NONCYCLIC TYPE DIGITAL FILTER

PURPOSE:To set the transfer function of the (n)-th block to a prescribed value and to reduce the noise of a filter output, by providing the (0)-th-(M-1)th blocks which are connected in parallel with each other and (M) pieces multipliers which multiply the (n)-th output by 1/Kn. CONSTITUTION:The noncyclic digital filter of this invention is composed of (M) pieces blocks of filters which are connected in parallel with each other, (M) pieces of multipliers 13 which respectively multiply outputs of the (M) pieces of blocks by 1/K0-1/KM-1, and an adder 14 which adds outputs of the multipliers 13 to each other. Each block is constituted of N/M-1 pieces of delay elements 11 of a delay time MT, N/M pieces of multipliers 12, and N/M-1 pieces of adders 14. By setting the transfer function of the (n)-th block of this filter to the one expressed by the equation I, noises from an output terminal 5 resulting from the quantized noise produced by the output of the multipliers 13 of this filter are reduced.