| 摘要 |
PURPOSE:To contrive the improvement of arithmetic speed and to reduce a circuit scale by providing a basic digital filter to each of bit signals and placing the object of filter processing onto one bit data so as to constitute the titled circuit by an FIR type filter. CONSTITUTION:In M-set of basic digital filters 10-11-M, filtering is processed to each of m-order of bit signals of a data signal in M-bit binary representation, a processing result data comprising a prescribed bit number is sent to corresponding weight circuits 20-2M-1 to apply the weighting of 2<m> and sent to an adder. Then the adder takes the sum of outputs of M-set of weighting circuits and gives an output. Since the object of filtering processing of the basic digital filter is one-bit data, in constituting the filter by a definite impulse response (FIR) type filter, the circuit is constituted without using a complicated multilayer, the circuit scale is reduced and the operating speed is improved.
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