Device for converting analog signal into digital values and correcting the values

An analog to digital converting device comprising:

• a first analog to digital converter that can convert an analog level of an input signal into a first digital value every first sampling period of time shorter than a second sampling period of time;
• a second analog to digital converter that can convert the analog level of the input signal into a second digital value every second sampling period such that the second digital value indicates the analog level with a precision higher than a precision of the first digital value indicating the analog level;
• a correction equation determining unit that determines a correction equation by using the second digital value each time the second digital value is obtained in the second analog to digital converter;
• and
• a correcting unit that corrects each of the first digital values, obtained in the first analog to digital converter in one second sampling period, to a corrected digital value according to the correction equation, determined by the correction equation determining unit by using the second digital value obtained in the second sampling period, every second sampling period and outputs the corrected digital values as digital values determined from the input signal.