| 摘要 |
PURPOSE:To enable signal distribution with economy and flexibility, by storing a signal distributed to a plurality of subscribers commonly to a specific area of a channel memory. CONSTITUTION:The number of words of a channel memory DSPM is provided for m+1 words for number of subscribers m, and a status bit S is added to the word length. The subscriber information and logical value ''1'' when calling, are written in each channel corresponding section of a storage memory CM and logical value ''0'' is written in to subscribers who listen to tone, e.g., TSb. The tone signal transmitted from a central device is transmitted by using one channel (TSr) not used for the calling. The information of a virtual subscriber TSd is written in to a storage memory CM for it. When a signal is written in to a DSPM from a transmission line dl, a signal is written in the specific area m+1 address of the DSPM to the channel of the TSd. |
