FIR (finite impulse response) filter with non-symmetric frequency response characteristics

摘要

The FIR (Finite Impulse Response) filter with non-symmetric frequency response characteristics; data stored in the shift register is selected by the select signal to be outputted from the multiplier. The tab coefficient stored in the tab coefficient generator is outputted through the multiplier according to 2 bit select signal to be multiplied. The multiplied to be output signal is stored in D flip-flop at the rising edge of a second clock 2. The data stored in a D flip-flop is selected by the select signal to be added in the adder. The adding result is that just one fourth of the tab number is added. Therefore, this one fourth of the adding result is to be stored in D flip-flop first in order to add the rest of three fourths in the same process. 90 DEG -transited quota Qout) can be produced storing all tabs added in this way of four steps in respective D flip-flops and adding all tabs in the adder finally.