| 摘要 |
<p>The sound quality of inputted signals is changed in accordance with the sense of hearing. The differences of magnitudes of an attribute between frequency components approximately in a critical band are based on auditory characteristics. The frequency components are obtained from acoustic time signal information. The characteristic of this acoustic time signal information is changed by one of the following techniques: (1) the differences of magnitudes of an attribute between frequency components above the threshold of audibility or masking threshold level among the frequency components are changed; (2) the differences of magnitudes of an attribute between frequency components above the higher one of the two thresholds are changed; (3) the differences of magnitudes of an attribute between frequency components in a limited range of level are changed; and the differences of magnitudes of an attribute between frequency components in the approximately critical band obtained from acoustic time signal information having a frequency resolution and a time resolution and containing at least two different frequency components are changed. In such a way, the harmonic relationship between the frequency components in the critical band which is audibly supported is controlled, thus making it possible to adjust the sound quality of speech and acoustic signals to the level useful to a human being.</p> |
