| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a magnetic detection device which is capable of reducing an influence of aliasing noise on an output signal of a magnetic sensor driven by a current pulse having a repetition frequency.SOLUTION: A magnetic detection device 10 includes a magnetic sensor 12 driven by a current pulse having a repetition frequency and a detection circuit part 20 for processing an output signal from the magnetic sensor 12. The detection circuit part 20 includes an averaging processing part 30 which, if noise at a repetition frequency fsample and its neighbors becomes an aliasing frequency in accordance with Shannon's sampling theorem and becomes noise at a frequency lower than the repetition frequency, provides an averaging section within a period of the repetition frequency so as to reduce the amplitude of the noise at the lower frequency to a half or smaller and performs averaging processing in the averaging section.</p> |
