| 摘要 |
<p>An automatic gain control (AGC) circuit comprising a first filter (33) to which a received signal (SR ) is applied, a variable level adjusting means (34), connected therewith, for producing the automatic gain controlled signal. A feedback loop is set up between the input and output of the variable level adjusting means (34), which feedback loop contains therein a second filter (51) exhibiting a narrower equivalent noise band width than that of the first filter (33), in response to a-particular signal component having a predetermined frequency spectrum with a certain duration so as to perform an integration in the second-filter (5).</p> |
