统一通信系统

M2M communication control system

如何识别您的沟通合作伙伴？

传统的视频会议系统以ISDN为前提，使用电话号码作为指定通信伙伴的标识符。使用IP网络而不是通过电话号码，通信伙伴由IP地址指定。然而，IP地址不能用作电信号的半永久标识符，因为当视频会议终端移动到不同的位置并与另一网络连接时，IP地址可以改变。

If the IP address is changed, the originating side can start, but the IP address of the partner may have changed. If that happens, connection itself is possible, but the originator may be connected to an unexpected party. If the originator knows the IP address of the communication partner in advance, the problem is solved, but that doesn't solve the problem of destination lists, because the lists should be revised whenever IP addresses change. The problem is still not solved.

Simple and secure connection by an original M2M communication control technology

M2M is the abbreviation for Machine-to-Machine; it is the basic technique for devices to work with each other by exchanging events or to acquire the status of other devices. This technology makes it possible to “control devices remotely,” which was difficult. It also makes it possible to “monitor operation status” and to “recover automatically when a fault occurs.” Ricoh investigated M2M communication control technology for many years to make varied devices work together and to manage devices remotely. Ricoh established a unique method.

The communication module of the wireless carrier is generally used in M2M communication. The Ricoh M2M platform (Figure 1) manages individual devices without requiring a special communication module while using cloud technology. This made it possible for us to develop the portable remote video communication system efficiently as a cloud application.

Figure 1: Schematic diagram of M2M platform

当每个视频会议终端都可以在云上控制时，用户可以轻松地将其连接到会议的另一侧，就像传统电话一样。即使IP地址移动终端移动时，CID（Contact ID）也不会改变。地址列表每次都不需要编辑。连接很容易？随时随地。

Page Top

Video codec technology H.264 SVC

Dealing with unstable networks

In conventional video conferencing systems, the transfer rate (throughput) and zone needed to hold the conference are determined before the conference begins. On the Internet, however, the “best-effort connection” is generally adopted and the throughput continually changes. With the proliferation of wireless networks in recent years, still bigger changes than with wired connections are observed. When the change exceeds the throughput decided when the conference starts, things are fine. But if it goes below, quality may deteriorate to the point that “video stops” and “voice is interrupted.” In the worst case, disconnection may occur, disrupting the conference. On the other hand, if the throughput is set low to avoid quality deterioration and disconnection, the entire conference suffers lower quality.

We need to send and receive quality video and voice on unstable networks, as is the case with wireless communications. This is crucial if we are to provide “communication at anytime, anywhere, for anyone and with anyone” without stress.

Uninterrupted communication with a new video codec technology

As a standard for sending and receiving video under unstable network environments, H.264 SVC^(*1)引起了很多关注。SVC是可伸缩视频编解码器的缩写，并且是一种正式称为“H.264 / SVC附件G.“

在H.264 SVC中，视频分为要编码的多个质量，然后通过多个通道发送和接收。当由于填充网络或不良无线状态而无法确保足够的吞吐量时，控制工作以切割高质量的视频信道并发送和接收较低的质量信道。即使这个控件导致网络吞吐量波动和窄，即使可以继续显示低质量的视频。

图2：使用H.264 SVC的视频传输和接收方面

With H.264 SVC, the problems resulting from interruption and disconnection are greatly alleviated, even in severe wireless environments where changes of zone are intense. In overcoming the limitations of time and space to achieve stable transmission and reception of video in wireless connections, we made smooth communication possible by combining the M2M platform and H264 SVC. We did so by capitalizing on the advantages of mutual technology.

(*1)

H.264 SVC is an innovative architecture developed by Vidyo of the U.S.

排序 ：field“Network”| product type“视频和网络会议系统”