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|1. (WO2018142770) SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND COMPUTER PROGRAM|
|Title:||SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND COMPUTER PROGRAM|
[Problem] To provide a signal processing device capable of suppressing external noise without degrading audio characteristics. [Solution] Provided is a signal processing device comprising: an A/D converter that includes a first delta sigma modulator for performing first delta sigma modulation processing on an input analog signal and outputs a digital signal with a predetermined sampling frequency and quantization bit number a; a filter unit that subjects the output of the A/D converter to digital filtering with a predetermined filter characteristic and outputs a digital signal with a predetermined sampling frequency and quantization bit number b; a second delta sigma modulator that performs second delta sigma modulation processing on the output of the filter unit and outputs a digital signal with the predetermined sampling frequency and quantization bit number a; and an adder that adds the output of the second delta sigma modulator and the input digital signal of the sampling frequency and the quantization bit number a.