No.122 July 2010

Research Presentations

  • Flexible Program Production System
    Shinya TAKEUCHI
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    Broadcasting operations have relied on VCR tape. Progress in hard disk and memory technology is prompting a move to file-based non-linear editing systems and program material transfer systems on IP networks. We are doing research on an advanced file-based production system that streamlines the production workflow. With this system, producers can easily access large amounts of program materials and edit decision lists from anywhere on the network. The systems image processing functions and capacity are scalable.
  • Millimeter-wave TV Camera ~Millimeter-wave Active Imaging System~
    Hirokazu KAMODA
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    We are developing a Millimeter-wave TV Camera that can image objects obscured by smoke or hidden behind obstacles such as wood. The frame frequency of the previous prototype was only 0.1 Hz, so we devised an electronically reconfigurable reflectarray antenna capable of rapid beam scanning. We experimentally confirmed that this antenna could electronically scan its beam and that the response time of the beamforming was short enough to meet the target frame frequency. After that, we constructed a new prototype camera incorporating the new antenna and conducted imaging tests showing that it had a frame frequency of 2.3 Hz. The camera could take images of slowly moving objects and could take clear images of subjects behind obstacles. The tests also showed that the reflectarray antenna was capable of electronic focusing.
  • A Full Resolution Super Hi-Vision Camera System
    Takayuki YAMASHITA
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    We developed a color camera system for ultrahigh definition TV(Super Hi-Vision)with three 33 M-pixel CMOS image sensors, a high-performance lens, and a signal processing unit. This camera can capture images at 60 frames per second(progressive scanning)The results of shooting experiments using this system showed that the modulation transfer function(MTF) characteristic was greatly improved from that of the previous SHV camera and the SN ratio was 48 dB.
  • Speech Recognition for Live Closed-Captioning
    Shinichi HOMMA
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    This paper describes three real-time closed-captioning systems using speech recognition that are in practical use and a new system under study. The first system employs the“direct method, ”whose input is the original program sound, and the second one in use employs the“re-speak method,”whose input is the speech rephrased by a“re-speaker”.The new system employs a hybrid method combining the“direct”and“re-speak”methods. This paper also describes approaches to improving the accuracy of spontaneous speech recognition in order to enlarge the number of closed-captioned TV programs.
  • Ultra-fine Spatial Light Modulation Device
    Kenji MACHIDA
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    Submicron spatial light modulators are promising for use in wide-viewing-angle holographic 3-D displays. We fabricated and evaluated a magneto-optical light modulation device driven by spin transfer switching. The major issues for practical use of the device are enlargement of the light modulation factor and low-current driving. We greatly improved a light modulation performance by using a Gd-Fe-based modulation layer and investigated the magneto-optical response of the Gd-Fe-based device. Two phased transitions of the magneto-optical response corresponding to the magnetization states were observed. This result suggests the possibility of multiple tones by means of spatial division. For low-current driving, magnetic tunnel junctions with perpendicular anisotropy were fabricated. The MgO(001)-oriented texture of the tunnel barrier, which enables the device to operate at a low current, was obtained by using a Tb-Fe-Co/Co-Fe-B based electrode.