In this paper, we report the overview of IPDC live-streaming system and the performance evaluation result. We have developed the IPDC system of delivering large multimedia files and of delivering small files of emergency information in real-time. We combined IPDC with MPEG-DASH and developed the live-streaming system by IPDC. As a result of the evaluation, we confirmed that it could deliver and receive DASH streaming file with forward error coding for live-streaming.
We developed a remote storage transmission system that automatically gathers high-quality video signals at the moment of an earthquake in best-effort IP network. The system achieves higher transfer rate and network bandwidth utilization efficiency using parallel TCP connections. We evaluated the transfer rate of the video signals and the required time from the trigger of earthquake information to the transmission completion of the video signals. The system achieved approximately 60 Mbps of transfer rate and approximately 12 seconds from the trigger of earthquake information to the transmission completion of the 1 minute video signal in actual FTTH network.
The experimental system which can provide a supplemental CG images using TVML (TV-program Making Language) has been developed. Rich CG contents were displayed at the second screen using a limited bandwidth of data-broadcasting. Moreover, the synchronization between terminals was performed by capturing a caption data, and CG model and the data of a set were obtained from the communication channel, and terms and conditions required for real-time CG images were examined. As a result of examination, since data efficiency was good and rich CG contents were displayed at the second screen in real time.
In this work, the evaluation of the performance degradation due to the presence of line-of-sight (LOS) component for an open loop multiple input multiple output (MIMO) system under Rician fading channel is presented. The bit error rate (BER) performance of 2×2 MIMO systems in terms of the Rician K factor for space time block coding (STBC) and spatial multiplexing schemes utilizing with minimum mean square error (MMSE) receiver are analyzed. Monte Carlo simulation technique is used to simulate the channels and show the validity of the performance analysis. Dual-polarized diversity and multiplexing schemes are also evaluated to compare their performance in LOS MIMO environments. The tradeoff between multiplexing gain in dual-polarized multiplexing scheme and system robustness in STBC scheme is given in LOS scenario.
The bit rate of a 22.2 multichannel sound (22.2 ch) signal meeting broadcast quality was investigated by performing a subjective evaluation. 22.2 ch is currently planned to be transmitted by MPEG-4 AAC (advanced audio coding) in 8K Super Hi-Vision broadcast. A subjective evaluation of the basic audio quality of a coded 22.2 ch signal was carried out using 49 stimuli made from a combination of seven bit rates and seven contents. A bit rate meeting broadcast quality was found to be about 1.2 Mbps from the obtained results.
In Japan, Super Hi-Vision (SHV) satellite broadcasting test services are planned to begin in 2016 and commercial services are scheduled in 2020. NHK has been studying technologies for the SHV systems and standardized schemes including a new media transport scheme based on MMT and schemes for multimedia services. This paper describes a new subtitle scheme based on TTML and a new data transport scheme for multimedia services which are standardized as ARIB specifications and describes example services using proposed schemes.
We compare other scheme with the MMT-based application transmission scheme in Super Hi-Vision satellite broadcasting. We also evaluate the performance of it by software implementation. As a result, we show that Media Processing Unit (MPU) mode of MMT protocol is suitable for application transmission scheme, and is able to transport files like data carousel transmission in the current digital broadcasting. And, we also describe that two management tables function as separating directory layouts of production and transmission, and acquisition time shortened by increasing the maximum size of the transport packets.
This paper reports on two kinds of video transmission experiment over Research and Education Networks. 8K video signals were transported from London, U.K. to Tokyo, Japan, connecting IP networks in several countries and districts. Echocardiographic images for remote medical seminar were distributed from Tokyo to Universities in Japan using SINET4 to spread the latest medical technology in the district.