and securely broadcast.)
3.6 Cost savings:
Village-level or subordinate units in towns and villages do not need to repeatedly establish broadcasting rooms. After the administrative villages are authorized by the townships, they can use the department remotely through the telephone network. The system is divided into regions, and each administrative village can only control its own loudspeakers and carry out emergency broadcasting or policy promotion, saving a lot of capital investment.
Fourth, the principle of rural wireless broadcasting system
4.1 Principles of Rural Wireless Broadcasting System
The system adopts the new concept of "digital broadcasting, coding control and FM reception" to build a digital addressable intelligent broadcasting platform. Single or multiple audio signals are output from digital or analog program sources, directly to the mixer for audio split control, and can be addressed on the audio interface from the output of the mixer to the addressable smart encoder The audio of the intelligent encoder is output to the input port of the FM transmitter and modulated onto the FM carrier, and transmitted to each administrative village or natural village through the transmitting antenna. At the same time, the control data signal is directly controlled by the data output interface of the addressable smart encoder to the FM transmitter SCA interface. The coding control uses a very mature and stable FSK method.
The main equipment is composed of intelligent encoder, FM transmitter, various audio broadcasting systems, mixers, FM receivers and receivers; indoor FM speakers, outdoor FM columns and other equipment.