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Masaoka K.,Tokyo Institute of Technology | Nishida Y.,Advanced Television Systems Research Division | Soeno T.,Advanced Television Systems Research Division | Yamashita T.,Advanced Television Systems Research Division | And 2 more authors.
SMPTE Motion Imaging Journal | Year: 2014

The wide-gamut system colorimetry for ultra-high definition television (UHDTV) specified in Recommendation ITU-R BT.2020 covers most real object colors. This paper introduces some practical spectral sensitivity curves for the wide-gamut system colorimetry, which is designed to approximate the ideal camera spectral sensitivity curves. The accuracy of color reproduction with such spectral sensitivity curves is demonstrated by computer simulation with a comprehensive database of natural object colors. Also, the accuracy of the color reproduction of a real UHDTV camera equipped with a newly developed dichroic prism is demonstrated. Copyright © 2014 by SMPTE.


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.


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.
Kyokai Joho Imeji Zasshi/Journal of the Institute of Image Information and Television Engineers | Year: 2012

This paper describes a miniaturization of a narrow-angle directional microphone that enables rear sensitivity to be significantly suppressed. The microphone assembly comprises of a line microphone capsule and a second-order pressure gradient directional microphone. This combination successfully reduced the residual rear sensitivity of conventional line microphones. The previously proposed microphone is too long to set in a small space. Therefore, the microphone is miniaturized by using small electret condenser microphone capsules, which are stacked in the small case, and by modifying the line microphone capsule's directivity to hypercardioid. The proposed microphone successfully suppresses rear sensitivity by more than 20 dB compared to the frontal sensitivity in the frequency range from 130 Hz to 2.5 kHz. Furthermore, it can be driven by a normal 48 V phantom power supply. Finally, the microphone was tested in several on-the-spot broadcasts, and it proved to be effective for practical use.


Yoo J.-H.,Electronics and Telecommunications Research Institute | Choi K.,Electronics and Telecommunications Research Institute | Seo J.,Electronics and Telecommunications Research Institute | Kang K.,Electronics and Telecommunications Research Institute | Okubo H.,Advanced Television Systems Research Division
41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012 | Year: 2012

For the next generation television such as 3DTV and UHDTV (Ultra High Definition TeleVision), audio also should be realistically represented corresponding to realistic 3D video or ultra high-resolution video. Therefore high-order (more than 5) multichannel systems with 3D loudspeaker arrangement are proposed to represent a realistic 3D sound scene. NHK's 22.2 multichannel audio system is a good example. However it can occur severe problem to install 24 loudspeakers at normal living room. This paper presents a different method, which represents high-order multichannel audio signal with a single loudspeaker array or several ones. If the rendering position of virtual loudspeaker image is within a loudspeaker array plane, we utilize a Wave Field Synthesis (WFS) method for accurate localization and wide sweet spot area. This paper presents the implementation procedure of loudspeaker array for reconstructing high-order multichannel sound (22.2 channels) and evaluation results though comparing with real loudspeaker arrangement environment.


Masaoka K.,Advanced Television Systems Research Division | Yamashita T.,Advanced Television Systems Research Division | Nishida Y.,Advanced Television Systems Research Division | Sugawara M.,Advanced Television Systems Research Division
SMPTE Motion Imaging Journal | Year: 2015

Ultrahigh-definition television (UHDTV) is a wide-color-gamut system, as standardized in Rec. ITU-R BT. 2020 and SMPTE ST 2036-1, that covers most real object colors and encompasses the gamuts of high-definition television (HDTV), Adobe RGB, and Digital Cinema Initiative Primary 3 (DCI-P3). The development of wide-gamut displays and high-quality gamut mapping is a major challenge in the workflow of UHDTV production today. While monochromatic light sources, such as lasers, are ideal for UHDTV wide-gamut displays, wide-gamut liquid crystal displays with nonmonochromatic backlight sources, such as quantum dot light-emitting diodes, may well be used from the viewpoint of both cost and performance. Furthermore, a highquality gamut mapping algorithm between UHDTV and HDTV for live broadcast production is essential. This paper offers solutions to these challenges. Copyright © 2015 by SMPTE.


Okubo H.,Advanced Television Systems Research Division | Sugimoto T.,Advanced Television Systems Research Division | Oishi S.,Advanced Television Systems Research Division | Ando A.,Advanced Television Systems Research Division
133rd Audio Engineering Society Convention 2012, AES 2012 | Year: 2012

NHK has been developing SUPER Hi-VISION (SHV), an ultrahigh definition TV system that has a 7,680 * 4,320 pixel video image and a 22.2 multichannel three-dimensional sound system. A loudspeaker array frame (LAF) integrated into a flat panel display can synthesize wavefront of frontal sound source and localize sound images on the display and back of the viewer by using technology to simulate sound propagation characteristics. This makes it possible to listen to 22.2 multichannel sound without installing 24 discrete loudspeakers surrounding the listener in the room. In this paper, we describe the prototype of the LAF and its performance focusing on frontal sound reproduction.


Sugimoto T.,Advanced Television Systems Research Division | Sugimoto T.,Tokyo Institute of Technology | Ono K.,Advanced Television Systems Research Division | Ando A.,Advanced Television Systems Research Division | And 2 more authors.
133rd Audio Engineering Society Convention 2012, AES 2012 | Year: 2012

To increase the sound pressure level of a flexible acoustic transducer from a dielectric elastomer film, this paper proposes compounding various kinds of dielectrics into a polyurethane elastomer, which is the base material of the transducer. The studied dielectric elastomer film utilizes a change in side length derived from the electrostriction for sound generation. The proposed method was conceived from the fact that the amount of dimensional change depends on the relative dielectric constant of the elastomer. Acoustical measurements demonstrated that the proposed method was effective because t he sound pressure level increased by 6 dB at the maximum.

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