| 摘要 |
PURPOSE:To minimize the reception of noise by a slave station to the utmost by forming a signal sent from a master station with a calling data of the slave set and a dummy data and sending the dummy data when no transmission data is sent. CONSTITUTION:A transmission signal consists of a dummy data and a calling data 2, and the calling data 2 consists of a preamble for informing transmission of data, a synchronization code and frames with data stored in them. While no calling data 2 is sent, the dummy data 1 is always sent. The received signal is either the calling data 2 or the dummy data 1 and the reception of noise when no transmission signal exists is avoided, then a squelch circuit having been required for a conventional system is not needed. |
