| 摘要 |
PURPOSE:To prevent the increase in an operating time of the receiver by implementing BCH code check after establishment of synchronization so as to avoid mis-discrimination due to noise thereby eliminating an Sc (frame synchronizing signal) search mode. CONSTITUTION:When bit synchronization and midway synchronization are not established in the preamble search mode, it is discriminated that the signal is not a signal addressed to the receiver and the preamble search is continued. When the synchronization is established, '1' is set to a register (t) of a control section 204, 32-bits in a received signal are extracted and whether or not the signal in the 32-bits is a preamble signal is discriminated. When the signal is not the preamble signal, whether or not the signal is a BC code is discriminated, and when the signal is not the BCH code, the register (t) is incremented, new 32-bits obtained by shifting the received signal by one bit are read, and whether or not the signal in the 32-bits is a preamble or a BCH code is discriminated. When the content of the register exceeds 32, since the signal is discriminate to have no address signal, the mode is transited to the preamble search mode. |
