| 摘要 |
<p>PURPOSE:To assign a coding speed that ensures the high voice quality to some voice channels and to attain the transmission of these channels by deciding a specific telephone No end changing automatically the voice coding speed to the decided telephone No. CONSTITUTION:For instance, a coding speed of l6kb/s is assigned to eight voice channels A and these channels are operated at a data bit rate l28kb/s in all. Then a PBX l confirms a call transmitted by a specific telephone No set previously and sends a control signal to a control part 21 of a multiplexing device 2. The part 21 sets a voice channel B to a 32k/l6k conversion part 22 against the specific telephone No. Thus a coding speed of 32kb/s is assigned to the channel B designated to the specific telephone No. Thus the quality is improved for the transmitted voices.</p> |
