Patent ID: 7592942

Claim:
An A/D conversion processing circuit comprising: a switch which selects an input from each of multiple systems, and which, if a system of a selected input has multiple inputs, sequentially switches over the multiple inputs to select each of the multiple inputs, and if a system of a selected input has a single input, fixedly selects the single input; an A/D converter which converts an output of the switch to a digital signal, the A/D converter obtaining the digital signal by performing sampling with a sampling frequency according to a necessary signal bandwidth; a separation section which separates signals included in an output of the A/D converter; an interpolation section which performs on each signal from the separation section an interpolation processing according to a deviation in sampling timing in the A/D converter, to obtain a signal where the multiple inputs are digitally converted at the same sampling timing; and an output section which outputs as-is an output of the A/D converter if a signal of the single input is inputted to the A/D converter from the switch.