Naofumi AOKI


A Band Extension Technique for Narrow-Band Telephony Speech Based on Full Wave Rectification
Naofumi AOKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/03/01
Vol. E93-B  No. 3  pp. 729-731
Type of Manuscript:  LETTER
Category: Network
Keyword: 
band extensiontelephony speechfull wave rectification
 Summary | Full Text:PDF(654.5KB)

A Technique of Lossless Steganography for G.711
Naofumi AOKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/11/01
Vol. E90-B  No. 11  pp. 3271-3273
Type of Manuscript:  LETTER
Category: Network
Keyword: 
steganographyG.711VoIP
 Summary | Full Text:PDF(365.4KB)

A Band Extension Technique for G.711 Speech Using Steganography
Naofumi AOKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/06/01
Vol. E89-B  No. 6  pp. 1896-1898
Type of Manuscript:  LETTER
Category: Network
Keyword: 
speech enhancementband extensionnarrow-band speechwide-band speechsteganography
 Summary | Full Text:PDF(600.7KB)

Modification of Two-Side Pitch Waveform Replication Technique for VoIP Packet Loss Concealment
Naofumi AOKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/04/01
Vol. E87-B  No. 4  pp. 1041-1044
Type of Manuscript:  LETTER
Category: Network
Keyword: 
VoIPpacket loss concealmentpitch waveform replicationpitch variation
 Summary | Full Text:PDF(581.5KB)

A Packet Loss Concealment Technique for VoIP Using Steganography
Noriko KOMAKI Naofumi AOKI Tsuyoshi YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/08/01
Vol. E86-A  No. 8  pp. 2069-2072
Type of Manuscript:  Special Section LETTER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
VoIPpacket loss concealmentpitch waveform replicationsteganography
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A Fragile Digital Watermarking Technique by Number Theoretic Transform
Hideaki TAMORI Naofumi AOKI Tsuyoshi YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/08/01
Vol. E85-A  No. 8  pp. 1902-1904
Type of Manuscript:  Special Section LETTER (Special Section on Digital Signal Processing)
Category: Image/Visual Signal Processing
Keyword: 
digital watermarkingdetecting alterationsdiscrete Fourier transform (DFT)number theoretic transform
 Summary | Full Text:PDF(283.1KB)

High Quality Speech Synthesis Based on the Reproduction of the Randomness in Speech Signals
Naofumi AOKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/09/01
Vol. E84-A  No. 9  pp. 2198-2206
Type of Manuscript:  Special Section PAPER (Special Section on Nonlinear Theory and its Applications)
Category: Image & Signal Processing
Keyword: 
rule-based speech synthesiswavelet transformmixed excitation schemerandom fractal fluctuation
 Summary | Full Text:PDF(581.1KB)

Fractal Modeling of Fluctuations in the Steady Part of Sustained Vowels for High Quality Speech Synthesis
Naofumi AOKI Tohru IFUKUBE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/09/25
Vol. E81-A  No. 9  pp. 1803-1810
Type of Manuscript:  Special Section PAPER (Special Section on Nonlinear Theory and Its Applications)
Category: Chaos, Bifurcation and Fractal
Keyword: 
naturalness of sustained vowelsspeech synthesisrandom fractal1/fβ fluctuation
 Summary | Full Text:PDF(753.6KB)