| 摘要 |
PURPOSE:To prevent disturbance of talking due to crosstalk and leakage of contents of talking by providing a coder digitizing a transmission signal provided to each transmission system comprising a master set and slave sets and a scrambler ciphering the output of the said coder according to a specific rule. CONSTITUTION:Communication by electromagnetic waves f1, f3 is finished depending on outgoing by an operation display section ODP38 or an incoming from a line 1 and talking by a TKC28 is attained freely. Further, a reception signal RS as a transmission signal from the master set 01 and a transmission signal TS as a transmission signal from a slave set 02 are digitized respectively by coders COD4, 31 inserted to the transmission system including modulators MOD7, 34 and high-frequency power amplifiers TPA8, 35. The signals are transmitted while being ciphered by scramblers SCRs 5, 32 provided similarly. The reception is disabled in other similar device so long as the restoration and decoding operations corresponding to the above ciphering are not executed. |
