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Dive into the research topics where Kengo Fujita is active.

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Featured researches published by Kengo Fujita.


international conference on human-computer interaction | 2011

Design and Development of Eyes- and Hands-Free Voice Interface for Mobile Phone

Kengo Fujita; Tsuneo Kato

This paper describes the design and development process of our new eyes- and hands-free interface which provides the fundamental functions of a mobile phone by voice interaction through a Bluetooth headset. We first identify four conditions which must be met in order to make the interface acceptable to Japanese users. Next, we define design guides which address each of these conditions. In accordance with the design guides, we propose and implement the interface system. To assess the effectiveness of the proposed interface, we had participants operate a mobile phone while walking while simultaneously confirming a switching signal which either permitted or forbade them to walk. The experimental results showed that the proposed interface was more effective than the conventional interfaces for operating a mobile phone while simultaneously performing other tasks. The participants pointed out some problems during the interviews, and we address these problems.


international conference on acoustics, speech, and signal processing | 2010

An efficient beam pruning with a reward considering the potential to reach various words on a lexical tree

Tsuneo Kato; Kengo Fujita; Nobuyuki Nishizawa

This paper presents an efficient frame-synchronous beam pruning for automatic speech recognition. With conventional beam pruning, hypotheses that have a greater potential to reach various words on a lexical tree are likely to be pruned out, since this potential is not taken into account. To make the beam pruning less restrictive for hypotheses with a greater potential and vice versa, the proposed method adds a reward as a monotonically increasing function of the number of reachable words from the node where a hypothesis stays on a lexical tree, to the likelihood of the hypothesis. The reward is designed not to collapse the ASR probabilistic framework. The proposed method reduces the processing time from 30% to 70% for grammar-based tasks. For a language-model-based dictation task, it also causes an additional reduction from the processing time of the beam pruning with the language model look-ahead technique.


Archive | 2007

VOICE RECOGNITION DEVICE AND ITS UTTERANCE DETERMINATION METHOD, AND UTTERANCE DETERMINATION PROGRAM AND ITS STORAGE MEDIUM

Kengo Fujita; Tsuneo Kato; Hisashi Kawai; 恒夫 加藤; 恒 河井; 顕吾 藤田


IEICE Transactions on Information and Systems | 2011

Efficient Beam Pruning for Speech Recognition with a Reward Considering the Potential to Reach Various Words on a Lexical Tree

Tsuneo Kato; Kengo Fujita; Nobuyuki Nishizawa


conference of the international speech communication association | 2005

SNR-dependent background noise compensation of PESQ values for cellular phone speech.

Kengo Fujita; Tsuneo Kato; Hideaki Yamada; Hisashi Kawai


Transactions of Japan Society of Kansei Engineering | 2016

Case Study: Service and Application Design using Good Memories

Tomonori Yazaki; Kengo Fujita; Oulen Tumur; Shinya Nagashio; Kazuhiko Yamazaki


Transactions of Japan Society of Kansei Engineering | 2016

Case Study: Improvement of Mobile Phone Shops based on Behavior Observation

Tomonori Yazaki; Kengo Fujita; Yoshihiko Takagi; Sumaru Niida


電子情報通信学会技術研究報告. HCS, ヒューマンコミュニケーション基礎 | 2014

Designing a Breeding Game with Spoken Dialogue Interface (ヒューマンコミュニケーション基礎)

Xin Xu; Kengo Fujita; Tsuneo Kato; Fumiaki Sugaya


mobile and ubiquitous multimedia | 2014

Hey Peratama : a breeding game with spoken dialogue interface

Xin Xu; Jianming Wu; Kengo Fujita; Tsuneo Kato; Fumiaki Sugaya


Archive | 2014

Mediation device, mediation user terminal, mediation method, and program

顕吾 藤田; Kengo Fujita

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Tsuneo Kato

University of Southern California

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Hisashi Kawai

National Institute of Information and Communications Technology

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Kazuhiko Yamazaki

Chiba Institute of Technology

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Daichi Aoki

Chiba Institute of Technology

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Eichi Shibata

Chiba Institute of Technology

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Kazuhiro Kimura

Chiba Institute of Technology

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Kazuma Obata

Chiba Institute of Technology

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Leo Wakiya

Chiba Institute of Technology

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