What's the difference between a regular walkie-talkie and a commercial walkie-talkie?

Analog intercom system refers to the system that uses analog modulation technology to communicate between walkie-talkies, and mainly uses AM/FM to directly transmit analog voice (due to the advantages of transmission performance, most of the systems still in use are FM); In addition, DTMF technology can be used to transmit very little low-speed data information. At present, analog intercom is still the main way in the field of professional intercom. However, the analog intercom system has some problems, such as low frequency resource utilization, poor call confidentiality and single business type, which can not meet the communication needs of industry customers. Due to the backward technology of analog walkie-talkie, it is only a matter of time before analog walkie-talkie is eliminated by digital walkie-talkie from the aspects of technology, industry demand and national policy. In terms of national policy, the Ministry of Industry and Information Technology officially issued the "Document No.666" of digital walkie-talkie in June 5438+February 65438+February 2009, which clearly stipulated the timetable for the digital walkie-talkie manufacturers in China to change from analog technology system to digital technology system: from June 438+065438+ 10, 2065, the "analog to digital" was started, and after that, Notice of the Ministry of Industry and Information Technology on strengthening the management of radio transmitting equipment in 450-470MHz band and promoting the promulgation of unified standards. "Modular Revolution" is imperative.

Digital intercom system

Compared with analog intercom system, digital intercom system has brought many revolutionary changes to professional mobile communication.

First of all, digital technology can make more effective use of radio spectrum resources. Digital communication system can transmit multiple traffic channels on one channel, thus accommodating more users.

Second, provide integrated voice and data services. Users can get more and more accurate information and improve work efficiency. Compared with analog communication technology, digital communication system has stronger data processing ability, and can integrate more data into a wireless communication device, making the user's application solution more perfect.

Thirdly, digital communication technology can improve voice quality and communication quality in a wider range. Because digital communication technology has the function of in-system error correction, it can transmit accurate voice and data in a wider range and reduce voice distortion and data error rate. Digital system has excellent ability to suppress environmental noise, and can hear clear speech in very noisy environment.

Fourthly, the digital intercom system has the characteristics of high spectrum efficiency, clear voice, long battery life, strong communication confidentiality, strong anti-interference ability and long communication distance, and has many functions such as single call, group call, full call, emergency call, remote shooting/resurrection and so on. At the same time, the system also supports data transmission and value-added functions such as SMS and GPS.

3G/4G public network intercom system

The public network intercom service is a trunking service platform based on 3G/4G mobile public network. By using push-to-talk (PTT) technology, it provides customers with half-duplex trunking communication service within the coverage of mobile communication network through professional mobile phone terminals with public network intercom function.

Public network intercom has the following advantages:

First, the distance is not limited, the cell phone signal covers the area, and you can talk freely;

Second, the digital signal has clear sound quality and loud voice;

Third, the call confidentiality is strong, and there will be no leakage caused by the same frequency point;

Fourth, rich multimedia communication functions can realize voice, video and data services;

Fifth, the construction cost is low, relying on the public mobile network without deploying base stations;

Six, can expand the powerful multimedia scheduling function.