1. H. Takeda, D. Ando, S. Sakauchi, S. Onishi, and H. Jozawa, “Functions of PC Communicator: PC-to-FOMA IP Videophone Technology,” NTT Technical Review, Vol. 3, No. 10, pp. 18–24, 2005.
https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200510018.pdf
2. S. Sasaki, T. Mori, Y. Hiwasaki, and H. Ohmuro, “Global Standard for Wideband Speech Coding (G.711 wideband extension),” NTT Technical Review, Vol. 6, No. 8, 2008.
https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200808le1.html
3. S. Sakauchi, Y. Haneda, M. Okamoto, J. Sasaki, and A. Kataoka, “Echo Canceller with Noise Reduction Provides Comfortable Hands-free Telecommunication in Noisy Environments,” NTT Technical Review, Vol. 2, No. 3, pp. 59–63, 2004.
https://www.ntt-review.jp/archive/ntttechnical.php?contents=ntr200403059.pdf