Linear system coefficient estimating method, integrated circuit, and electronic device

Abstract

A touch panel controller () capable of accurately detecting a change in capacitance includes: a driving section () which drives capacitors (Cthrough CM) in parallel in accordance with N M-dimensional vectors; and an estimating section () which obtains linear sums of the capacitors (Cthrough CM) in accordance with the driving in parallel and estimates values of the capacitors (Cthrough CM) based on an inner product operation carried out with respect to (i) the linear sums of the capacitors (Cthrough CM) and (ii) the N M-dimensional vectors, the driving section () driving the capacitors (Cthrough CM) in parallel in a first order of the N M-dimensional vectors, the estimating section () estimating a first estimated value of the capacitors (Cthrough CM) in accordance with the driving in parallel in the first order, the driving section () driving the capacitors (Cthrough CM) in parallel in a second order of the N M-dimensional vectors, the estimating section () estimating a second estimated value of the capacitors (Cthrough CM) in accordance with the driving in parallel in the second order, and the touch panel controller () further including an averaging section () estimating the values of the capacitors (Cthrough CM) by averaging the first estimated value and the second estimated value.