JPS55109024A - Digital filter - Google Patents

Abstract

PURPOSE:To realize the high-speed processing of the digital filter by combining the sequential memory access system and the access system with the specific pattern of the data used as the address in terms of the sample value which is delayed through the non-circulation digital filter. CONSTITUTION:The input is supplied to shift register 2 through serial-parallel converter circuit 1, and data xn... of the L bit length are supplied in sequence to N units of elements of register 2. And each element data of register 2 are extracted in the form of groups 1, 2 and so on, and the process within the group is carried out in the pattern address system. For the processes among the groups, the shift is given to the data of each element via counter 22 to the group selected by selector 21. And the group identification signal is applied to ROM21 along with the M bit of the selected group and with every circulation of the groups. The addition with every digit is given via the loop of register 9, adder circuit 10 and register 11 each for each group read out of ROM12, and the addition is given with every digit among the groups of the subsequent steps and via registers 23-divider 26. Thus the final output is obtained.