Compared to building intercom, Internet telephony can be said to have been in our life applications for a short time. In summary, Internet telephony refers to a system for voice communication in a computer network that uses IP as a network layer protocol. The technology that it uses is collectively referred to as VoIP (Voiceover IP), that is, the transmission of voice over a network. Technically speaking, IP network telephony is the result of the integration of two mainstream technologies, namely network packetization marked by IP and integrated network services targeted by multimedia. With the improvement of network construction, the network environment has been continuously improved. The boundaries between computers and telecommunications have also been gradually broken down. Therefore, Internet telephony was born in this fusion.
For the network video phone, it has the characteristics of low price, flexible service, and easy internal communication. At the same time, it also has great help for the integration of new technologies. In the network call, its voice processing mainly solves two problems, namely, maintaining the call quality as much as possible to reduce the encoding bit rate. The second is to ensure certain call quality under the ip network environment. The introduction of video links is an addition to a technology that guarantees audio transmission.
Although using the IP network to achieve video transmission work. However, they have a little different.
Ip Video Intercom, also known as full digital intercom, is a digital product evolved from the original bus-based
Video Intercom System. The
Ip Video Intercom System adopts the latest digital audio and video compression, DSP, embedded and streaming media network transmission technologies, combined with the characteristics of the home intelligent gateway system, uses the local area network of the cell to transmit audio and video over the network, and in addition to the video In addition to the transmission, it can also complete the alarm, access control, and smart home appliance control work.
From the above analysis, we can see that although they have small differences in some functions, they all can satisfy our pursuit of video communication at different ends. So does this commonality mean that they can achieve simpler integration between the two? Let's make a simple analysis below.
Communication model differences
Although it has a very close function. But in terms of implementation, their differences can be really small. For Internet telephony, its communication process is mainly based on computers and computers, telephones and telephones, or between computers and VoIP phones. The network video intercom mainly exists at the door host and each extension, or some special regional security management systems such as the management center and indoor extensions. Despite the fact that they belong to video communications, the difference between their service terminals is still very obvious. This leads to more different directions in the specific use of technology.
Transmission path differences
In addition to the difference in the terminal, the signal also has a significant difference in the transmission path. For IP network phones, it pays more attention to voice communication between network devices, while video intercom is more focused on the transmission of control signals between LANs. Therefore, if the network videophone is to be used for signal control of a device, its limitation on the type of signal transmission is still very strong.
Differences in audio and video quality
In the transmission process of audio and video, the network videophone considers more of the effect of bandwidth. Due to the different network environments, this type of transmission is more of a necessity for audio and video quality and network transmission environments. Therefore, under such demand, high compression has become an indispensable processing link for the network videophone. However, a high proportion of compression will inevitably lead to a decline in the quality of audio and video. Therefore, if you want to maintain high-quality audio and video effects on a network video phone, it is still very difficult from the current technology.
Because of the video intercom in the transmission, due to the use of audio and video single-line quality, so in the LAN transmission, the video quality will be much better. However, there is a lack of processing equipment such as video telephony on the issue of echo. Therefore, in the sound quality, the trouble caused by the echo is still very difficult to do.
Differences in use requirements
In addition to the differences caused by the technical factors, the difference between the user's VoIP and video intercom is also very large. For Internet telephony, users pay more attention to audio and video transmission capabilities in their applications. More specifically, it should be the transmission capability of audio, that is, the biggest role of Internet telephony is to build a bridge for users to communicate.
For video intercom, it is more of an exchange for security management and communication. For example, the front-end
Access Control System, cell broadcast transceiver, security system alarms and so on. The relatively low-quality picture quality of the Internet telephony work is to some extent an unbearable aspect in security applications.
From the analysis above, we can see that the difference between video intercom and Internet telephony is very large, both in terms of technology and application requirements. However, due to the huge cost difference between Internet telephony and network video intercom, many manufacturers have ported their telephony technology almost unchanged to video intercom applications, although such changes are cost-effective. Has a lot of innovation, but the side effects for security work is enormous, and sometimes there is a kind of "donkey lips not horse mouth" feeling in use.
