Advantages and disadvantages of analog intercom system and digital intercom system

The difference between the analog intercom system and the digital intercom system is that the analogue walkie-talkie has a smaller user capacity than the digital walkie-talkie in a single channel, and the voice is not as clear as the digital walkie-talkie, and can only realize simple data functions.

There are two kinds of digital walkie-talkies: TDMA and FDMA, TDMA is provided for professional users to use, and it is the standard of time division. FDMA is provided for civilian use and is a frequency division standard.

Compared with analog walkie-talkies, FDMA does not have much of an update experience for users, except that the channel spacing can be narrower (25kHz for analog and two or four time slots for digital) and a larger number of single-channel users.

Compared with analog walkie-talkies, TDMA walkie-talkies can not only have a larger single-channel user capacity, but also be able to relay at the same frequency. In the analog system, in order to realize the transfer, there must be a pair of receiving and sending frequencies. In the TDMA time division digital system, digital technology can be used to realize the transfer through the conversion of time slots.

For example, when the relay receives the data of slot A, the data that goes out at the same time is realized on slot B.

Now there is no own digital walkie-talkie standard in China. Now Motorola's digital walkie-talkies are in the TDMA standard, and the digital walkie-talkies of ICOM and Kenwood are in the FDMA standard.

Last year, China's own digital walkie-talkie alliance was established in Shenzhen, and it is stepping up the customization of China's own digital walkie-talkie standards. According to insiders, China's TDMA digital walkie-talkie standard may be led by Shenzhen Tianlitong Information Technology. The FDMA digital walkie-talkie standard may be led by Shenzhen HYT Company.

1.An inevitable trend in the digital age.

In the digital era, communication technology in the field of wireless communication is undergoing a transformation process from digital standards to replace traditional mode systems.

From smartphones and the Internet to radio intercom devices, digital technology has faded to become an integral part of contemporary life. In the context of the era of digital walkie-talkies, "analog revolution" has become an inevitable trend.

2.Better voice quality.

In traditional analog walkie-talkies, the voice quality often deteriorates with increasing distance.

In this regard, the digital walkie-talkie has obvious advantages over the analog walkie-talkie, and the voice quality of the digital walkie-talkie will not be significantly affected under the condition of weakening the same signal strength.

For example, the Beifeng TD300 digital walkie-talkie, which is based on digital DMR standard voice technology, has high signal sensitivity, which well overcomes the problems of intermittent call signals and voice distortion of analog products, and ensures clear and loud sound quality under complex conditions such as long distances and multiple building areas.

3.Save on communication costs.

The emergence of dual-mode digital walkie-talkies has saved the cost of upgrading communication equipment for traditional analog walkie-talkie users.

In addition, the digital dual-slot TDMA technology makes the traffic volume of the digital walkie-talkie twice as much as that of the analog one, which greatly saves the frequency application cost.

In addition to the above, gamers who are familiar with digital walkie-talkies know that digital walkie-talkies have clearer and louder voice quality, larger call volume, longer standby time, stronger anti-interference and richer functions. Therefore, the dual-mode digital intercom opportunity is a better option!

Abstract:Digital walkie-talkie is a digital walkie-talkie designed with digital technology. The digital walkie-talkie digitizes the voice signal and transmits it in the form of digital encoding, that is, all modulation on the transmission frequency of the walkie-talkie is digital.

Digital-pair cameras have the benefits of improved spectrum utilization, improved voice quality, and improved voice and data integration. So do you know what is the difference between a digital walkie-talkie and an analog walkie-talkie? Let's take a look at the relevant knowledge.

Advantages of digital walkie-talkies.

The first is that it can make better use of spectrum resources, similar to cellular digital technology, digital radios can load more users on a designated channel such as 25kHz, improving spectrum utilization, which is a solution to frequency congestion and has long-term significance.

The second is to improve the voice quality. Because digital communication technology has an in-system error correction function, compared with analog walkie-talkies, it can achieve better voice audio quality in a wider range of signal environments, and it will receive less audio noise and sound clearer.

The last point is to improve and improve the voice and data integration, change the weakness of the control signal with the increase of communication distance, 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 service integration is more complete and more convenient.

How to adjust the channel of the digital walkie-talkie.

