| 摘要 |
PURPOSE:To improve the quality of processing sounds at the noise suppressing device to suppress a noise component from an acoustic signal mixing constant noise into a required signal. CONSTITUTION:A Wiener filter estimating means 8 estimates a Wiener filter transmission function from the estimated values of an input signal power spectrum and a noise power spectrum, a filter transmission function correcting means 9 sets the value of the frequency component of the Wiener filter transmission function smaller than a threshold value equally to the threshold value so as to prevent a signal component from being missed by adding/subtracting the noise component, an impulse response control means 11 provides a time constant in an impulse response intermittently outputted from an inverse FFT 10 for every (m) sample cycles so as to prevent foreign sounds from being generated in the processing sounds by continuous changes for every samples, and a high frequency emphasizing means 3 is provided in the preceding step of the FFT 5 so as to improve accuracy for calculating a high frequency band when calculating the fixed decimal of a finite word length. |
