CONTROL SYSTEM OF TAP COEFFICIENT

摘要

PURPOSE:To change the tap coefficient at a high speed by having a shift in every symbol block cycle between tap coefficients of the 1st and 2nd RAMs so as to give a delay to the reading or writing side of said tap coefficient. CONSTITUTION:A shift is given in every symbol clock cycle between tap coefficients of the 1st and 2nd RAM18 and 19 so as to have a delay at the reading or writing side of said tap coefficient. Then each tap coefficient is first read out of the RAM18 in the first symbol clock cycle and delivered. At the same time, the addition/subtraction is carried out by an adder/subtractor 11 for the tap coefficients. These tape coefficients are written to the RAM19. Then each tap coefficient is read out of the RAM19 in the next symbol clock cycle and delivered to be written to the RAM18 after the addition/subtraction performed through the adder/subtractor 11. Thus the operation of the first cycle is repeated in the following cycle respectively. As a result, the working speed can be substantially increased about double. Thus the tape coefficient can be changed at a high speed.