1. Under normal circumstances, the right knob is the power switch and volume control button, and the clockwise power is turned on, and the volume will become louder and louder.

2. The middle knob is the frequency fine-tuning knob, which is the plus sign and the reverse is the minus sign.

4. The walkie-talkie needs to dock the frequency table, which needs the frequency table of the walkie-talkie 1---16 gears.

5. As long as the frequency setting is adjusted correctly, any walkie-talkie can talk.

The difference between digital walkie-talkie and analog walkie-talkie.

The traditional analog walkie-talkie is a communication mode that modulates voice, signaling, and signals to the carrier frequency of the walkie-talkie in a continuous wave mode, and optimizes the processing such as amplification. It has the advantages of mature technology, perfect system and relatively low cost.

The digital walkie-talkie is a digital communication mode that digitizes the voice signal, uses a specific digital coding method to mess with lead and a specific baseband modulation form, and uses a digital signal processor to optimize the digital communication mode. Compared with the traditional analog walkie-talkie, it has the significant advantages of strong voice anti-interference ability, high confidentiality, narrower channel occupation bandwidth, and stronger data transmission ability. It should be noted that walkie-talkies that use only digital control signals, such as trunking system walkie-talkies, are not considered digital walkie-talkies.

Analog digital walkie-talkie, how to communicate with ordinary analog walkie-talkie?

Even if the frequency point is the same in the simple digital mode and the analog mode, it is not common, take the DMR protocol walkie-talkie, assuming that the other is in the digital channel and the other is in the analog channel, the analog transmission, the digital machine can only see that the green light received is on, but there is no way to demodulate. When the digital machine is launched, the analog machine will only have a sudden system sound. There are many digital walkie-talkies that will say digital-to-analog compatibility on the function introduction, but what is the explanation of this digital-analog compatibility?

In fact, whether this walkie-talkie can receive digital and analog signals, everyone must look carefully: a walkie-talkie cannot receive digital and analog signals at the same time. To be more precise, in the same channel (channel), it is not possible to receive digital and analog signals at the same time, but the machine itself has the role of receiving analog and digital signals.

You can choose between two different channels (channels), write digital or analog frequencies, and then twist the knob to receive the digital or analog signal. So how to do the automatic switching of analog-to-digital ratio? That is to say, the same channel can receive both digital and analog signals without twisting the knob of the channel.

Walkie-talkie receives digital and analog frequencies in the same channel, technically speaking, it works but it is not easy to use, the current relatively popular way is that AD can be directly sampled after frequency conversion, followed by software radio, if you can solve the synchronous sequence code, it will be solved according to the number, if you can solve the subtone signal, it will be solved according to the analog. However, there are still a few problems: the bandwidth of analog and digital is not the same, which can slightly affect performance and cause some interference.

And not practical, because walkie-talkies are mainly for better conversations. When a group has both analog and digital, all analog is easier. If you use a repeater, it is much more reliable to connect a number and a calendar analog to each other in the background, and then program the analog into a digital group.

1. The transmission mode is different.

Analog walkie-talkie modulates the stored signal to the walkie-talkie transmission frequency, while digital walkie-talkie digitizes voice information and transmits it in the form of digital encoding, that is, all modulation on the transmission frequency of the walkie-talkie is digital.

2. There are differences in the utilization rate of spectrum resources.

Radio spectrum resources are not inexhaustible, and the scarcity of radio spectrum is deepening day by day compared to the ever-expanding demand for human use. Most digital walkie-talkies occupy a wide bandwidth equivalent to a voice channel, which can load more users on a designated channel and improve spectrum utilization.

3. There is a difference in call quality.

Because digital communication technology has an in-system error correction function, it can achieve better voice audio quality in a wider range of signal environments than analog walkie-talkies.

4. There are differences in voice and data integration performance.

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, and the integration of voice and data services is more complete and convenient.

1. The traditional analog walkie-talkie is a communication mode that modulates voice, signaling and signal to the carrier frequency of the walkie-talkie in a continuous wave mode and optimizes the processing after amplification, which has the advantages of mature technology, perfect system and relatively low cost.

Second, the digital walkie-talkie is a digital communication mode that digitizes the voice signal in a specific digital coding mode and a specific baseband modulation form, and uses a digital signal processor to optimize it.

