This device is a signal generator corresponding to ISDB-Tmm of multimedia broadcast system for portable devices, ISDB-T and ISDB-. Tsb of the terrestrial. TmmXpress. ISDB-Tmm signal generator software. TmmXpress is the ISDB-Tmm test-signal generator. The intuitive and easy to use graphical user interface lets. The ISDB-Tmm broadcasting system is an expansion of the ISDB-T (T: terrestrial) system [2], [3] being used for terrestrial digital TV broadcasting and provides a.

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You need Adobe Reader 7. If Adobe Reader is not installed on your computer, click the button below and go to the download site. This article briefly explains the multimedia broadcasting service for mobile terminals planned to start in Japan in springafter the frequency band currently used for terrestrial analog broadcasting became available in Julyand the technology that will support it.

This service is based on the ISDB-Tmm integrated services digital broadcasting, terrestrial mobile multimedia system.

As major features, the system makes use of the excellent mobile reception of terrestrial digital TV and offers extended capabilities such as improved video quality, the transfer of various kinds of large files such as video and voice, and interworking with communication functions.

The main divisions in the system configuration are the broadcasting system and the information system.


Multimedia broadcasting concept and system configuration. In Septemberthe Ministry of Internal Affairs and Communications authorized Multimedia Broadcasting mmbi [4] as a consignment broadcaster explained below using a framework that separates hardware and software in the implementation of multimedia broadcasting in the form of consignment broadcasting and consigned content broadcasting [5].

Consignment broadcasters and content consigning companies. A broadcasting content consigner creates and organizes the programming, performs authentication, and handles charges and settlement as well as the broadcasting work for delivering the program; a consignment broadcaster broadcasts the data received from the consigner nationwide. Of the frequency band opened up by the ending of analog broadcasting 90— MHz33 segments for nationwide broadcasting Services that are provided by multimedia broadcasting are broadly classified as those provided by realtime systems and those provided by stored content systems Fig.

Services provided by multimedia broadcasting. Realtime broadcasting services involve program viewing at the time of the broadcast. That is to say, realtime broadcasting can be regarded as corresponding to the one-segment broadcasting One-Seg offered for cell phones and mobile terminals, but multimedia broadcasting extends that service in the ways described below.

The quality of video in multimedia broadcasting supplements the One-Seg specification with three additional schemes Table 1. Thus, even video that contains fast motion can be viewed clearly, and viewing with sufficient image quality is possible on large-screen tablets and smart phones and even on larger external displays that have HDMI high-definition multimedia interface as well as on conventional cell phones.


One-Seg broadcasting also provided functions for interworking with various media, initiated by a TV program. Nevertheless, that system was focused on TV, and the interworking with other media was not necessarily active.

Service and Technology Overview of Multimedia Broadcasting for Mobile Terminals

In multimedia broadcasting, on the other hand, communication-derived content offered via a communication function is handled with relative freedom by the receiver. Multimedia broadcasting also inherently involves two different types of broadcasting system realtime and stored.

Because of those and other such factors, the system is being extended in the direction of improved interworking with One-Seg, multimedia broadcasting both realtime and storedand communication-derived content, etc. In other words, the communication function can be considered to be a standard function of multimedia broadcasting receivers. To take fullest advantage of that feature, the system is being configured to deliver broadcast content and communication-derived content through seamless interworking.

Service provision by file-based broadcasting differs from realtime broadcasting in that the time scheduling and duration of viewing or use of the content is isbd the same as the scheduling and duration of the broadcast. That is to say, as the term file-based indicates, the service assumes that iscb receivers receive and temporarily store the broadcast content before it is actually viewed or used. Tmn, good content viewing or use can be expected even in locations that have poor reception of broadcast waves, such as underground areas or inside buildings.

The content that is received and stored is in the form of ordinary files that are widely used by personal computers, so e-books, games, and various other types of content that cannot be handled by conventional broadcasting can be provided as well as video and audio.

Because services can be premised on the receiver having a communication function, as mentioned above, services that are highly aware of interworking with the communication function are being planned.

A major feature of file-based broadcasting is that any file can be delivered in a broadcast. To implement that feature, the protocol stack shown in Fig. This transmission system has an application-layer forward error correction AL-FEC function that provides powerful error correction that can handle data loss over an extended time period—something that is difficult for the FEC function of the radio physical layer.

Multimedia broadcasting protocol stack.

Although multimedia broadcasting uses powerful error correction isdg overcome errors in the received data caused by deterioration of broadcast reception conditions, if the limits of that function are exceeded e. Stored content complementation technology. File-based broadcasting differs from the conventional TV broadcasting service in that there is no concept of channels or scheduled times.


On the other hand, file-based broadcasting requires content tmmm management, for example, prior to broadcasting, during storage, and of viewable usable content, which is not required by the previous form of TV broadcasting. This includes various types of information about individual programs and other items of content in the XML extensible markup language format that can be used by the receiver to present the user with information about content in a way that is easy to understand. Multimedia broadcasting differs from the One-Seg service in that it assumes a charged broadcasting model.

In other words, it must be possible to permit content viewing use by users who pay a charge, but restrict viewing by users who do not pay the charge. Content protection and access control iadb fulfills that requirement. The main feature of the content protection and access control technology for multimedia broadcasting, as shown in Fig. Another feature is the use of a stronger encryption algorithm than is used for previous digital broadcasting.

Content protection and access control. Multimedia broadcasting takes advantage of the many excellent features of the current terrestrial digital TV and further improves content quality, offers a file-based broadcasting service, and achieves content diversification through interworking with the communications function.

An even greater variety of functional extensions is planned for the future. The other Feature Articles in this set introduce metadata technologies in multimedia broadcasting for mobile terminals [7], access control in multimedia broadcasting for mobile terminals [8], and storage-based broadcasting in multimedia broadcasting for mobile terminals [9]. Iddb multimedia broadcasting system for mobile terminals and specifications for multimedia broadcasting for mobile devices.

ISDB – Wikipedia

It supports stored content in addition to the viewing of realtime video. He received the B. He joined NTT in He moved to mmbi in His main research interest is currently multimedia signal processing and the quality-of-service architecture for fourth-generation 4G mobile communications networks.

He has been engaged in business planning in the area of broadcasting businesses. He joined Nippon Telegraph and Telephone Public Corporation now NTT in as a researcher and investigated the solid-state physics of thin-film heads, ymm key technology in the development of high-capacity magnetic storage devices. Inhe was responsible for the design and development of an electronic isdg system for video-on-demand. His main achievements are managing the tmmm of an online shopping system, the video distribution system, and a comic delivery system for mobile phones.

His specialty is forward error correction systems. He moved to his current department in July