| 摘要 |
<p>PURPOSE:To speedily perform the initial synchronizing matching by developing a diffusion code on the frequency axis by using the discrete data, which is decided by each digit value, of the diffusion code allocated with the phase of each frequency component or the displacement from the central frequency previously stored in a memory. CONSTITUTION:A clock source 102 and an address clock reproduction circuit 114 generate addresses by supplying the address clock having frequency more than double that of signal data to address generation circuits 103 and 115. Memories 104 and 116 store the discrete data, decided by each digit value, of the diffusion code allocated with the displacement from the central frequency of each frequency component to output the data. A transmitter-receiver is constructed of D/A converters 105 and 117, a demodulator 113, a mixer, LPF, and BPF or the like through a transmission line 109. Thus, diffusion codes are developed on the frequency axis using the discrete data and the initial synchronizing matching can speedily be performed without providing a synchronization acquisition circuit.</p> |
