| 摘要 |
PURPOSE:To suppress impulsive sound inputted in a hearing aid, etc., by detecting impulsive sound, switching a switch and outputting delay impulsive sound via an LPF (low pass filter). CONSTITUTION:The instantaneous value of an input signal 210 or the instantaneous value after the only high frequency components of the signal 210 are filtered exceeds a threshold, impulsive sound is detected by an impulsive sound detection means 230 and the switch 72 of an impulsive sound suppression circuit 710 is switched by a temporary holding circuit 250. A delay input signal through a delay circuit 280 is outputted via an LPF (low pass filter) 730 and impulsive sound inputted in a hearing aid, etc., is suppressed. |
