Study of Speech Signal Processing Applied to Digital Intercom

With the development of social economy and technology,the analog intercom could not satisfy the market demand.Nowadays,the Chinese researchers focus on the development of independent digital intercom and its protocol.By comparing the speech qualities composed by LPC,SELP,MBE and MELP,the application of MELP in the digital intercom is proposed.and the simulation and experiment with Matlab indicate that this scheme is feasible and could satisfy the requirement of digital intercom.