Reduction of noise level by SPAD (speech processing system by use of auto-difference function). - Nobuyuki Kunieda; Tetsuya Shimamura; Jouji Suzuki; Hiroyuki Yashima (ICSLP, 1994)

Robust method of measurement of fundamental frequency by ACLOS: autocorrelation of log spectrum. - Nobuyuki Kunieda; Tetsuya Shimamura; Jouji Suzuki (ICASSP, 1996)