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Sugimoto T.,Science and Technology Research Laboratories | Oode S.,Science and Technology Research Laboratories | Nakayama Y.,Science and Technology Research Laboratories | Okubo H.,NHK Engineering System Inc.
ITE Transactions on Media Technology and Applications | Year: 2015

A reproduction method for the 11 frontal channels of a 22.2 multichannel sound system (22.2 ch) over a direct-view display is investigated. NHK is planning to broadcast 8K Super Hi-Vision with 22.2 ch in a pilot broadcasting in 2016. A loudspeaker array frame has been developed for integration into the direct-view display as a home reproduction system and is used as a reproduction device of 22.2 ch. Localization of the frontal channels reproduced by the real loudspeakers is subjectively evaluated in terms of localization accuracy by estimating the difference from the intended localization for an 85-inch display. Three reproduction methods to synthesize the channels on the display are proposed and evaluated by comparison with a real loudspeaker placed at an exact channel position. Appropriate reproduction methods for the 11 frontal channels of 22.2 ch were decided from the results of a subjective evaluation. © 2015 by ITE Transactions on Media Technology and Applications (MTA).


Yamashita T.,Science and Technology Research Laboratories | Masaoka K.,Tokyo Institute of Technology | Ohmura K.,Hokkaido University | Emoto M.,Kyoto University | And 2 more authors.
SMPTE Motion Imaging Journal | Year: 2012

The crux of the move to ultrahigh-definition television is to simply deliver a wider field of view, which only requires an increase in pixel count to 3840 x 2160 or 7680 x 4320 pixels, which are well accepted standards. However, this overlooks important factors such as color/tone rendition and motion portrayal, which could be crucial to delivering an enhanced visual experience with next-generation television (next-gen TV) systems. To this end, system parameters are proposed including colorimetry and frame frequency for next-gen TV. The proposed colorimetry system is based on the real RGB color system and has a color gamut covering 99.9% of real surface colors while using physically realizable RGB primaries. Further, a frame frequency of 120 Hz is proposed on the basis of subjective assessments of motion picture quality.


Okano F.,NHK Engineering Services Inc. | Shishikui Y.,Science and Technology Research Laboratories
Proceedings of the IEEE | Year: 2012

Many engineers and researchers contributed towards the development of television since the successful experiments conducted by John Baird in the United Kingdom and Kenjiro Takayanagi in Japan in the 1920s. The research and development of television systems continued over the years culminating in the standardization of the NTSC, PAL, and SECAM formats as standard definition television (SDTV) systems. The motion picture, which was invented by the Lumiere brothers in 1895, has progressed dramatically since the invention of the television. It is now becoming possible to fabricate semiconductor devices, which form the basis of elemental technologies essential to video systems, at a submicrometer level of precision. If a new video system can be constructed exceeding the capabilities of HDTV, certainly it would bring many benefits in a wide range of fields. Science and Technology Research Laboratories has taken up the challenge of developing UHDTV as the system beyond HDTV, and it is called Super Hi-Vision.


Sugimoto T.,Science and Technology Research Laboratories | Oode S.,Science and Technology Research Laboratories | Nakayama Y.,Science and Technology Research Laboratories
AES: Journal of the Audio Engineering Society | Year: 2015

A downmixing method for a 22.2 multichannel sound signal that can provide a 2-channel signal via a 5.1-channel signal was investigated for 8K Super Hi-Vision broadcasting. The proposed downmixing method is composed of downmixing equations and initial downmixing coefficients optimized for transmission by MPEG-4 AAC. The proposed downmixing equations and initial downmixing coefficients were examined considering a tandem downmixing function that downmixes multichannel sound signals to 2-channel via 5.1-channel.Asubjective evaluation was carried out and the obtained result proved that the proposed method is suitable for the 22.2 multichannel sound broadcasting.


Kogo N.,Science and Technology Research Laboratories | Ikeda T.,Science and Technology Research Laboratories
2012 IEEE International Workshop on Antenna Technology, iWAT 2012 | Year: 2012

The antenna performance of a transceiver located in front of the human head was investigated with the main interest in the dependency on frequencies and the location of the antenna. We used a numerical approach for the investigation. We designed a helical antenna with a metallic case as a handheld type transceiver and calculated the radiation patterns of the antenna with a numerical human-body model. Moreover, the specific absorption rate (SAR) in a human body exposed to electromagnetic waves from the antenna is shown. © 2012 IEEE.


