2012 Fiscal Year Final Research Report
Audio Coding Based on Amplitude Spectrogram Quantization and Phase-reconstruction Decoding
| Project/Area Number |
23650083
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Perception information processing/Intelligent robotics
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| Research Institution | National Institute of Informatics |
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Principal Investigator |
ONO Nobutaka 国立情報学研究所, 情報学プリンシプル研究系, 准教授 (80334259)
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| Co-Investigator(Kenkyū-buntansha) |
SAGAYAMA Shigeki 東京大学, 情報理工学(系)研究科, 教授 (00303321)
KAMAMOTO Yutaka 日本電信電話株式会社NTTコミュニケーション科学基礎研究所 (00418550)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 音声情報処理 / 音響信号符号化 |
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| Research Abstract |
In this project, aiming to a new high-quality audio coding, our achievements can be summarized as follows. 1) We developed "the range-constrained phase reconstruction" technique, which is a method to synthesize well-quality time-domain signal from quantized amplitude and phase spectrogram. 2) We developed a method to automatically estimate repetitive structure of audio signals, which can be typically observed in music spectrogram, with minimum coding-length criterion, and 3) We developed a robust audio watermarking method, which embeds the information to phase spectrogram of stereo audio signals, utilizing the fact that human auditory system is not much sensitive to phase.
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