Patent ID: 6862260

Claim:
A correction method being adapted to use a normalization circuit, including: two input lines to which two signals are respectively input; an addition section which adds offset signals to the two signals which have been respectively input to the two input lines; a calculation section which divides the difference between the two signals to which the offset signals have been added in the addition section, by the sum of the two signals, to thereby perform normalization; and an output line which outputs a signal representing the result of the normalization which has been obtained through the calculation section, and to adjust the values of the offset signals of the normalization circuit to thereby correct the error of the normalization circuit, comprising: a same-signal pair input step respectively inputting to the two input lines two signals of a same-signal pair that consists of the two signals each having the same signal waveform; and a difference-adjusting step adjusting the difference between the values of the two offset signals in the addition section to thereby make the value of the signal output from the output line of the normalization circuit, the two input lines thereof having input thereto the two signals of the same-signal pair, fixed or coincide with a predetermined value.