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Sugimoto T.,Science and Technology Research Laboratories | Nakayama Y.,NHK | Komori T.,Science and Technology Research Laboratories | Chinen T.,Sony Corporation | Hatanaka M.,Sony Corporation
AES: Journal of the Audio Engineering Society | Year: 2017

The 22.2 multichannel (22.2 ch) sound system is an advanced sound system composed of 24 channels three-dimensionally located in space to envelop listeners in an immersive sound field. This is the audio system for 8K broadcasting, which was launched in Japan in August 2016. To enrich the functionality of 8K broadcasting in addition to providing immersiveness, dialogue channel control for 22.2 ch sound broadcasting is proposed. The technology has two functions: dialogue enhancement, by changing the level balance between the channels for dialogue and those for background sound; and dialogue replacement, by selecting an alternative, preferred dialogue to replace the standard dialogue. The effectiveness of dialogue enhancement for 22.2 ch sound was verified by a subjective evaluation, with the results demonstrating the usefulness of this function for listeners. The dialogue channel control was constructed in the syntax of Moving Picture Experts Group (MPEG)-4 advanced audio coding (AAC) technology and has been approved as a domestic standard in Japan. © 2017.

Qda A.,Chiba Institute of Technology | Hirano Y.,NHK | Ishii K.,NHK
Proceedings of the International Display Workshops | Year: 2013

The 1-D fluid simulation of plasma display panel (PDP) discharges in Ne/Xe/N2 have been performed, in order to clarify the influence of N2 addition on discharge characteristics of AC PDPs in Ne/Xe(10%) gas mixture. Our simulations reveal that a delay time of the gap- voltage and discharge-current began to appear in case of N2 addition of more than 100 ppm. © 2013 ITE and SID.

Morita T.,NHK
Proceedings of the International Display Workshops | Year: 2013

To evaluate the fatigue caused by watching 3DTV under conditions that resemble typical viewing situations at home, we conducted experiments with 500 participants who watched 3D programs for approximately one hour on commercially available 3DTVs. This report describes the findings of fatigue caused by watching 3DTV based on these experiments. © 2013 ITE and SID.

Ryu H.,Hanyang University | Kim J.,Hanyang University | Aoki S.,NHK | Chung D.,University of Seoul
TVX 2017 - Proceedings of the 2017 ACM International Conference on Interactive Experiences for TV and Online Video | Year: 2017

Digital online advertising today is struggling to find the right way to reach consumers on new digital platforms. Advertisers like social-media platforms want to gather all sorts of data on each user's age, consumption patterns, interests and so on. This means ads could be aimed at them with an accuracy that is unthinkable with analogue media. However, social networks, TV advertisers who are interested in switching to the bran new field have yet to work out what is the optimal format for online and/or integrated ads. This workshop is aimed at dealing with these issues of how Asian markets would approach to this. © 2017 Copyright held by the owner/author(s).

Lim Y.,Samsung | Park K.,Samsung | Lee J.Y.,ETRI | Aoki S.,NHK | Fernando G.,ZTE
IEEE Multimedia | Year: 2013

There is no doubt that multimedia services over the Internet will be continuously and dramatically increased and transport-layer protocols of the various networks will converge to IP regardless of their characteristics. However, the current Internet architecture is not optimal for multimedia services, and current solutions for multimedia delivery over IP are not particularly efficient. Therefore, future networks, such as content-centric networks (CCNs), will not only provide a better network architecture for multimedia delivery, but will also require a multimedia transport solution that is better aware of requirements of the delivery network. MPEG Media Transport (MMT) will address such requirements, both by exposing the detailed information required by the underlying delivery layer that is agnostic to the specific media type and by defining an application layer protocol that is optimized for multimedia delivery. MMT is currently under development in MPEG and is expected to be published as an international standard in 2014. © 1994-2012 IEEE.

Sugimoto T.,Advanced Television Systems Research Division | Iwaki M.,NHK | Ono K.,Advanced Television Systems Research Division | Ando A.,Advanced Television Systems Research Division | And 3 more authors.
IEEE Transactions on Broadcasting | Year: 2010

A novel microphone that enables rear sensitivity to be significantly suppressed has been developed to improve open-air recording quality. Its assembly comprises a line microphone capsule and a second-order pressure gradient directional microphone. In conventional line microphones, residual rear sensitivity causes an influx of unexpected noise, especially at lower frequencies. Our microphone successfully suppresses rear sensitivity by more than 10 dB compared to conventional line microphones in the frequency range below 1 kHz in which major outdoor noise often occurs. Furthermore, it needs no complicated signal processing circuit and can be driven by a normal 48 V phantom power supply. Finally, our microphone was tested in on-the-spot broadcasts. Its rear sensitivity suppression proved to be effective for practical use, and its sound quality was found to be sufficient for use in TV programs. This paper describes the fundamental principle of the microphone's rear sensitivity suppression, the measurement results of its acoustic characteristics and field-test results obtained with it in on-the-spot broadcasts. © 2006 IEEE.

Murayama K.,NHK | Narikiyo Y.,NHK
ABU Technical Review | Year: 2011

Japan adopted the Integrated Services Digital Broadcasting- Terrestrial (ISDB-T) standard for digital terrestrial broadcasting, which began in December 2003 in the metropolitan areas of Tokyo, Osaka, and Nagoya. Currently, final preparation towards the termination of analogue broadcasting, in July 2011, is proceeding. The current ISDB-T system uses an OFDM scheme with a segment structure, using a single transmitted signal to realize Hi-Vision services for fixed reception and the One-Seg service for mobile reception. For a basic study of technology to increase capacity for the next-generation standard, we have prototyped a system based on ISDB-T, the current digital terrestrial broadcasting system, but expanding the carrier modulation scheme from 64QAM to 1O24QAM, and incorporating dual polarized MIMO transmission, which uses horizontally and vertically polarized waves simultaneously.

Tsushima Y.,NHK | Komine K.,NHK | Hiruma N.,NHK
Proceedings of the International Display Workshops | Year: 2012

It is known that luminance-contrast change is one of depth cues, however, little is known about the relationship between depth perception and display resolution. Here we examine how luminance-contrast smoothness correlates with depth perception. The results show that contrast smoothness can be used as one of depth cues, and it becomes a relatively effective depth cue even when luminance-contrast is subthreshold.

Tajima S.,NHK | Komine K.,NHK
Proceedings of the International Display Workshops | Year: 2012

We propose a novel methodology to analyze the universality of images, taking into account the diversity of color perception. It quantifies and visualizes expected information loss according to the notion of visual saliency. Psychophysical experiments indicated relationships between the model's predictions and subjective visual clarity.

Punchihewa A.,ABU Technology | Takechi M.,NHK Japan Broadcasting Corporation | Lee D.J.,Technical Research Institute | Sanei H.,NHK
ABU Technical Review | Year: 2015

The article addresses Integrated Broadcast-Broadband (IBB) Interactive multimedia services that are integrated with traditional broadcasting. The increasing penetration of the Internet and the increasing performance of broadband have stimulated interactive multimedia services that are not integrated with traditional broadcasting, known as Over-the-Top (OTT) services. IBB services give broadcasters the opportunity to establish a direct relationship with each member of the audience so that the entire service offering can be used to reduce churn by building brand loyalty.

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