| 摘要 |
PURPOSE:To simplify the circuit constitution, by reducing the amount of multiplication required and making small the scale of hardware, through the use of the symmetry of the coefficient of the numerator of the transfer function. CONSTITUTION:YN-1-i(ZN) is inputted from the input terminal 100, Yi-1(ZN) is inputted from the input terminal 200, and Ci(ZN) as shown in equation (11) is outputted from the output terminal 300. By this output, since the absolute value of the coefficient of the numerator of the real band filter Gi.O(-Z<2>N) and GN-1,i(-Z<2>N) has symmetry, the multipliers 31, 32 and 33 can commonly be used. When the input of the input terminal 200 is zeroed, the transfer function from the input terminal 100 to the output terminal 300 is G'i.O(-Z<2>N). When the input at the input terminal 100 is zeroed, the transfer function from the input terminal 200 to the output terminal 300 is Z<->NG'N-i,O(-Z<2>N). Thus, the number of multiplications for the numerator of the two real band filters can be equal to the number of multiplications of the numerator of the one real band filter. |
