IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
Volume 4 , Issue 18
Showing 1-3 articles out of 3 articles from the selected issue
LETTER
  • Akira Tada, Hiromi Notani, Genichi Tanaka, Takashi Ipposhi, Masaaki Ii ...
    2007 Volume 4 Issue 18 Pages 562-568
    Published: 2007
    Released: September 25, 2007
    JOURNALS FREE ACCESS
    An important issue with MTCMOS circuits is the energy consumption for charging virtual P/G lines during the sleep/active mode transitions. Charge recycling is an effective technique to reduce it. We propose a technique to reuse more charge by dividing a circuit into several blocks, where the charge is transferred between the properly selected pairs. Assuming ideal situation, we can improve the energy saving ratio up to 63.6% from 50%. Our scheme uses the additional control circuit employing only a delay circuit to minimize the power overhead. The proposed method has improved the ratio by 10.0%, and total power by 7.1%.
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  • Soo-young Suk, Hiroaki Kojima
    2007 Volume 4 Issue 18 Pages 569-574
    Published: 2007
    Released: September 25, 2007
    JOURNALS FREE ACCESS
    In this paper, we consider that non-voice inputs such as coughing and breathing and spark-like mechanical noise should be rejected and that the system must recognize speech commands affected by disability, including specific pronunciation speed and frequency, to achieve a system that can operate powered wheelchairs safely using a severely disabled person's voice in a real environment. We therefore propose inarticulate speech recognition using a multi-template dictionary to cope with the pronunciation variation and perform non-voice rejection using both YIN-based fundamental frequency extraction and reliability in preprocessing.
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  • Hideaki Fujimoto, Kazuhito Murakami, Shoichi Kitazawa
    2007 Volume 4 Issue 18 Pages 575-581
    Published: 2007
    Released: September 25, 2007
    JOURNALS FREE ACCESS
    The purpose of this paper is to present various equivalent circuits of the coupled square-loop resonator which can be used for realization of narrow bandstop filters like notch filters. Furthermore, it is made clear that those circuits vary by the relation of characteristic impedances of component lines in the resonator.
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