Multimode speech encoder and decoder apparatuses

摘要

The present invention relates to a low bit rate speech coding apparatus which performs coding on a speech signal for transmission, for example, in a mobile communication system. Excitation information is coded in multimode using both static and dynamic characteristics of quantized vocal tract parameters. Decoding includes postprocessing in multimode, thereby improving the quality of both unvoiced speech regions and stationary noise regions of the transmitted speech signal.