| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the useless current consumption when the number of held conferences is smaller than the largest number of conferences by inputting the voice data to a voice processing means corresponding to the registered conference to be held and supplying an operation clock signal to the voice processing means to drive this means. SOLUTION: An input circuit 1 expands the digital input voice data based on the effective circuit information 11 that is received from a private branch exchange control part 10 and outputs these voice data as the linear voice data 211 to 214. A clock distribution circuit 4 decides an (N-1) addition circuit to be operated based on the conference number data 41 which are received from the part 10 and supplies an operation clock to the circuit. The circuit 4 cuts the supply of the operation clock to the (N-1) addition circuit that is not used since no conference is held. Thus, the unnecessary (N-1) circuit is kept in an inactive state and consumes no current. As a result, the useless current consumption can be prevented.</p> |
