| 摘要 |
PURPOSE:To enable to reduce joint noise to the utmost by the use of digital filters by sending 2 kinds of output of the phase comparator to digital filters and applying other 2 kinds of output to the 1st selector. CONSTITUTION:The output of digital filter 310 is sent directly to 2-1 selector 340 through delay circuit 330, the output of digital filter 320 and selector 340 is sent to 2-1 selector 350 and the output of selector 350 is supplied to FF 360. Two kinds out of 4 kinds of output of phase comparator 370 enter into filters 310 and 320 and control the coefficients of both filters. Other 2 kinds of output are entered to selectors 340 and 350 and are controlled so that any one of 2 input signals can be outputted; FF whose input is the output of selector 350 is operated by the stated sampling frequency. Thus, joint noise can be reduced to the utmost by the use of digital filters. |
