| 摘要 |
<p>Blurring voltage frequencies are analysed, and if their spectrum contains a d.c. component, it indicates distortion due to reflections from one or several stationary reflecting objects. If the spectrum contains a.c. components with frequencies up to 5 Hz, it indicates coherent d.f. distortion by reflections from moving reflecting objects. If it contains one or several discrete spectra above 5 Hz, it indicates an incoherent disturbance by one or several third senders operating in the same frequency band. The various frequencies are separated by appropriate bandpass filters. These are followed by rectifiers, comparators and an OR coupling circuit.</p> |
