| 摘要 |
<p>PURPOSE:To exactly synchronise a code phase even when noise is generated on a transmission line or the like by detecting the output of a filter means at each code phase changed by a code phase changing means and setting the phase of a code generating means to the state of making the output maximum corresponding to a detecting signal from a one-cycle detecting means. CONSTITUTION:A first counter 30 outputs a pulse at the same interval as the cycle of a code, and a second counter 31 reads an initial count value from a control circuit 25 corresponding to the output pulse of the first counter 30, starts counting from this value and outputs a pulse when the count value becomes zero. By successively changing the initial count value supplied from the control part 25 to the second counter 31, the phase of the code is changed for each chip over one cycle of the code. On the other hand, a correlation output in each phase state is calculated, and the phase state of the maximum correlation output is stored. After calculating the correlation concerning entire one cycle of the code, the code phase is set to the stored phase state, and the initial phase detecting operation is finished.</p> |
