| 摘要 |
PURPOSE:To obtain a radio telephone set capable of privacy talking as required. CONSTITUTION:The system consists of a master set 33 connecting to a wired line 31, plural master sets 35-1 to 35-m connecting to the wired line 3 via the master set by connection control of the master set and plural salve sets 36-1 to 36-m connecting to the master set via a radio line and the master set and the slave sets each is provided with a voice ciphering circuit. Then each slave set is provided with a means to control the operation and operation stop of the voice ciphering circuit.
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