NHK
Japan
NHK
Japan

Time filter

Source Type

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.


Ishii K.,NHK | Sugawara M.,NHK | Shishikui Y.,NHK | Ito T.,NHK
Proceedings of the International Display Workshops | Year: 2012

SUPER Hi-VISION (SHV) broadcast technology can transmit such realistic images and sounds that the viewers feel as if they are actually there. We have developed the broadcasting equipment necessary for the SHV system. We introduce an outline of an SHV public viewing using the latest technology of the London 2012 Olympic Games.


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.


Arai T.,NHK Science and Technical Research Laboratories | Kitamura K.,NHK Science and Technical Research Laboratories | Yonai J.,NHK Science and Technical Research Laboratories | Ohtake H.,NHK Science and Technical Research Laboratories | And 4 more authors.
IEEE Transactions on Electron Devices | Year: 2012

An ultrahigh-speed charge-coupled device (CCD) with an increased dynamic range at a frame rate above 200 kiloframes per second (kfps) was developed. The dynamic range of a CCD operating at extremely high speeds is reduced as a result of rounding of a sharp voltage waveform inside the device. The amount of rounding was estimated by using an equivalent circuit model of one kind of electrodes in a four-phase CCD memory. The simulation showed that the calculated voltage at a quarter period and the measured saturation signal level have similar dependence on the frame rate. To suppress the drop in voltage at a quarter period, the active pixels and the driving circuit were divided, and the resistance of the pixel wiring was reduced. A new ultrahigh-speed CCD, whose active pixels are divided into eight separately driven blocks and that employs dual wirings to each electrode of the four-phase CCD memory, was designed and fabricated. A driving evaluation experiment showed that the ultrahigh-speed CCD had a dynamic range of 48.6 dB at 1000000 fps. This range is equivalent to 8-bit digital and is 2.5 times higher than that of a previous ultrahigh-speed CCD. © 2006 IEEE.


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.


Ikeya K.,NHK | Mishina T.,NHK | Hisatomi K.,NHK | Iwadate Y.,NHK | Katayama M.,NHK
ACM International Conference Proceeding Series | Year: 2014

The main purpose of our research was to generate the bullet time of dynamically moving subjects in 3D space or multiple shots of subjects within 3D space. In addition, we wanted to create a practical and generic bullet time system that required less time for advance preparation and generated bullet time in semi-real time after subjects had been captured that enabled sports broadcasting to be replayed. We developed a multi-viewpoint robotic camera system to achieve our purpose. A cameraman controls multiviewpoint robotic cameras to simultaneously focus on subjects in 3D space in our system, and captures multi-viewpoint videos. Bullet time is generated from these videos in semi-real time by correcting directional control errors due to operating errors by the cameraman or mechanical control errors by robotic cameras using directional control of virtual cameras based on projective transformation. The experimental results revealed our system was able to generate bullet time for a dynamically moving player in 3D space or multiple shots of players within 3D space in volleyball, gymnastics, and basketball in just about a minute. System preparation in calibrating the cameras in advance was finished in just about five minutes. Our system was utilized in the "ISU Grand Prix of Figure Skating 2013/2014, NHK Trophy" live sports program in November 2013. The bullet time of a dynamically moving skater on a large skating rink was generated in semi-real time using our system and broadcast in a replay just after the competition. Thus, we confirmed our bullet time system was more practical and generic. Copyright 2014 ACM.


Yamashita T.,Ultrahiqh definilion TV Camera Systems | Kanazawa M.,NHK Science and Technology Research Laboratories STRL | Oyamada K.,NHK STRL | Hamasaki K.,NHK STRL | And 5 more authors.
SMPTE Motion Imaging Journal | Year: 2010

A report is present on the progress of research and development in the field of Super Hi-Vision (SHV), a UHDTV2 system as the highest class of UHDTV. The report covers the camera or display system and 22.2 multi-channel sound system, along with the delivery system, including the codec and transport technologies. It states that the rapid pace of technological progress has enabled researchers to develop a compact video and audio recording system and a prototype full 8K-resolution system. The transmission experiments using satellites and IP links and the standardization activity at ITU-R and SMPTE are also included in this report. The report reveals that research and development on SHV has focused on the system design and evaluation, prototype equipment, technological demonstrations, and standardization of the system parameters.

Loading NHK collaborators
Loading NHK collaborators