| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reflection sound adding device which provides voice which maintains sound quality and clearness with presence feeling, even when an input voice signal level transitionally changes. <P>SOLUTION: The reflection sound adding device comprises: an input voice level value calculation means 212 for calculating an input voice level value for each predetermined period from a frequency component extracted from an input voice signal which is input from outside; an upper limit level value determination means 221 for holding a maximum value in the input voice level value of the past, as the upper limit value level; a lower limit level value determination means 222 for holding a minimum value in the input voice level value of the past, as the lower limit value level; a threshold value calculating means 223 for calculating a rising threshold value and a falling threshold value from the upper limit level value and the lower limit level value; a parameter setting means 23 for calculating a reflection sound volume which is added to the input voice signal, from the input voice level value, the rising threshold value and the falling threshold value; and a reflection sound processing means 30 for adding the calculated reflection sound volume to the input voice signal. <P>COPYRIGHT: (C)2008,JPO&INPIT |
