Voice packet transmission device and method

摘要

PPROBLEM TO BE SOLVED: To provide a speech packet transmitting device and its method, a speech packet receiving device, and a speech packet communication device in which speech reproduction quality is improved at the border between a voiced state and a voiceless state. PSOLUTION: Generated is a speech data frame obtained by performing conversion into speech data generated by gradually increasing the level of speech data of a voiceless speech data frame before becoming voiced when an inputted speech signal 4 increases in level from a voiceless speech not lower than a specified threshold level Sth to a voiced speech larger than the threshold level Sth. Further, generated and packetized is a speech data frame generated by performing conversion into speech data generated by gradually decreasing the level of speech data of a voiceless speech data frame after becoming voiced when the speech changes from a voiced state to a voiceless state. Consequently, fade-in and fade-out processing is carried out and a speech waveform has no discontinuous part, so that no abnormal sound is generated at the transition part to reduce deterioration in speech quality. PCOPYRIGHT: (C)2005,JPO&NCIPI