| 摘要 |
PURPOSE:To talk among three or more subscribers at a low cost, by providing a switch control memory which is able to designate simultaneously plural readout addresses of the time switch, on the time division switchboard. CONSTITUTION:The sound signals of subscribers A-C pass through the subscriber's circuits 5-7 of the switchboard, respectively, are converted to digital PCM codes by the converting circuits 8-9, and are made multiple by the multiple circuit 11. The multiple codes a-c provide the address information generated in order by the counter circuit 13, to the time switch 12 through the address selective circuit 15, and are stored in order in the addresses A'-C' of the switch 12. The switch 12 is read out by the switch control memory 14. Each word of the memory 14 has the bit length of two times, the information (b), (c) of the addresses B', C' of the switch 12 is read out at the same time by the time slot A', and is set to the register circuits 16, 17, respectively. The contents of the circuits 16, 17 are compounded by the digital compounding circuit 18, and are transmitted to the subscriber A through the multiple separating circuit 19. In the same way, the digital sound codes of subscribers A, C are transmitted to the subscriber B. |
