Kiyohiro Shikano


2006

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Transcription Cost Reduction for Constructing Acoustic Models Using Acoustic Likelihood Selection Criteria
Tomoyuki Kato | Tomiki Toda | Hiroshi Saruwatari | Kiyohiro Shikano
Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC’06)

This paper describes a novel method for reducing the transcription effort in the construction of task-adapted acoustic models for a practical automatic speech recognition (ASR) system. We have to prepare actual data samples collected in the practical system and transcribe them for training the task-adapted acoustic models. However, transcribing utterances is a time-consuming and laborious process. In the proposed method, we firstly adapt initial models to acoustic environment of the system using a small number of collected data samples with transcriptions. And then, we automatically select informative training data samples to be transcribed from a large-sized speech corpus based on acoustic likelihoods of the models. We perform several experimental evaluations in the framework of “Takemarukun”, a practical speech-oriented guidance system. Experimental results show that 1) utterance sets with low likelihoods cause better task-adapted models compared with those with high likelihoods although the set with the lowest likelihoods causes the performance degradation because of including outliers, and 2) MLLR adaptation is effective for training the task-adapted models when the amount of the transcribed data is small and EM training outperforms MLLR if we transcribe more than around 10,000 utterances.

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Long-term Analysis of Prosodic Features of Spoken Guidance System User Speech
Hiromichi Kawanami | Takahiro Kitamura | Kiyohiro Shikano
Proceedings of the Fifth International Conference on Language Resources and Evaluation (LREC’06)

As a practical information guidance system, we have been developing a speech-oriented system named "Takemaru-kun". The system has been operated on a public space since Nov. 2002. The system answers to user's question about the hall facilities, sightseeing, transportation, weather information around the city, etc. All triggered inputs to the system have been recorded since the operation started. And all system inputs during 22 months are manually transcribed and labelled for speaker’s gender and age category. In this paper, we conduct a long-term prosody analysis of user speech to find a clue to obtain user’s attitude from a user’s speech. In this preliminary analysis, it is observed that F0 decreases regardless of age and gender category when the stability of the dialogue system is not established.

2004

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Perceptual Evaluation of Quality Deterioration Owing to Prosody Modification
Kazuki Adachi | Tomoki Toda | Hiromichi Kawanami | Hiroshi Saruwatari | Kiyohiro Shikano
Proceedings of the Fourth International Conference on Language Resources and Evaluation (LREC’04)

2002

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Designing speech database with prosodic variety for expressive TTS system
Hiromichi Kawanami | Tsuyoshi Masuda | Tomoki Toda | Kiyohiro Shikano
Proceedings of the Third International Conference on Language Resources and Evaluation (LREC’02)

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Continuous Speech Recognition Consortium an Open Repository for CSR Tools and Models
Akinobu Lee | Tatsuya Kawahara | Kazuya Takeda | Masato Mimura | Atsushi Yamada | Akinori Ito | Katsunobu Itou | Kiyohiro Shikano
Proceedings of the Third International Conference on Language Resources and Evaluation (LREC’02)

2000

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IPA Japanese Dictation Free Software Project
Katsunobu Itou | Kiyohiro Shikano | Tatsuya Kawahara | Kasuya Takeda | Atsushi Yamada | Akinori Itou | Takehito Utsuro | Tetsunori Kobayashi | Nobuaki Minematsu | Mikio Yamamoto | Shigeki Sagayama | Akinobu Lee
Proceedings of the Second International Conference on Language Resources and Evaluation (LREC’00)

1994

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A Large-Vocabulary Continuous Speech Recognition Algorithm and Its Application to a Multi-Modal Telephone Directory Assistance System
Yasuhiro Minami | Kiyohiro Shikano | Osamu Yoshioka | Satoshi Takahashi | Tomokazu Yamada | Sadaoki Furui
Human Language Technology: Proceedings of a Workshop held at Plainsboro, New Jersey, March 8-11, 1994

1992

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Recent Topics in Speech Recognition Research at NTT Laboratories
Sadaoki Furui | Kiyohiro Shikano | Shoichi Matsunaga | Tatsuo Matsuoka | Satoshi Takahashi | Tomokazu Yamada
Speech and Natural Language: Proceedings of a Workshop Held at Harriman, New York, February 23-26, 1992

1990

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Neural Network Approach to Word Category Prediction for English Texts
Masami Nakamura | Katsuteru Maruyama | Takeshi Kawabata | Kiyohiro Shikano
COLING 1990 Volume 3: Papers presented to the 13th International Conference on Computational Linguistics