| 摘要 |
PURPOSE:To eliminate malfunction by A/D-converting a correlation spike, detecting the absolute value of the spike, generating a threshold value signal based on the peak value of the absolute value, and generating a correlation pulse by comparing the threshold value signal with the absolute value. CONSTITUTION:The title circuit is constituted of a correlator 1, an A/D conversion circuit 2, an inversion circuit 3, a selection circuit 4, a peak hold circuit 5, a latch circuit 6, a threshold value setting circuit 7, a comparator 8, a peak value detection circuit 9 consisting of the peak hold circuit 5 and the latch circuit 6, and an absolute value detection circuit 10 consisting of the inversion circuit 3 and the selection circuit 4. And the correlation spike can be obtained by taking the correlation of a reception signal with a reference signal by the correlator 1, and the value of the correlation spike is A/D-converted, and the absolute value of the spike is detected, and the threshold value signal is generated based on the maximum value of the absolute value, and it is compared with the absolute value, then, the correlation pulse corresponding to the correlation spike is outputted. In such a way. it is possible to eliminate the malfunction in the case of changing the polarity of the correlation spike. |
