SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND COMPUTER PROGRAM

摘要

[Problem] To achieve high-quality signal processing by preserving important signal components. [Solution] A signal processing device (100) is provided with: a suppressing unit (103) that processes a mixed signal comprising a first signal and a second signal to suppress the second signal; a delay unit (104) that generates past suppression results by delaying the suppression results from the suppressing unit; an analysis unit (101) that analyzes the importance of each frequency component of the first signal contained in the mixed signal by referencing the past suppression results; and a suppression limiting unit (102) that references the past suppression results and the results of the analysis carried out by the analysis unit in order to limit the suppression of the second signal with respect to the important frequency components more than the unimportant frequency components.