First, spectrum resources can be better utilized. Similar to cellular digital technology, digital radios can load more users on a designated channel and improve spectrum utilization, which is a solution to frequency congestion.

Second, improve the call quality. Due to the in-system error correction function of digital communication technology, compared with analog walkie-talkies, it can achieve better voice audio quality in a wider range of signal environments, and it will receive less audio noise and sound clearer.

Third, the digital walkie-talkie improves and improves the integration of voice and data, and changes the weakness of the control signal that decreases with the increase of communication distance. 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 a two-way wireless communication base station structure, and the integration of voice and data services is more complete and convenient. With the development of radio communication technology, people's requirements for wireless communication quality and the increasing lack of spectrum resources, digital walkie-talkies will have a huge market demand.

The difference between their working characteristics lies in the first two words of the two things you asked, one is to use digital signal transmission, and the other is to use analog signal transmission. Because digital signals are easily processed by computers, the communication ability, function and quality of digital signals are much better than analog signals. That's the difference in their performance.

Just like today's mobile phones, like the original Big Brother, one uses a digital signal and the other uses an analog signal. The so-called digital signal is to encode the analog signal, just like the tape we used to listen to and the *** we listen to now

The effect is also obvious.

In terms of design technology, wireless communication products can be divided into:

Analog products: communication products that use analog technology to modulate the stored signal to the transmission frequency of the walkie-talkie for information dissemination and communication.

Digital products: communication products that use digital technology to digitize voice information and disseminate it in the form of digital encoding.

At present, MotoTRBO uses Time Division Multiple Access (TDMA) digital technology in digital walkie-talkies, Hytera also adopts TDMA dual time slot technology, and Beifeng uses DPMR and DMR digital trunking communication technologies. Hope it helps.

Analog walkie-talkie is a communication mode that modulates voice, signaling, and signals to the carrier frequency of the walkie-talkie in a continuous wave mode, and optimizes the processing such as amplification, while the digital walkie-talkie is a digital communication mode that digitizes the voice signal in a specific digital coding mode and a specific baseband modulation form, and uses a digital signal processor to optimize the data-based communication mode. Digital walkie-talkies have more advantages than analog machines, and DMR has become mature in the Chinese market, representing manufacturers such as Motorola, Hytera, Toppeng, etc.

The difference is that the digital communication is inaudible to the analog.

The difference between digital and analog video intercom The difference between digital and analog video intercom Building intercom technology is developing in the direction of digital technology, not only need to break through the bottleneck of technology, but also break through the bottleneck of its development. In the process of product promotion, it is necessary for the developer to recognize the product and understand what kind of value-added effect the system can bring to the owner. So, what is the difference between the digital video intercom system and the analog video intercom system?

Deficiencies of analog video intercom system At present, analog video intercom systems are used to transmit audio signals, and bus technology is generally used to transmit signals on common lines. This technical system has the following main problems: 1. Poor anti-interference ability, due to interference, there is often no signal or image, unclear sound and other phenomena; 2. The transmission distance is limited.

The analog signal is easy to attenuate and distort, and the amplifier should be added when the distance is long, not to mention the increase in the cost of networking, and the reductivity of the signal cannot be ensured; 3. There are many cases of bus technology being busy, because only two points are allowed to talk on the same bus; 4. Single function, in addition to supporting simple information release function, it is mainly limited to calling, unlocking and other functions, and the equipment utilization rate is low; 5. Due to technical reasons, product upgrading or expansion has great limitations; 6. The industry lacks standards, and the products of different manufacturers cannot be interconnected, and it is difficult to integrate with other weak electronic systems; 7. The amount of wiring engineering is large, the service cost is high, and it cannot be integrated into the community integrated network. These deficiencies of the analog video intercom system not only seriously affect the stability and reliability of the system, but also cannot meet the differences in functional needs between different ethnic groups. Driven by China's real estate market, the building intercom system has also been advancing all the way and has undergone new changes.

At present, the building intercom system has developed from the analog video intercom system to the digital video intercom system, which has made the entire industry present a new look. This article mainly analyzes the difference between digital video intercom system and analog video intercom system, and shares it with readers.