| 摘要 |
PURPOSE:To obtain an error signal detector attaining measurement with high accuracy stably even at the time of measurement by a signal having a large frequency change without deteriorating accuracy at the time of measurement by a signal having stable frequency, and obtain a Doppler speedometer using the error signal detector. CONSTITUTION:A level detector 126 detects the signal level of an input signal. The signal level is compared with a reference level and a level signal is output, and a periodic error detector 125 detects the periodic error of the input signal and outputs a periodic error signal. An error-signal decision circuit decides an error signal on the basis of an output from the level detector 126 and an output from the periodic error detector 125, and outputs the error detecting signal of the input signal. |
