| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure a frequency in a short time by a simple device. <P>SOLUTION: A micro wave reflected by a moving body to be measured is converted into an electric signal. Subsequently, using a first output circuit 13, an electric signal generated by amplifying the electric signal is converted into a DC signal SD13 of a voltage level corresponding to the attenuation characteristic of a high pass filter composing the first output circuit 13. At the same time, using a second output circuit 14, the electric signal is converted into a DC signal SD14 of a voltage level corresponding to the attenuation characteristic of a low pass filter composing the second output circuit 14. Then, using the value of the DC signal SD13 and the value of the DC signal SD14, a frequency of the electric signal is calculated. <P>COPYRIGHT: (C)2012,JPO&INPIT |
