| 摘要 |
<p>The minimum value detecting circuit detects a minimum value, excluding zero, of a coefficient according to a dequantized acoustic signal. The correction coefficient computing circuit computes a correction coefficient based on the minimum value and white noise outputted from the white noise storage which stores white noise. In this process, a correction coefficient is computed by, for example, dividing the minimum value obtained by the minimum value detecting circuit by a value which is twice the maximum value or the mean value of white noise stored in the white noise storage. The correction value computing circuit computes a correction value by multiplying the correction coefficient computed by the correction coefficient computing circuit by white noise stored in the white noise storage. A corrected coefficient is computed by adding the correction value obtained as described above to a frequency band having a null coefficient according to a dequantized acoustic signal.</p> |
