In the person to whom voice is too large while calculating the running average of amplitude level

摘要

PROBLEM TO BE SOLVED: To give an effective chance which casually makes a singer notified that a singing volume of the singer who sings according to accompaniment music is too large, without explicitly notifying the fact, and thereby, to make the singer lower his/her the singing volume in high probability without spoiling pleasure of Karaoke singing.SOLUTION: A moving average of an amplitude level of singing input from a microphone 171 is determined, and when the determined moving average is more than a reference level which is set beforehand, an output sound volume of the accompaniment music is lowered.