parallel processing according to a second embodiment of the present invention and fig1 is a view showing an example of the input output signals in fig9 according to the second embodiment a feed forward method is used so that the number of input signals is not limited for simplicity of demonstration an example in which the number n of input signals is 4 will be described below the precoder 900 shown in fig9 includes a judgment unit 910 a toggle unit 920 an output unit 930 and a clock signal clk referring to fig9 and 10 the judgment unit 910 judges whether an odd number or even number of u2018 0 u2019 s exists in n number of input signals inputted at an n th time of signal input for instance in the case in which the number n of the input signals is even the judgment unit 910 outputs u2018 0 u2019 when the total number of u2018 1 u2019 s in the n number of input signals is even on the other hand the judgment unit 910 outputs u2018 1 u2019 when the total number of u2018 1 u2019 s in the n number of input signals is odd fig1 shows an example of the signals as described.