PROBLEM TO BE SOLVED: To provide an improved automatic keyer without requiring the confirmation of the voice range of a singer at a low cost. ;SOLUTION: The main pitch of a singer or a user is measured for a prescribed period (28), and the pitch of the singer or the user is compared with a reference pitch (29), and a signal showing noncoindence is imparted, and the pitch of background music is changed so as to coincide with the same of the singer or the user (31).;COPYRIGHT: (C)1997,JPO
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