| 摘要 |
<p>A plurality of digital filters, each operating at mutually different clock frequencies (fc1,fc2), are cascaded to each other in a digital filter circuit. The clock frequencies are set so that the least common multiple thereof is equal to a high frequency at and above which the high-frequency component of a signal to be filtered by the digital filter circuit barely exists. By setting the clock frequencies in this manner, the second frequency pass band of the digital filter circuit can be raised to a high frequency so as to approximate the total filtering property of the digital filter circuit to that of a desired low-pass filtering property.</p> |
