Signal processing apparatus and method for controlling signal processing apparatus

A signal processing device according to the present invention is provided with: a filter circuit configured so as to have a first capacitor and configured so as to reduce a predetermined frequency component of an analog signal; a sample-and-hold circuit configured to have a second capacitor and sample-and-hold the analog signal that has passed through the filter circuit; and an AD conversion circuit that converts an output signal of the sample-and-hold circuit into a digital signal, applies a predetermined voltage to the second capacitor to charge the second capacitor, and then causes the sample-and-hold circuit to sample the analog signal that has passed through the filter circuit. Thus, the time for charging the first capacitor is suppressed, and the error of the digital signal is reduced. 本申请的发明所涉及的信号处理装置及其控制方法，具备：滤波器电路，具有第1电容器而构成，使模拟信号的规定频率成分降低；采样保持电路，具有第2电容器而构成，对经过了所述滤波器电路的所述模拟信号进行采样保持；以及AD转换电路，将所述采样保持电路的输出信号转换为数字信号，在对所述第2电容器施加规定电压来对所述第2电容器充电电荷后，使所述采样保持电路对经过了所述滤波器电路的所述模拟信号进行采样。由此，抑制对第1电容器充电电荷的时间，降低数字信号的误