Analog to digital converter and signal processing system

A signal processing system, comprising:

• an analog to digital converter adapted to convert an analog signal from an analog signal processing system,
• said analog to digital converter including
• an analog to digital conversion stage of at least one stage adapted to produce digital data of a value corresponding to a relationship to two analog signals inputted thereto and output two analog residual signals,
• said analog to digital conversion stage including
• a signal production section adapted to receive, as input signals thereto, a first analog signal of a voltage value corresponding to a difference between a voltage value between a first reference voltage, and a second reference voltage and the second reference voltage and a second analog signal of a voltage value corresponding to a difference between a voltage value of the first analog signal and a difference voltage between the first reference voltage and the second reference voltage, produce at least one third analog signal of an intermediate voltage value produced from the voltage value of the first analog signal and a voltage value of the second analog signal, and output the first analog signal, second analog signal and third analog signal,
• a comparison section adapted to receive, as input signals thereto, the first analog signal and the second analog signal, compare the voltage value of the first analog signal and the voltage value of the second analog signal with each other, and output digital data of a value corresponding to a result of the comparison,
• a first outputting section adapted to amplify a first residual signal with a predetermined amplification factor and output the amplified first residual signal,
• a second outputting section adapted to amplify a second residual signal with the predetermined amplification factor and output the amplified second residual signal, and
• a changeover section adapted to change over inputting of the first analog signal, second analog signal and third analog signal outputted from said signal production section to said first outputting section and said second outputting section in response to the result of the comparison by said comparison section,
• said comparison section outputting first digital data when a first comparison result that the voltage value of the first analog signal is lower than the voltage value of the second analog signal is obtained whereas said comparison section outputs second digital data when a second comparison result that the voltage value of the first analog signal is higher than the voltage value of the second analog signal is obtained,
• said changeover section carrying out the changeover such that,
• when the first comparison result is obtained by said comparison section, the first analog signal outputted from said signal production section is inputted as the first residual signal to said first outputting section and the third analog signal outputted from said signal production section is inputted as the second residual signal to said second outputting section, but
• when the second comparison result is obtained by said comparison section, the third analog signal outputted from said signal production section is inputted as the first residual signal to said first outputting section and the second analog signal outputted from said signal production section is inputted as the second residual signal to said second outputting section.