Design of a toll-quality 4-kbit/s speech coder based on phase-adaptive PSI-CELP

This paper describes the design of a toll-quality 4-kbit/s speech coder based on phase-adaptive PSI-CELP. This adaptation method not only gives pitch periodicity to the random excitation but also synchronizes the basic point of the stored random vector with the pitch phase. We further improve the proposed coder by introducing a backward gain prediction scheme. In subjective evaluation experiment, there is no signi cant di erence between the quality of ITU-T G.726 32-kbit/s coder and that of the proposed 4-kbit/s coder under the conditions of normal and low input levels, tandem connection for clean speech. In noisy environment, there are also no signi cant di erences between G.726 and 4-kbit/s coders from MOS results of ACR test.