Abstract: An analog to digital converter circuit included in a meter ECU detects an output voltage of a potentiometer and a source voltage outputted from a battery, and converts them to different pieces of digital data. It also detects reference voltages outputted from adjustment resistors and an adjustment battery, and converts them to different pieces of digital data. It then calculates digital data on a corrected sensor output by correcting a detection error associated with a jumper line and a voltage variation in the source voltage based on the digital data.

Abstract: A method for analog-to-digital conversion of an analog signal includes decomposing the signal in the time domain into intervals, and transforming these intervals one after another using orthogonal functions, the coefficients corresponding to the orthogonal functions being defined and digitized. The transformed signal is then inversely transformed in the digital domain using the digitized coefficients and the same or different orthogonal functions. A high level of performance with respect to bandwidth and resolution may be achieved.