Low-delay subband CELP coding for wideband speech
W.S. Tian, Wai‐Choong Wong, C. Tsao · IEE Proceedings - Vision Image and Signal Processing · 1997
Low-delay techniques are proposed for coding 7 kHz speech using subband code-excited linear predictive coding (CELP). The use of separate and joint index codebooks is compared. Specifically, the joint-index-subband CELP (JISBC) algorithm is found to provide good quality with processing delay in the range 2.375 – 3.375 ms at corresponding bit rates of 16 – 8 kbit/s.