Fuente: Wipo "digitalization" A signal processing apparatus and a method are disclosed, in which the signal processing apparatus may convert an analog signal to a digital signal and store the digital signal. The signal processing apparatus may convert analog signals, transmitted by multiple analog channels, to digital signals using analog-to-digital converters (ADCs), hold the digital signals for a predetermined holding time, sequentially read the held digital signals for each digital channel, and store the sequentially read digital signals.