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 extension,  telephony speech,  full wave rectification, 
  Summary |  Full Text:PDF
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: 
steganography,  G.711,  VoIP, 
  Summary |  Full Text:PDF
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 enhancement,  band extension,  narrow-band speech,  wide-band speech,  steganography, 
  Summary |  Full Text:PDF
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: 
VoIP,  packet loss concealment,  pitch waveform replication,  pitch variation, 
  Summary |  Full Text:PDF
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: 
VoIP,  packet loss concealment,  pitch waveform replication,  steganography, 
  Summary |  Full Text:PDF
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 watermarking,  detecting alterations,  discrete Fourier transform (DFT),  number theoretic transform, 
  Summary |  Full Text:PDF
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 synthesis,  wavelet transform,  mixed excitation scheme,  random fractal fluctuation, 
  Summary |  Full Text:PDF
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: 1998/09/20
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 vowels,  speech synthesis,  random fractal,  1/fβ fluctuation, 
  Summary |  Full Text:PDF