| 摘要 |
PURPOSE:To obtain a sound of high sound quality that people comfortably hear by converting characteristics of acoustic time signal information by varying a difference in the attitude value of a specific frequency component from other frequency components almost in a critical band. CONSTITUTION:Band-division filters 2-4 and modified DCT(MDCT) circuits 5a-5d as a converting means convert the acoustic time signal information into plural frequency components. Then a frequency component varying circuit 6, a mask circuit 10, a frequency shift peak detecting circuit 12, a dissonant frequency component detecting circuit 11, asking threshold curve detecting 16, and a minimum audible curve generating circuit 17 as an attribute varying means vary the difference in the attribute value of the frequency component, obtained from the acoustic time signal information that frequency components at least two places have different frequency resolution and time resolution among plural frequency components obtained from the converting means, from other frequency components almost in the critical band. |