Misu T.,Science and Technology Research Laboratories | Matsuo Y.,Science and Technology Research Laboratories | Sakaida S.,Science and Technology Research Laboratories | Shishikui Y.,Science and Technology Research Laboratories
MM'10 - Proceedings of the ACM Multimedia 2010 International Conference | Year: 2010

We propose a novel super-resolution (SR) framework based on a sequential Monte Carlo (SMC) method, which is capable of robust optimization, for solving the inverse problem of degradation processes of imagery and sampling. The SR image is estimated from a set of multiple hypotheses, which are sequentially reorganized by evaluating their consistency with the input image. The concepts of norm regularization and motion registration in single/multi-frame SR are mapped into stochastic processes of an SMC's proposal distribution. The experiments showed that our framework is capable of seamlessly restoring both static and moving regions of degraded pictures. © 2010 ACM.


Sugimoto T.,Science and Technology Research Laboratories | Nakajima Y.,Science and Technology Research Laboratories
Acoustical Science and Technology | Year: 2016

Suppression of the second harmonic distortion intrinsic to a thermoacoustic transducer was studied using a square root circuit. The thermoacoustic transducer used in this study is composed of aluminum film, polyimide, and graphite film in order for it to be thin and bendable. A theoretical model was developed to calculate the radiated sound pressure on the basis of a fundamental equation for the heat transfer between the transducer and surrounding air. A square root circuit was designed to enable real-time signal processing and the effectiveness of the circuit regarding the second harmonic distortion suppression was experimentally confirmed. © 2016 The Acoustical Society of Japan.


Kogo N.,Science and Technology Research Laboratories | Ikeda T.,Science and Technology Research Laboratories
2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings | Year: 2013

The push-to-talk communication line for broadcasting services is used in the VHF band (165 MHz) and UHF band (460 MHz) in Japan. It is used for communication between staff during news gathering, television and radio program production, and so on. We designed a helical antenna with a metallic case as a handheld type transceiver and calculated the characteristics of the antenna with a numerical model of the human body. To investigate the effect of the human body on the performance of the antenna and the specific absorption rate on the human body, we calculated the antenna gain, radiation patterns and SAR when the antenna is in close proximity to the face. From these results, we propose using push-to-talk transceivers at a distance 'd' that is more than 100 mm from the view point of antenna gain and SAR. © 2013 IEICE.


Emoto M.,Science and Technology Research Laboratories
Neuro-Ophthalmology Japan | Year: 2010

Stereoscopic 3D imaging systems are now in practical use, which means that content creators and viewers need to be aware of the undesirable biomedical effects that are associated with these systems when changes are made in the sound developmental progress. In the present paper, we present factors and measurements on the unnaturalness of the images, viewing discomfort, and visual fatigue that results from viewing these stereoscopic images. These factors can be separated into two categories, the in-principle and the non-principle factors. In the non-principle category, these factors are related to differences in the characteristics of the left and right imaging equipment. As such, these factors can be eliminated, if so desired. The in-principle category factors are related to the horizontal binocular parallax, for which the degree needs to be carefully controlled. Although development continues to progress, there are significant issues that still need to be closely examined, and which include, the long-term undesirable biomedical effects, the potential effects on developing children, and the development of robust indices for visual fatigue.


Takahashi Y.,University of Tokyo | Miyamachi T.,University of Tokyo | Ienaga K.,University of Tokyo | Kawamura N.,University of Tokyo | And 3 more authors.
Physical Review Letters | Year: 2016

In scanning tunneling microscopy, orbital selectivity of the tunneling process can make the topographic image dependent on a tip-surface distance. We have found reproducible dependence of the images on the distance for a monatomic layer of iron nitride formed on a Cu(001) surface. Observed atomic images systematically change between a regular dot array and a dimerized structure depending on the tip-surface distance, which turns out to be the only relevant parameter in the image variation. An accompanied change in the weight of Fe-3d local density of states to a tunneling background was detected in dI/dV spectra. These have been attributed to a shift in surface orbitals detected by the tip from the d states to the s/p states with increasing the tip-surface distance, consistent with an orbital assignment from first-principles calculations. © 2016 American Physical Society.

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