| 摘要 |
PURPOSE:To make the switching control line of a relay regulated and simplyfied to make a circuit scale small-sized by using the channel pulse of an encoder/a decoder to control the relay circuit of a subscriber circuit as a matrix. CONSTITUTION:Relay circuits 6.11-6.nm connected to the encoder/decoders 5.1- 5.n take in information ''0'' or ''1'' of bits corresponding to specific time slots in one frame synchronously with the PCM audio data highway of said encoder/decoders on a basis of serial data C (125mus period) of switching information of relays 7.11-7.nm of these m-number of relay circuits 6.11-6.nm in m-number of bits of one-channel time slots by data E1-Em having one time slot as the period and clock enable signals D1-Dn which make only clocks of specific time slots in one frame effective, and relay circuits 6.11-6.nm hold taken-in information till the next frame. Consequently, the information ''0'' and ''1'' are allowed to correspond to the opening and closing of relays to switch the relays really. |
