The difference and application of analog intercom, DMR digital intercom, and POC public network intercom

Date:Jan 04, 2021

Nowadays, as more and more walkie-talkies enter the market, many users will wonder, what is a digital walkie-talkie? What is a traditional walkie-talkie? What is the difference between the two? What kind of communication mode is the mobile phone intercom on the market? Why are digital walkie-talkies relatively expensive? What is so good about digital walkie-talkies? To answer the above questions, we must first clarify the differences and applications between the three.

In terms of design technology, radio walkie-talkies can be divided into analog walkie-talkies with analog communication technology (that is, our common traditional walkie-talkies) and digital walkie-talkies designed with digital technology. The analog walkie-talkie modulates the stored signal to the transmission frequency of the walkie-talkie, while the digital walkie-talkie digitizes the voice information and transmits it in the form of digital encoding, that is, all modulations on the transmission frequency of the walkie-talkie are digital.


Digital walkie-talkies have many advantages. First, they can make better use of spectrum resources. Similar to cellular digital technology, digital walkie-talkies can load more users on a designated channel and increase spectrum utilization. This is a solution to frequency congestion and has long-term significance. The second is to improve call quality. Because digital communication technology has an error correction function in the system, compared with analog walkie-talkies, it can achieve better voice and audio quality in a wider range of signal environments, and it will receive less audio noise and more sound. Clear. The last point is to improve and improve the integration of voice and data, and to change the weakness of the control signal that decreases as the communication distance increases. Compared with similar integrated analog voice and data systems, digital walkie-talkies can provide better data processing and interface functions, so that more data applications can be integrated into the same two-way wireless communication base station structure, for voice and data services The integration is more complete and more convenient. These three characteristics make digital walkie-talkies an inevitable trend in the development of future walkie-talkies. But for everyone, it is too early to say that analog is moving towards digitalization.

At present, the domestic production of walkie-talkies is still dominated by analog walkie-talkies, which is a communication mode in which voice, signaling, and signals are modulated to the walkie-talkie carrier frequency in a continuous wave manner, and optimized and processed through amplification. It has the advantages of mature technology, complete system and relatively low cost. Domestic walkie-talkie products are only active in the low-end market, and the country is also competing at low prices, and the cloning phenomenon is serious, which is doomed to face a major crisis in the walkie-talkie industry. Therefore, industry insiders believe that the development of analog walkie-talkies towards digitalization is a test of enterprise technology and strength. This process is also a good time for enterprises to reshuffle and take the opportunity to eliminate some weak enterprises.

Mobile pET-A87 (6)hone intercom (public network intercom), also known as POC, refers to a half-duplex voice service based on mobile cellular packet domain bearer and using voip technology. Can support one-to-one conversations, group conversations, broadcasts, etc. Its characteristic is that with the help of IP technology, POC services can be "always online" and the mobile communication network covers a large area. The transmission distance of ordinary walkie-talkies is limited. In recent years, there have been more and more mobile phone intercom applications, and telecommunications are also promoting it. In view of the fact that one-to-many group call function is the same as the traditional intercom function, and the communication range will not be controlled, there is a view that mobile phone intercom will replace traditional intercom.

Faced with a wolf suddenly rushing out of the grassland, manufacturers, distributors, and developers of walkie-talkies were extremely nervous. Originally, the product was struggling to survive the accusations of "low technology". Now, it seems that the end is really approaching. But from my own point of view, you don’t need to be so self-deprecating. From the perspective of functional equivalence, it can indeed replace some market applications, such as taxi applications. However, it may be too early to snatch the dress up based on 3G technology. Intercom also has its obvious limitations. First, mobile phone intercoms are not developed and sold by operators themselves. Relatively speaking, their efforts are relatively limited. This business has been launched for so long until now, and little is known about it. Second, the traditional walkie-talkie is a one-time purchase, and the cost is relatively good. The mobile phone intercom not only requires the purchase cost, but also requires a certain monthly communication fee. Although the mobile phone intercom does not need to pay the construction cost of the relay system, the rent of the computer room and the electricity fee, and there is no need to go to the office to handle the payment of the frequency application fee, it is still more troublesome in the budget of many units. Third, the mobile phone intercom is always "always online", and the power consumption is significantly increased. The speaker volume of the intercom mobile phone that needs to be dispatched is very loud, which also increases the power consumption. The increased double burden makes the battery life of the intercom phone unsatisfactory. Fourth, the intercom mobile phone uses VOIP technology, based on CDMA1/EVDO, which is mobile phone public network communication. This communication requires the help of public network and private network (VPDN), which are two types of networks. This kind of borrowing itself is actually very big. Defects. For example, once an emergency occurs, such as an earthquake, or the network is damaged, or the network is blocked due to dense personal communication, the intercom function of the mobile phone will inevitably be interrupted. When there is no internet, it becomes a crash, especially for some emergency security, it cannot be replaced by an intercom phone. As we all know, the biggest advantage of the walkie-talkie is that it responds quickly. Its access time is only a few tenths of a second, and it is difficult to guarantee the access time of the walkie-talkie phone. Sometimes it takes a few seconds, and sometimes it may not be connected, depending on the current network application status. In emergency dispatch and command, one second is enough to trigger an irreversible terrorist incident.

