Neural network device

Claim 1

A neural network device comprising: input means for performing predetermined processing of external input information and, generating and outputting an input signal; arithmetic processing means for performing an arithmetic operation of said input signal in accordance with a plurality of control parameters and generating an output signal; and control means for controlling a control parameter of said arithmetic processing means so that the output signal is set to satisfy a predetermined relationship with said input signal, said control means including first cumulative summation means for cumulatively summarizing updating amounts of control parameters updated on the basis of a plurality of teacher signals supplied as an input signal during learning and for cumulatively summarizing said updating amounts of control parameters according to a sign assigned to the updating amount of each control parameter value, and second cumulative summation means for adding currently used control parameter values to values obtained by said first cumulative summation means to obtain new control parameter values, wherein said first cumulative summation means includes a first comparator for comparing said input signal outputted from said input means with a reference signal to determined a sign and outputting a first decision signal, and a first adder for sequentially adding said first decision signal and outputting a first sum signal at a predetermined timing, and said second cumulative summation means includes a second comparator for comparing said first sum signal with a reference value to determine a sign of the sum signal and outputting a second decision signal, switch means, turn on/off at a predetermined timing, for controlling an input timing of said second decision signal to a second adder, and said second adder for performing a predetermined addition in accordance with the second decision signal and outputting a second sum signal.