| 摘要 |
PURPOSE:To reduce greatly variable coefficients in number by separating variable coefficients, corresponding to the center frequency and band width of a passing band, from multipliers determining the basic characteristics of a filter. CONSTITUTION:An input signal of sampling period T from input terminal 21 is added to the output of adder 23 by adder 22. The output of adder 22 is supplied to block 24 and also to adder 26 via multiplier 25 of (a0) in multiplier. The output of block 24 is multiplied by variable multiplier 1/B0 by variable multiplier 27 and the multiplication output is supplied to multiplier 28 of (-b1) in multiplier, block 29 and multiplier 31 of (a1) respectively. The output of block 29 is multiplied by variable multiplier 1/B0 by variable multiplier 32 and then supplied to multiplers 33 of (-b2) and multiplier 34 of (a2). The outputs of them are applied to adders 22, 23 and 35 and the output of adder 26 is supplied to output terminal 36. |