There are also some shortcomings, such as poor sound quality, generating network traffic, troublesome procedures, and not as intuitive to use as walkie-talkies. These deficiencies are enough to greatly restrict its application in the market. Although the current digital walkie-talkie market is promising, the analog technology, which is already very mature in walkie-talkie technology, will continue to serve the design of walkie-talkies for a long period of time. Digital walkie-talkies cannot replace analog walkie-talkies in a short time. Many manufacturers held this view in the interview. In fact, this view has also been recognized by experts. With the ever-changing development of communication technology, no one will eventually replace anyone, but integration is an inevitable trend.

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The digital walkie-talkies that everyone is talking about are good, but they are expensive. There are still many ways to go to open up markets in China or other parts of the world (except Europe and America) to replace analog phones. Therefore, it can be said that it is too early to talk about the elimination of analog machines and the replacement of digital machines. Since digital trunking machines are used in command and dispatch, security departments, and large enterprises, it is acceptable to use less expensive ones. With the exception of a few high-end radios, most of the walkie-talkies users are completely other user groups, and they are only acceptable if they are large in quantity and low in price. Therefore, whether in China or in many parts of the world, analog walkie-talkies will be longer Continue to occupy the majority share of the walkie-talkie market within time. Only when the cost of digital walkie-talkies has dropped drastically, and its technology has been mastered by more manufacturers, and when different grades of digital walkie-talkies can be accepted by different user groups, it is not too late to talk about it. At home or in many parts of the world, the first thing to do is to solve the problem of buying and working, and then the problem of using the machine. At present, the analog technology of walkie-talkies is very mature, and the key components are very reliable. Whether in terms of call quality or basic functions, especially cost-effectiveness, it can fully meet the needs of users in different industries and levels, and can adapt to the consumption levels of different users. Elimination or replacement, all this will be determined by the walkie-talkie market, and the user has the final say.

In the past, in industrial development, we often incubate technology into products, which cannot withstand competition and have poor efficiency. In-depth adjustment emphasizes that when knowledge is incubated as technology, only technology can be competitive and achieve high efficiency and high income. From the above analysis, the innovative application of walkie-talkies has not only won a piece of cake in the market, but also provided companies and manufacturers with some new technological innovations and business opportunities. This is the law of market development and is irresistible. The walkie-talkie can only maintain its market share if it is innovative in service. Facing the black barrier period of analog-to-digital conversion, everyone only needs to be prepared for danger in times of peace, keep making progress, and continuously integrate various new technology applications into analog-to-digital conversion in exchange for unlimited development space.

At present, many special industries such as the command and dispatch of digital cluster machines, security departments, and large enterprises have begun to be widely used. Now people are increasingly calling for digital intercoms, and digital intercoms will definitely have a huge demand market. However, no matter how widely used digital walkie-talkies are, at least for a long period of time, they will continue to provide design services for walkie-talkies, and develop in the direction of small size, low cost, strong functions, and more commercialization to meet the different needs of communication users. . Digital walkie-talkies cannot replace analog walkie-talkies in a short time, and mobile phone intercom will not replace analog walkie-talkies. Still, no one replaces anyone. Development is the last word, innovation is the best idea, and they will all be used. Each has its own characteristics and develops together.