| 摘要 |
<p>A digital zero-IF selectivity section circuit which operates on a recovered input signal (12), digitally clocked by a first clock (22) at a rate of FS, in receiver device. The circuit uses a second clock (24) operating at a lesser rate than the first clock (22) to clock an N-order FIR digital filtering means (16) to selectively band-limit the frequency spectrum of the recovered input signal (12). A second digital filtering means (20, 28) is coupled to the output of the first FIR digital filtering means (16). The second digital filtering means (20, 28) operates at a clock speed less than or equal to the second clock speed. The second digital filtering means (20, 28) is used to further selectively band-limit the frequency spectrum of the recovered input signal (12).</p> |
