| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise suppression device capable of achieving high suppression accuracy.SOLUTION: This noise suppression device suppresses a noise component for each frequency band signal obtained by analyzing the frequency of an input signal. A noise suppression part for each band includes a power calculation part for calculating power for the frequency band signal, a first voice detection part for comparing the calculated power with a first threshold value generated by using the first smoothed value of the calculated power, and a second voice detection part for comparing the calculated power with a second threshold value generated by using the second smoothed value of the calculated power. The first voice detection part executes smoothing when the detection result of the second voice detection part before one unit time is a noise section, and stops the smoothing to obtain a first smoothed value when it is a voice section. The second voice detection part executes smoothing when the detection result of the first voice detection part before the same unit time is a voice section, and stops the smoothing to obtain a second smoothed value when it is a noise section. The first smoothed value is set as a signal after noise suppression for each band.SELECTED DRAWING: Figure 1 |
