| 摘要 |
PURPOSE:To attain normal operation without using a special code by providing a digital filter, a calculation circuit and a control circuit controlling the phase of sampling to a reception circuit so as to control the timing for the sampling. CONSTITUTION:A control circuit 17 in response to the result of calculation from a calculation circuit 16 changes a sampling phase tau slightly and keeps the result of calculation as a preceding calculation result. Upon the receipt of the new calculation result from the calculation circuit 16 after a change in the tau as the present calculation result from the calculation circuit 16, the control circuit 17 compares the preceding calculation result with the present calculation result to output an error between the preceding and present calculation results. The control circuit 17 controls the sampling phase tau to obtain a relation of tau=0. That is, the control circuit 17 detects the maximum power calculated by the calculation circuit 18 in various phases to control the sampling phase to be a phase keeping the maximum power. |
